UBZ-304 Operating Manual

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Novatek-Electro UBZ-304 Universal Motor Protection Unit

This Operating Manual is intended to familiarize you with the device, the requirements for safety, operation and maintenance procedures of the universal motor protection device UBZ-304 (hereinafter referred to as the device or UBZ).

During operation and maintenance, the regulatory document requirements must be met, namely:

Regulations for Operation of Consumer Electrical Installations;
Safety Rules for Operation of Consumer Electrical Installations;
Occupational Safety when in Operation of Electrical Installations.

Installation, adjustment and maintenance of the device must be performed by qualified personnel having studied this Operating Manual.

In compliance with the requirements of this Operating Manual and regulations the device is safe for use.

The device meets the requirements of the following international standards:

EN 60947-1
EN 60947-6-2
EN 55011
EN 61000-4-2

Harmful substances in amounts exceeding maximum permissible concentrations are not available.

Abbreviations and terms

Abbreviation	Meaning
ARS	Automatic restarting
MS	Magnetic starter
PC	Personal computer
CT	Current transformer
LCD	Liquid crystal display
MNS	Minimum number of settings (it is used in phrases as MNS mode or MNS list)
Iсt	Rated current of CT (it is set when external CTs using; e.g., if CТ is of Т-0.66 300/5 type, then Iсt equals to 300A)
In	Rated current of the motor; As a rule, this value of current is indicated on the motor nameplate, but depending on the operating conditions, the different value of current can be set
S.c.	Short circuit

1. Application

1.1 General

UBZ-304 is designed for protection of induction motors with power of 2.5 to 315 kW in case of using the external standard current transformers with 5A output current.

UBZ can be operated in networks both with insulated and dead grounded neutral.

The device is of DIN rail design version.

UBZ provides continuous monitoring of mains voltage parameters, current values of the phase (line) currents of three-phase electrical equipment for 400/415V, 50Hz, and checking the resistance values of motor insulation.

UBZ provides protection of electrical motors in case of:

low-quality network voltage (unacceptable power surges, phase failure, incorrect phase sequence and phase “coincidence”, the imbalance of phase/line voltages, the reduction in the network frequency lower than the set one and (or) the increase of network frequency higher than the set value);
mechanical overloads (symmetrical overload in phase/line currents);
the threshold crossing of the negative-sequence current;
unbalance of phase currents without overload associated with the insulation fault inside motor and/or the power cable (the comparison of current unbalance factor according to inverse sequence with voltage unbalance factor according to inverse sequence);
the torque failure on the motor shaft (“dry running” for pumps) – protection based on the minimum starting and/or operating current;
motor delayed start or rotor blocking;
extremely low isolation between the stator and the motor housing (pre-startup check);
ground fault of the stator winding during operation – ground leakage current protection;
motor thermal overload;
overheated windings (temperature of windings is determined using the motor built-in temperature transmitters or the temperature of the housing when using the external temperature transmitters).

For each type of protection, it is possible to have banning and permitting of automatic restarting (hereinafter referred to as ARS) with load.

UBZ provides for electric equipment protection by means of controlling the coil of the magnetic starter (contactor).

UBZ detects motor currents when load relay is off (when the load relay is off and functional relay is in star-delta mode). In this case, UBZ indicates the fault of external contactor starting the motor until UBZ is turned off or control of motor currents is disabled when load relay is off.

UBZ provides for electric motors control:

using analog inputs “0-20 mA” and “0-10 V”;
using remote control channels (RS-232 and RS-485 interfaces);
by buttons on the front panel of UBZ.

Communication

UBZ provides:

parameters control and transmission by RS-485 interface using MODBUS Protocol,
parameters control and transmission by RS-232 interface.

For UBZ operation with PC the program of UBZ-304/305 Control Panel can be used; it is available on the website of NOVATEK-ELECTRO Company (https://novatek-electro.com/en/software/control-panel-of-ubz-304305.html).

UBZ-304/305 Control Panel program is designed to monitor the status and collect data of the UBZ-304 device via RS-232 or RS-485 communication interfaces (MODBUS Protocol). The program allows for saving (loading) various UBZ settings, retrieving data and save them for further analysis. Data saved can be viewed in the graphs, comparing the parameters with each other.

Graphic interface of the control panel allows real-time viewing the current status of various UBZ parameters. The flexible adjustment of interface allows adapting to the needs of any user.

1.2 Changes in the Characteristics and Operation of UBZ Depending on Program Version

If the software version is 5 or less, then changes in UBZ characteristics and operation are not available.

Version 7: metering of total, active and reactive energies is added.
Version 8: integrity control of voltages and currents calibration factors is added.
Version 9: control algorithms by the engine on analog inputs are added.

1.3 Controls and Overall Dimensions

Overall dimensions of UBZ are given in Figure 1.1.

UBZ-304 Front Panel Dimensions

Figure 1.1 – Controls and Overall Dimensions of UBZ

LCD
Green LED MMSP is on when the relay is in MNS mode
Green LED Func relay is on when functional relay is on
Green LED Ｙ/△ is on when UBZ functional relay operates in star-delta mode
Blue LED EXCHANGE is on when data exchange with PC occurs
Red LED FAULT:
- when load relay is off: it is on when UBZ is in fault conditions (it flashes if after fault ARS is expected);
- when load relay is on: it flashes when the motor is in conditions of over-current or thermal overload but relay off time has not come yet
Green LED TR is on when UBZ functional relay operates in time-delay relay mode
Green LED Power relay:
- it is on when load relay is on;
- it flashes if UBZ is within hysteresis band when controlling using analog inputs
Red LED SETUP is on when UBZ is in the mode of parameters setting
Button ↑ (UP) is scrolling of displayed parameters in the parameter view mode and scrolling of the menu in the parameters setting mode
Button ↓ (DOWN) is scrolling of displayed parameters in the parameter view mode and scrolling of the menu in the parameters setting mode
Button RES/MEM/SEL is the parameters recording in the setting mode, switching over the group of displayed parameters in the view mode, reset
Button SETUP turns on the parameters setting mode

1.4 Operating Conditions

UBZ is designed for operation in the following conditions:

Ambient temperature: from minus 20 to +55°С
Atmospheric pressure: from 84 to 106.7 kPa
Relative air humidity (at temperature of +25°С): 30 … 80%

If the temperature of the device after transportation or storage is different from the temperature of the environment in which its operation is assumed, then before connecting to the mains keep the device in operation conditions for two hours (because on the device elements condensation may be available).

2. Components

Table 2.1 – Delivery Set

Description	QTY
UBZ-304	1
Differential transformer (zero sequence transformer) TP-5-45*	1
Cable for communication with PC via RS-232 (type - КС-01)	1
Temperature transmitter (types: Pt100, Ni100, Ni120)**	1
Fasteners	2
Rubber gasket	1
Operating manual	1
Packing	1

* Current transformers, “Novatek-Electro” production: ТР-7-5-100, ТР-7-5-120, ТР-7-5-150 and other, is delivered upon agreement with the Customer.

** Delivered by agreement with the buyer for a separate fee.

3. Specifications

3.1 Basic Technical Specifications

Table 3.1 – General Data

Description	Unit	Value
Application of the device	–	Switchgear and control-gear; induction motor protection control
Design (installation) type	–	DIN rail 35 mm
Protection rating of front panel	–	IP64
Protection rating of housing	–	IP10
Climatic version	–	NF 3.1
Contamination level	–	II
Overvoltage category	–	II
Rated voltage of insulation	V	450
Rated impulse withstand voltage	kV	2.5
Electric shock protection class	–	II
Wire cross section for connection to terminals	mm²	0.5 – 2
Torque for terminal screws	N·m	0.4

Table 3.2 – Technical Specifications

Description	Value
Operating supply voltage, three-phase	400/415 V, 50 Hz
Mains frequency, Hz	48 – 62
Rated current of CT, A	5
(Phase/line) voltage hysteresis, V	10/17
Heat hysteresis, in % of accumulated heat in case of shutdown	33
Determination accuracy of trip threshold for current, not more, in % of rated value	2
Determination accuracy of trip threshold for voltage, not more, V	3
Determination accuracy of out-of-phase voltage, not more, V	3
Voltage when maintaining serviceability:
- phase voltage, when powered by one phase and zero wire is connected, not less, V	180
- line voltage, when powered by three phases, not more, V	450
Analog inputs:
- input to connect temperature transmitter (types: Pt100, Ni100, Ni120), pcs.	1
- input to connect temperature transmitter of PTC-1000 type, pcs.	1
- three analog inputs for standard CT with 5A output (T-0.66 type or similar), pcs.	3
- input to connect differential current transformer (zero sequence transformer) pcs.	1
- input to measure current of 0-20 mA, pcs.	1
- input to measure voltage of 0–10 V, pcs.	1
Main outputs:
- load relay – two groups of changeover contacts to control the electric motor starter – 8 A, 250 V at cos φ=1
- functional relay – one group of changeover contacts – 16 A, 250 V at cos φ=1 (function of the relay is set by the user)
Permit according to temperature of temperature transmitters, °С	1
Power consumption (under load), VA, not more	5.0
Weight, not more, kg	0.34
Overall dimensions (Fig.1.1), H×B×L, mm	110×96×88.3
Position in space	free
Housing material	self-extinguishing plastic

Table 3.3 – Characteristics of built-in relay output contacts

Relay	Max. current at U~250V	Number of actuations ×1000	Max. switching power	Max. continuous boosting AC/DC voltage	Max. current at Ucont=30V
Functional relay Cos φ = 0.4	5А	100	4000 VА	440/300 V	5 А
Functional relay Cos φ = 1.0	16А	100
Load relay Cos φ = 0.4	2А	100	2000 VА	460 V	3 А
Load relay Cos φ = 1.0	8А	100

3.2 Measured, calculated, special and service parameters

Special and service parameters are intended only for transmission using MODBUS interface (RS-485/RS-232). Special and service parameters are given in Table 3.4.

Measured and calculated parameters the values of which are displayed on LCD display, limits of their measurements and accuracy are given in Table 3.5.

Parameter values can be transferred to PC connected to one of the UBZ interfaces (MODBUS, RS-232). Parameter addresses are indicated in Table 3.5.

Table 3.4 – Special and Service Parameters

Measurement functions	Range	Remarks	Address
Heat balance of the motor (Read-only parameter of RS-232, RS-485 interface)	The number 1100000 corresponds to 100% of accumulated heat at which the motor is switched off when the thermal overload protection is enabled	Read-only parameter	73, 74
Index of the last fault in the fault logbook	It varies from 0 to 49, increasing by one after recording another fault in the fault logbook. When the quantity of faults will reach 50, the count of faults will begin again from scratch.	Read-only parameter	75

Table 3.5 – Measured and Calculated Parameters

Currents

Measurement functions	Range	Accuracy	Mnemonic	Address	Data transfer devices
Effective values of phase currents, A	0.5 – 6300	2%	Phase i1, Phase i2, Phase i3	30, 31, 32	The tenth of amperes. When working with measuring transformers with rated current over 100A, the currents (measured and calculated) in addition to the zero sequence current (ground fault) are transferred via RS-232/RS485 in amperes.
Effective value of positive-sequence current, A	0.5 – 6300	2%	Positive si	33
Effective value of zero-sequence current, A	0.3 – 20	2%	Earth i0	34
Negative-sequence current (imbalance), A	0.2 – 200	5%	Revers si	35
Average current per each phase during the time specified in the parameter “Tm average i”			Average i1, Average i2, Average i3	36, 37, 38
Maximum value of the average current for each phase obtained since the last download	<3 Iсt: 2%, >3 Iсt: 10%		Peak i1, Peak i2, Peak i3	39, 40, 41
Motor starting current (average phase current)	<3 Iсt: 2%, >3 Iсt: 10%		Start i	42
Overload current (average phase current)			Overload i	43
Starting time, s	0.1 – 600		Start time	44

Voltage

Measurement functions	Range	Accuracy	Mnemonic	Address	Data transfer devices
Effective values of phase voltages (determined when connecting the neutral conductor to UBZ), V	100 – 300	3V	Phase U1, Phase U2, Phase U3	45, 46, 47	Volt
Effective values of line voltages, V	100 – 475	5V	Line U1, Line U2, Line U3	48, 49, 50	Volt
Positive-sequence voltage, V	100 – 300	3V	Positive sU	51
Negative-sequence voltage, V	3 – 300	3V	Revers sU	52
Zero-sequence voltage (vector sum of three phase voltages divided by three), V	3 – 100	3V	Zero sU	53

Miscellaneous

Measurement functions	Range	Accuracy	Mnemonic	Address	Data transfer devices
Time counter of motor operation, day	0 – 999		Time motor	54
Motor insulation resistance¹, MOhm	0 – 19.9	10%	Insulation	55	Hundreds of kOm
Mains frequency, Hz	45 – 65	1%	Frequency	56	Tenths of Hertz
Hold time before automatic restart², s	0 – 900	1 s	End of AR	57	Second
Time to overload trip³, s	0 – 600	1 s	Before OvL	58	Second
Waiting time after overload trip³, s	0 – 900	1 s	After OvL	59	Second
Full power⁴, kVA	0 – 5000	5%	Apparent P	60, 61	Dozens of Watts
Active power⁴, kW	0 – 5000	5%	Active P	62, 63
Reactive power⁴, kVAr	0 – 5000	5%	Reactive P	64, 65
Cosine of angle between voltage and phase current L1	0 – 1	5%	Cos A	66	Cosine of angle between voltage and current ×1000
Cosine of angle between voltage and phase current L2	0 – 1	5%	Cos B	67
Cosine of angle between voltage and phase current L3	0 – 1	5%	Cos C	68
Temperature of transmitter 1⁵, °C	-40 – 80	1°C	Temp dat 1	69	5000 – transmitter is off; 1000±10 – s.c. of transmitter; 2000±10 – transmitter breakout
Temperature of transmitter 2⁵, °C	-40 – 220	1°C	Temp dat 2	70
Current value at analogue input “4-20 mA”, mA	0 – 25	2%	Input i	71	1/100 mA
Voltage value at analog input “0-10 V”, V	0 – 10	2%	Input U	72	Tenths of Volt
Full electric power⁶, kVA/h	>0 – 200000000	5%	ApE	90, 91	’00 W/h
Active electric power⁶, kW/h	>0 – 200000000	5%	AcE	92, 93
Reactive electric power⁶, kVAr/h	>0 – 200000000	5%	ReE	94, 95

Notes:

If the insulation resistance of the motor is more than 20 MOm, then the value indicator displays code “>20M”. When the motor is running (energized motor) the insulation resistance is not defined and the code indicator displays ”---” (when measuring circuit of motor insulation connecting).
If ARS is disabled, the indicator displays “not”.
If the time before shutdown by thermal overload protection or waiting time before permit to start-up is not defined (more than 900 s), then the value indicator displays code “undef”. If the protection function is disabled, the indicator displays “not”.
If the power consumed by the load is more than 999 kW (kVA, kVAr), the values of power are displayed with MW (MVA, MVAr).
If the temperature value exceeds specified limits, then the indicator displays the alarm code in accordance with table 5.13. If the temperature sensor is disabled by software, then the indicator instead of temperature values displays “Off”.
In excess of the energy meter of the value 200 000 000, the counter is reset and the energy metering will start from zero. Recording the current values of the energy in the non-volatile memory is performed every 15 min.

3.3 Programmable Parameters

Programmable parameters and their variation limits are given in Table 3.6.

Table 3.6 – Programmable Parameters

Time and Transformers

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Set the current time	Real Time				Setting of current time and date	See Table 5.10
Rated output current of used CT, A	CT out i	1	5	5		151
Rated current of CT, A	CT nom i	20	800	100		152

Basic parameters

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Rated current of motor, A	Rated Inom	0	630	0	0 – current is not set: UBZ will not enable the load relay	150
Time during which the average current is measured, s	Tm average i	10	600	60	Time during which the average current is measured (parameters: “Average i1”, “Average i2”, “Average i3” of Table 3.5).	153

Over-current protection

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Type of over-current protection	Type Imax	0	5	0	0 – “Indep” - protection with independent time delay. Types of protection with dependent time delay: 1 – “SIT”; 2 – “VIT (LTI)”; 3 – “EIT”; 4 – “UIT”; 5 – “RI”.	154
Actuation setting for over-current protection, repetition factor	Imax coef	0.8	9	4	Repetition factor is set relative to rated motor current (it is used at “Type Imax” = “indep”).	155
Current protection delay tripping, s	Imax delay	0.3	600	10		156
Permit for protection operation	Imax protec	0	2	2	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	157
Sequence of tripping relative to overheating protection	Imax<>T	0	1	1	0 – “On” – tripping regardless of overheating protection; 1 – “Ind” – if there is no overheating, then over-current indicating displays but load relay is not disabled.	158

Ground fault protection (for zero-sequence current – ‘I earth’)

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Over-current tripping setting, A	I earth tresh	0.3	10	0.5	If the parameter is not included in MNS mode list, then default value is: 0.5 at In≤50A; 1.0 at In>50A.	159
Tripping delay, s	I earth delay	0.3	2	1		160
Permit for protection operation	I earth protec	0	2	2	0 – “Off” - protection is off; 1 – “OnnAR” - protection is on, ARS after tripping is disable; 2 – “On AR” - protection is on, ARS is enabled.	161

Negative-sequence current protection

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Actuation setting, %	I2 rev tresh	5	20	10	It is set as percentage of rated current.	162
Tripping delay, s	I2 rev delay	0.3	10	5		163
Permit for protection operation	I2 rev Protect	0	2	2	0 – “Off” - protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” - protection is on, ARS is enabled.	164

Analysis of causes for negative sequence current tripping

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Ratio of exceeding negative-sequence current factor to negative-sequence voltage factor	A-s I2 coef	2	4	2		165
Permit for analysis	A-s I2 protec	0	1	1	0 – “Off” - analysis is off; 1 – “On” - analysis is on.	166

Thermal overload (heat model of the motor)

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Permit for protection operation	Termal OL protec	0	2	2	0 – “Off” - protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	167
Operating time of protection in case 2 time over-current, s	Termal delay	10	120	60		168
Factor of time increasing if motor is stopped	Termal C stop	1	4	1	Compensation of cooling time increasing while motor is stopped.	169

Minimum phase current

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Actuation setting, %	Imin tresh	11	90	20	Operation threshold for the minimum operating current protection, in % of installed rated one.	170
Tripping delay, s	Imin delay	1	100	5		171
Permit for protection operation	Imin protec	0	2	2	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	172

Delayed start, rotor blocking

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Actuation setting, repetition factor	Start I Coef	1.3	7	5	Repetition factor is set relative to rated current	173
Delayed start tripping delay, s	Start I delay	1	600	10	Time of motor starting	174
Rotor blocking tripping delay, s	Block I delay	0.3	300	1		175
Permit for protection operation	St/Block prot	0	2	1	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	176

Voltage protection

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Minimum line voltage, V	Umin tresh	270	415	320		177
Tripping delay for minimum line voltage, s	Umin delay	5	30	10		178
Permit for protection operation for minimum line voltage	Umin protec	0	2	2	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	179
Maximum line voltage, V	Umax tresh	330	450	415		180
Tripping delay for maximum line voltage, s	Umax delay	0.3	10	2		181
Permit for protection operation for maximum line voltage	Umax protec	0	2	2	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	182
Line voltage imbalance, V	Uimbal tresh	15	120	35		183
Tripping delay for line voltage imbalance, s	Uimbal delay	1	30	5		184
Permit for protection operation for line voltage imbalance	Uimbal protec	0	2	2	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	185
Permit for protection operation for phase sequence	Correct phase	0	2	1	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	186

Motor phase loss with current control

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Tripping delay for phase loss, s	Phase LossT	0.3	10	0.5		187
Permit for protection operation	Phase Loss Prot	0	2	1	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	188

Frequency protection

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Minimum value of voltage frequency, Hz	Frequency Min	35	60	49.7		189
Tripping delay for minimum voltage frequency, s	FreqMin delay	1	300	10		190
Permit for protection operation for minimum voltage frequency	FreqMin prot	0	2	0	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	191
Maximum value of voltage frequency, Hz	Frequency Max	50	65	51		192
Tripping delay for maximum voltage frequency, s	FreqMax delay	1	300	10		193
Permit for protection operation for maximum voltage frequency	FreqMax prot	0	2	0	0 – “Off” – protection is off; 1 – “OnnAR” – protection is on, ARS after tripping is disable; 2 – “On AR” – protection is on, ARS is enabled.	194

Motor control and ARS

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
ARS time after protection operation at minimum current, s	AR time Imin	1	900	600		195
ARS time, s	AR time	1	900	5		196
Disabled ARS for all faults (except voltage faults)	AR	0	1	1	0 – “Off” – ARS is disabled; 1 – “On” – ARS is enabled. AR parameter value covers all types of faults except voltage faults. To disable AR in case of voltage fault it is necessary to use the parameters “Umin protec”, “Umax protec”, “Uimbal protec”.	197
Permit for motor operation after UBZ energizing	Start>Power	0	2	1	0 – “StOff” – motor starting manually on UBZ front panel; 1 – “St>AR” – motor starting after ARS time; 2 – “St>2s” – motor start after 2s.	198
Motor control on UBZ front panel	MotorOp UBZ	0	3	0	0 – “Off” - it is disabled; 1 – “Start” – motor start is enabled; 2 – “Stop” – motor emergency shutdown is enabled; 3 – “St<>” – motor start-up and shutdown is enabled.	199
Motor remote start and shutdown via RS-232/RS485 interface	MotorOp RS-2/5	0	2	0	0 – “Off” – remote control is disabled; 1 – “OnSta” – remote control is enabled; motor start after UBZ energizing is enabled after ARS time; 2 – “OffSt” – remote control is enabled, motor start after UBZ energizing is disabled until the command for remote energizing	200

Temperature control

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Permit for temperature control and type of temperature transmitter 1	Temp S1 Type	0	2	0	0 – “Off” – it is disabled; 1 – “R>1.7” – it is of motor built-in type (protection is enabled if the transmitter resistance is above 1.7 kOhm); 2 – “PTC” – PTC (1kOhm at 25°С)	201
Motor trip temperature	Temp S1 Off M	0	100	80		202
Temperature correction of the first transmitter	Temp S1 Corr	-9	9	0		203
Permit for temperature control and type of temperature transmitter 2	Temp S2 Type	0	3	0	0 – “Off” – it is disabled; 1 – “Pt100” – of Pt100 type; 2 – “Ni100” – of Ni100 type; 3 – “Ni120” – of Ni120 type.	204
Motor trip temperature	Temp S2 Off M	0	220	180		205
Warning temperature	Temp S2 Alarm	0	220	170		206
Temperature correction of the second transmitter	Temp S2 Corr	-9	9	0		207
ARS after tripping	Temp AR	0	1	1	0 – “Off” – ARS is disabled; 1 – “On” – ARS is enabled.	208
Temperature transmitters fault reaction	Temp Sens Fault	0	1	0	0 – “AonM” – warning and continuation of operation; 1 – “AoffM” – warning and motor stop.	209

Motor insulation resistance

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Protection for the motor minimum insulation resistance	Insulation Mr	0	4	1	0 – “Off” – it is disabled; 1 – “5 AR” – motor is not enabled when insulation resistance is less than 500 kOhm, ARS is enabled; 2 – “10 AR” – motor is not enabled when insulation resistance is less than 1000 kOhm, ARS is enabled; 3 – “5 nAR” – motor is not enabled when insulation resistance is less than 500 kOhm, ARS is disabled; 4 – “10nAR” – motor is not enabled when insulation resistance is less than 1000 kOhm, ARS is disabled.	210

Miscellaneous

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Activating the mode of minimum number of settings	Minimal set	0	1	1	0 – “Off” – the mode is disabled; 1 – “On” – the mode is enabled. The mode change is possible only in advanced user level mode	211
Indications on UBZ display before starting the motor	Indicat <Start	0	1	0	0 – “LineU” – line voltage: “Line U1”, “Line U2”, “Line U3”; 1 – “InsFr” – motor running time (“Time motor”), motor insulation resistance (“Insulation”), mains frequency (“Frequency”).	212
Parameter display mode	Indicat mode	0	1	0	0 – “Conti” – the parameter value is displayed continuously; 1 – “>15s” – the parameter value is displayed for 15 s	213
Functional relay operating mode	Relay F mode	0	2	0	0 – “Alarm” – relay is used as alarm relay; 1 – “Timer” – the relay is used as time relay (it is enabled after enabling the load relay after the time set parameter of “Relay F time”); 2 – “St->D” – the relay is used for motor star–delta switching (after time of “Relay F time” (address -215) the load relay is disabled, and after time of “Relay F time” (address-215) + “Delay RP RF” (address-216) the functional relay is enabled).	214
Timer value, s	Relay F time	0	300	30		215
Star-delta mode. Switching time, s	Delay RP RF	0.1	2	0.4	The time between the load relay disabling and functional relay enabling in star-delta mode.	216
Total time of the device operation, day	Time UBZ	0	999	0	*When data transmitting by MODBUS/RS-232 interface the operating time is transmitted in hours.	217
Motor operating time, day	Time motor	0	999	0	*When data transmitting by MODBUS/RS-232 interface the operating time is transmitted in hours	218
Access code of user	Users code	0	9	0	0 – keyboard is unblocked; 1-9 – user password.	219
Access code of advanced user	Password	000	999	123	000 – access to advanced user level is permitted; 000-999 – advanced user password	220
Factory settings reactivating	Default Factor	0	1	0	0 – “Off”; 1 – “On”. After “On” message and the settings setup mode quit, the factory settings will be reactivated (except the access code of advanced user)	221

The serial interface parameters (RS-485/RS-232)

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
UBZ communication address	Address UBZ	1	247	1		222
Transfer rate*	Data speed	0	1	0	0 – “9.6 k” – 9600 baud; 1 – “19.2k” – 19200 baud.	223
Converter reaction to loss of connection	Loss connect	0	3	0	0 – “non” – continuation without warning; 1 – “Alarm” – warning and continuation of operation; 2 – “StpAR” – warning and motor stop with ARS permit after restoring the connection; 3 – “StpnA” – warning and motor stop with ARS disabled after restoring the connection.	224
Detection of response overtime, s	Overexceeding	0	120	0	0 – It is disabled.	225
Permit of UBZ communication via serial link	Communication	0	2	0	0 – “Off” – communication is disabled; 1 – “RS232” – communication via RS-232; 2 – “RS485” – communication via RS-485.	226
Type of communication protocol*	ASCII-RTU	0	1	1	0 – “ASCII”; 1 – “RTU” – MODBUS modes.	227
Parity check*	Even parity	0	1	0	0 – “Off” – parity check is disabled; 1 – “On” – parity check is enabled.	228
Number of stop bits*	Stop bit	1	2	2		229
Device version	Version			9	The parameter value depends on software version.	230
Indicator illumination**	Indicator L	0	2	1	0 – “Off” – illumination is off; 1 – “On15s” – illumination is on for 15 s after pressing any buttons; 2 – “On” – illumination is on continuously.	231
Clock correction, s	Correct Time	-10	10	0	Correction of the real time clock. Compensation of time for the day.	232

Control via analog input 0-20 mA

Settings and readings	Parameter on LCD	Max. value	Factory setting	Message on LCD, actions	Address
Upper threshold, mA	Input I UP	20	10		233
Lower threshold, mA	Input I DOWN	20	1		234
Control algorithm	Input I ALG	2	0	0 – “Off” – control is off; 1 – “OffUP” – the motor is off when the current is higher than the upper threshold and it is on when the current is lower than the lower threshold; 2 – “OnUP” – the motor is on when the current is higher than the upper threshold and it is off when the current is less than the lower threshold.	235
Entry in faults logbook	Input I log	1	0	0 – “OffWr” – motor cutoff is considered the fault but not recorded in the fault logbook; 1 – “OnWr” – motor cutoff is considered the fault and is recorded in the fault logbook.	236

Control via analog input 0-10 V

Settings and readings	Parameter on LCD	Max. value	Factory setting	Message on LCD, actions	Address
Upper threshold, V	Input U UP	10	5		237
Lower threshold, V	Input U DOWN	10	1		238
Control algorithm	Input U ALG	2	0	0 – “Off” – control is off; 1 – “OffUP” – the motor is off when the voltage is higher than the upper threshold and it is on when the voltage is lower than the lower threshold; 2 – “OnUP” – the motor is on when the voltage is higher than the upper threshold and it is off when the voltage is less than the lower threshold.	239
Entry in faults logbook	Input U log	1	0	0 – “OffWr” – motor cutoff is considered the fault but not recorded in the fault logbook; 1 – “OnWr” – motor cutoff is considered the fault and is recorded in the fault logbook.	240

Other parameters

Settings and readings	Parameter on LCD	Min. value	Max. value	Factory setting	Message on LCD, actions	Address
Serviceability check of external magnetic starter (MS)	Cont Cont	0	1	1	0 – “Off” – check is disabled; 1 – “On” – check is enabled.	241
Energy meters reset	Energy RESET	0	1	0	0 – “Off”; 1 – “On” – reset.	242

Notes:

* Parameter change will happen after turning off and repeated energizing or fulfillment of “UBZ RESTART” command

** Indicator light turns off if the line supply voltage is lower than 250 V.

3.4 Protection Functions

3.4.1 Protection Types

UBZ performs the following protection types for electric motors:

over-current protection in phases;
ground fault protection (for zero-sequence current);
for negative-sequence current;
for exceeding negative-sequence current factor to negative-sequence voltage factor;
for thermal overload;
undercurrent protection in phases;
delayed starting (rotor blocking);
overheating of windings;
for minimum line voltage;
for maximum line voltage;
for line voltage imbalance (negative sequence voltage protection);
for improper phase sequence;
for decreasing of mains frequency lower that setting;
for increasing of mains frequency higher that setting;
for minimum insulation resistance of the motor winding;
for the motor phase loss (protection is operated when the motor current is disabled in one (two) phase).

3.4.2 Maximum phases current protection

Maximum current protection on phase is three phase. It is enabled when one, two or three current values reach the actuation set-point.

The protection has time delay. The time delay can be definite (constant) or dependent (inverse-definite - SIT; very inverse-definite - VIT or LTI; extremely inverse-definite - EIT; ultra inverse-definite - UIT, time delay of RI type) - curves are shown in Appendix A.

Protection with definite time delay:

In case of the protection with definite time delay the motor is off when the current of one phase is more than specified for the time T (“Imax delay” parameter).

Is = “Imax coef” (tripping ratio) × “Rated Inom” (motor rated current), and T is the delay time of the protection operation (“Imax delay”).

Example: When “Imax coef” = 4.0, “Rated Inom” = 10, “Imax delay” = 10.0, the motor will switch off in 10 seconds after one of the phase currents exceeds 40 Amp.

Protection with definite time delay

Figure 3.1 – Principle of protection with definite time delay

Protection with dependent time delay:

Protection with dependent time delay corresponds to the standards IEC 60255-3 and BS 142.

In corresponds to the set-point “Rated Inom” (motor rated current);
T (“Imax delay” parameter is time constant of the protection operation) corresponds to time delay of tripping for 10×In.

For very large currents the protection has a feature with definite time delay.

Protection with dependent time delay

Figure 3.2 – Principle of protection with dependent time delay

Appendix A provides curves for the time constant of the protection to equal 1 second (“Imax delay” parameter). When setting the different value of the time constant, the response time of the protection is changed proportional to the time constant (for example, when “Imax delay” = 10 seconds, operating time of protection at the same ratio of currents will increase 10 times).

3.4.3 Ground fault protection

It is enabled when ground-fault current reaches the tripping threshold (“I earth tresh” parameter);
the motor switches off if the ground-fault current is more than specified for the time T (“I earth delay” parameter).

3.4.4 Negative-sequence current protection (imbalance)

Negative-sequence current protection (imbalance) is enabled when a component of the negative sequence is more than the set-point (“I2 rev tresh” parameter) and stops the motor when time of this excess is more than specified value (“I2 rev delay” parameter).

If the analysis of tripping cause is enabled (“A-s I2 prot”=“On”), then in case of protection tripping due to exceeding of negative sequence current not because of line voltages imbalance (in this case the motor problems are assumed), ARS after tripping will not occur (regardless of the value of “I2 rev protec” parameter).

The coefficient of negative voltage (current) sequence is characteristic of unbalance of three-phase voltage (current). Approximately the coefficient of negative voltage sequence is determined by the formula:

$K_{2Ui} = \frac{U_{2(1)i}}{U_{1(1)i}} \cdot 100$

Where:

$U_{2(1)i}$ — RMS value of negative voltage sequence of fundamental frequency of three-phase voltage system in i-observation, V;
$U_{1(1)i}$ — RMS value of positive voltage sequence of fundamental frequency in i-observation, V.

$U_{2(1)i}$ is calculated by the approximate formula:

$U_{2(1)i} = 0.62(U_{nb(1)i} - U_{nm(1)i})$

where $U_{nb(1)i}$ , $U_{nm(1)i}$ — maximum and minimum RMS values of the three phase-to-phase voltage of the fundamental frequency in i-observation, V.

The coefficient of negative current sequence $K_{2Ii}$ is calculated similarly.

If currents imbalance is caused not by voltage imbalance, then motor fault is determined. To determine the cause of currents imbalance it is necessary to calculate the ratio of the coefficient of negative current sequence to the coefficient of negative voltage sequence ( $K_{2Ii} / K_{2Ui}$ ). And if the ratio is more than the value of “A-s I2 coef” parameter, then UBZ considers that the motor has malfunction.

3.4.5 Minimum phase current protection

it is enabled when the currents of all three phases drops lower than the set-point (“Imin tresh” parameter) and stops the motor when this drop time is more than the specified one (“Imin delay” parameter);
it is not active when the load current is less than 10% In (when decrease of the current is due to motor shutdown, not due to decrease of its load);
It has its own definite time delay of ARS (“AR time Imin” parameter).

3.4.6 Delayed start and rotor blocking

The principle of delayed start protection and rotor inter-blocking is given in Figure 3.3.

3.4.6.1 Delayed start

During start-up the protection is enabled when all phase currents are more than the set-point Is (“Start I Coef” parameter) during the period of time more than the ST time delay (“Start delay I” parameter).

Delayed start and rotor blocking

Figure 3.3 – Delayed start and rotor blocking

3.4.6.2 Rotor blocking

After motor start performing (reducing the starting current lower than 1.2 of rated one) UBZ switches to control of possible blocking of the rotor. The protection system operates when all the phase currents are more than set-points during a period of time greater than LT time delay (“Block I delay” parameter).

3.4.7 Thermal overload protection

Thermal overload protection is made on the basis of the equation solution of motor thermal balance under the following assumptions:

before the first start the motor was cold;
during the motor operation, heat generates that is proportional to the square of the current;
after motor turning off it is cooled down exponentially.

For protection, you should enter the response time in case of double overload T2 (the parameter of “Thermal delay”).

Current-time characteristic with different values of T2 is given in Figure 3.4.

For the standard recommended T2 value (60 s at 2 time overload) the following current-time characteristic applies:

I/Inom	1.1	1.2	1.4	1.7	2	2.7	3
T sec	365	247	148	88.6	60	36.4	24.6

I/Inom	4	5	6	7	8	10	15
T sec	13.5	8.5	5.9	4.3	3.3	2.1	0.9

For rotating machines, cooling is more efficient during operation than during the stop of the motor, so enter the parameter “Thermal C stop” - the constant increase rate of cooling when the motor is stopped.

After the load relay disabling owing to thermal overload with ARS permitted, the relay will be enabled again after the time more than the maximum of the two values:

time of thermal hysteresis (motor should cool down to 33% of the accumulated heat);
time of ARS.

Choosing different ARS time periods considering thermal hysteresis, one can reduce the number of starts per time device because in the intermittent mode of operation UBZ remembers the amount of heat released during the motor start.

Current-time characteristic

Figure 3.4 – Current-time characteristic

Where:

I/Iн – current ratio relative to rated one;
Т/Т2 – the actual response time relative to T2 (response time when double overload).

3.4.8 Windings overheating protection

3.4.8.1 The first input protection:

when working with motor built-in temperature transmitters (parameter “Temp S1 Type”=“R>1.7”) protection is enabled when the transmitter resistance will be more than 1700 Ohms. Set-point “Temp S1 Off M” is not used: short-circuit and breakout of the transmitter is not controlled;
when working with transmitters of PTC type (1kOhm at 25°C) (“Temp S1 Type” = PTC parameter), protection is enabled and stops the motor when the monitored temperature is more than the set-point (“Temp S1 Off M” parameter).

When working with PTC type transmitters, protection defines the cases of breakout and short circuit of the transmitter:

the breakout at the temperature higher than 100°C;
short circuit at the temperature less than minus 45°C.

3.4.8.2 The second input protection:

it is enabled when the controlled temperature is higher than set-point;
it has two independent set-points: the alarm set-point (“Temp S2 Alarm” parameter) and the set-point for the motor is off (“Temp S2 Off M” parameter).

Protection determines the cases of breakout and short circuit of the temperature transmitters:

breakout at temperature of more than 220°C;
short circuit at temperature of less than minus 45°C.

On the second input the protection is operated with temperature transmitters of Pt100 type (platinum type for 100 Ohm at 0°C) or Ni100 (Ni120) (Nickel type for 100 Ohm (120 Ohm) at 0°C) in accordance with the standards of IEC 60751 and DIN 43760.

3.4.9 Voltage protection

In UBZ voltage protection before enabling the load it is necessary to check the corresponding set-points and depending on their value, the load relay enabling will be permitted or disabled; when the motor is on, the voltage control is fulfilled, but the decision relative to disabling is made according to currents.

The voltage protections are the following:

at minimum line voltage (it is enabled if at least one of the line voltages is less than the set-point (“Umin tresh” parameter) within the time specified by “Umin delay” parameter);
at maximum line voltage (it is enabled if at least one of the line voltages is more than the set-point (“Umax tresh” parameter) within the time specified by “Umax delay” parameter);
during line voltages imbalance (it is enabled if the difference between effective values of the line voltages is more than the set-point (“Uimbal tresh” parameter) within the time specified by “Uimbal delay” parameter).

3.4.10 Phase sequence protection

Phase sequence protection (“Correct phase” parameter) is enabled in case of improper phase sequence; it disables the motor and blocks its further operation.

3.4.11 Network power frequency drop protection

Network power frequency drop protection is enabled, if the network power frequency is less than the set-point (“Frequency Min” parameter) within the time specified by “FreqMin delay” parameter.

3.4.12 Network power frequency rise protection

Network power frequency rise protection is enabled, if the network power frequency is higher than the set-point (“Frequency Max” parameter) within the time specified by “FreqMax delay” parameter.

3.4.13 Protection for minimum resistance of motor winding insulation

After UBZ energizing before the output relay will be on, it is necessary to check the insulation level of stator winding relative to the housing. The level of stator winding insulation relative to housing is also checked, when the load relay is on, but the motor currents are less than 10% of rated current (in this case UBZ considers that the motor is off).

When “Insulation Mr” = “5 AR” (“5 nAR”) the load is disabled if the insulation resistance is lower than 500 kOhm ±20 kOhm, and when “Insulation Mr” = “10 AR” (“10 nAR”) if it is less than 1000 kOhm ±50 kOhm. During automatic restarting “AR”, the load will on after restoring the insulation resistance and after ARS time finishing. If “nAR”, ARS will not on.

3.4.14 Protection for the motor phase(-s) break (loss)

Protection for the motor phase(-s) break (loss) is enabled, if one of the motor phase current is more than 10% of the rated one (“Rated Inom” parameter), and any of the remaining phases of the motor is less than 7% of the motor rated current.

3.4.15 Serviceability check of external magnetic starter

UBZ detects the motor currents when the load relay is off (if the load relay and functional relay is off in star-delta mode). In this case, UBZ indicates the fault of external MS enabling the motor, until then UBZ is turned off or control of the motor currents is disabled when load relay is off (Cont Cont = 0 (“Off”) parameter).

4. UBZ Design

UBZ is microprocessor-based digital device that provides a high degree of reliability and accuracy. Operational power is not required. The controlled voltage is simultaneously the power supply voltage.

5. Intended Use

5.1 Preparation for operation

5.1.1 Preparation for connection

Unpack the device (we recommend to keep the original packing for the entire warranty period of the device operation);
Check the device for damage after transportation; in case of such damages detection, contact the supplier or manufacturer;
Check for components (Section 2), in case of detection of incomplete device, contact the supplier or manufacturer;
Carefully study the Operating Manual (pay special attention to the connection diagram to power the device);
If you have any questions regarding the installation of the device, please contact the manufacturer by telephone number indicated at the end of this Operating Manual.

5.1.2 Selection of Current Transformers (CT)

Rated output current of CT should be 5A.
Rated input current of CT (Ict) is selected based on the rated current of the motor (In), the motor starting current, start duration, the time required for ARS (taking into account the characteristics of UBZ inputs designed to connect CT (Table 5.1)).

Table 5.1 – Characteristics of UBZ-304 inputs designed to connect CT

Current of UBZ inputs designed for measurement of CT output currents, A	Ratio of overload relative to rated current (5A)	Maximum duration of current action, s	Minimum delay before restarting, s
0 – 12	2.4	continuously	–
12 – 15	3	60	10
16 – 20	4	30	15
21 – 25	5	15	30

Rated input current of CT should be within the range: In < Ict < 3×In.

It is recommended to use CT with Ict = 2×In.

5.1.3 General

To ensure the reliability of electrical connections you should use flexible (stranded) wires with insulation for voltage of not less than 450V, the ends of which it is necessary to be striped of insulation for 5±0.5 mm and tightened with bootlaces. Recommended cable cross section for connection is not less than 1 mm².

Wires fastening should exclude mechanical damage, twisting and insulation abrasion of wires.

IT IS NOT ALLOWED TO LEAVE EXPOSED PORTIONS OF WIRE PROTRUDING BEYOND THE REMOVABLE TERMINAL BLOCK.

For reliable contact it is necessary to perform tightening of screws of removable terminal block with the force specified in Table 2.

To improve performance properties of UBZ, it is recommended to install fuses (fusible elements or their analogues) in the following circuits (listed in the order required; a hyphen is the recommended fuse value):

UBZ power supply circuits (34, 35, 36 – L1, L2, L3) – 1 A;
circuits for measurement of temperature, current, voltage (1 - 9) – 0.5 A;
RS-485 (10 - 12) – 0.5 A.

UBZ Installation

Figure 5.1 – UBZ Installation

fastener
UBZ
rubber gasket

5.1.4 Device Installation

5.1.4.1 UBZ is the device of panel design version.

The panel design should meet the following requirements:

the hole for UBZ installation is square-shaped of 91.5×91.5 mm (+0.5mm tolerance);
the distance between UBZ panels (top, bottom and side) and the relevant surfaces of the panel should be at least 10 mm;
if it is assumed to have operational use of communication via RS-232, the distance between the top panel of UBZ and the corresponding surface of the panel should be at least 30 mm.

5.1.4.2 Installation procedure:

put the rubber gasket on UBZ (item 3 in Figure 5.1);
install UBZ into the panel hole;
install the fasteners (item 1 in Figure 5.1) on the lower and upper UBZ panels;
secure UBZ in the panel with tightening screws of the fastener.

UBZ-304 Connection Diagram

Figure 5.2 – UBZ-304 Connection Diagram

A – UBZ
F1-F3 – Fusible element for 1 А (or its equivalent)
K – Magnetic starter (MS)
R1 – Temperature transmitter (for example: PTC1000, EKS111 made by DANFOSS)
R2 – Temperature transmitter (for example: PT100)
Q1, Q2 – automatic breaker
T1-T3 – Current transformer (output 5 A)
T4 – Differential transformer

5.1.5 UBZ-304 connect

5.1.5.1 Connect the current transformers in accordance with Figure 5.2;

5.1.5.2 Pass through a differential current transformer (zero sequence transformer) all three phase wires and connect it to UBZ;

5.1.5.3 To monitor and measure the motor insulation, connect the control terminal of the insulation 23 to one of output contacts of MS. If the motor housing is not grounded, or network with isolated neutral is used, or neutral wire is not connected to UBZ terminal, it is necessary to connect electrically the motor housing to the terminal 24 of UBZ.

5.1.5.4 Connect the motor to UBZ in accordance with Figure 5.2. When using the motor with the switching over the windings during star-delta starting-up, perform the connection in accordance with Appendix B.

5.1.5.5 To work with UBZ from personal computer as the control or supervising using the program of “UBZ-304/305 Control Panel” it is necessary:

download the program of “UBZ-304/305 Control Panel” from the manufacturer’s web-site (https://novatek-electro.com/en/software/control-panel-of-ubz-304305.html);
to install on the PC the program of “UBZ Control Panel”, starting the program “Setup_cplubz304(Х.Х).exe” (X.X – number of software version);
to connect “RS232” connector on the top panel of UBZ to RS-232 connector of PC using the cable KC-01;
to set the parameter of “Communication” = “RS232”.

5.1.5.6 In case of MODBUS usage, connect the communication lines to terminals 10 (GND), 11 (line B RS-485), 12 (line A RS-485) of UBZ. Set the parameter of “Communication” = “RS485”.

5.1.5.7 Energize UBZ-304

The enabling sequence for the load relay after energizing is determined by the values of the parameters “AR time” and “Start>Power”.

5.1.5.8 In the course of first starting in accordance with factory settings UBZ is in the mode of MNS in which it is possible to set the following parameters:

CT rated current (parameter of “CT nom i”);
motor rated current (parameter of “Rated Inom”).

For normal operation of UBZ it is enough to set these parameters according to used CT and the motor.

5.1.5.9 Disable power of UBZ;

5.1.5.10 Connect the magnetic starter (hereinafter referred as MS) of the motor in accordance with Figure 5.2.

5.2 UBZ Control

5.2.1 Modes of UBZ control and status

UBZ has five control modes:

Keyboard blocking
MNS
User level
Advanced user level
Remote control

All the modes of control have possibility to switch UBZ in the state:

Viewing the measured and calculated parameters (Table 3.5)
Viewing the faults logbook

5.2.2 Measured and calculated parameters view state

Measured and calculated parameters view state is the principal state. From all other modes UBZ returns to this mode automatically (if after 30 s, no button is pressed).

In this mode the first three lines of the indicator displays a group of three functionally close settings (when adding the values of temperature transmitters or analog inputs – a group of two parameters) (Figure 5.3).

The information displayed in the fourth line of the indicator depends on the state of UBZ.

If the load relay is enabled, then the fourth line of the display shows the current time (Figure 5.3).

If the load relay is off, then the fourth line of the indicator can display the following:

“AR=NOT Ir=0 15:30:17” in case if the motor start is impossible as the motor rated current is not set (parameter of “Rated Inom” =0);
“AR=NOT 15:30:17” in case if the fault occurred after which ARS is disabled;
“AR=350 15:30:17” in case if the fault occurred and ARS is possible (ARS time account is on – 350 s left to ARS).

UBZ Indicator in view mode (load relay on)

Figure 5.3 – UBZ Indicator in view mode of measured and calculated parameters (load relay is on)

The display shows:

In line 1 – current in phase L1 – 345 А
In line 2 – current in phase L2 – 350 А
In line 3 – current in phase L3 – 342 А
In line 4 – current time

In the second and third variant, information of the fourth line of the indicator is consistently changing – in addition to reports about the possibility of starting the motor; it displays the total number of faults and type of fault on the display (Figure 5.4). For example, if the information on the indicator corresponds to Figure 5.4, then in 2s the fourth line displays the fourth type of fault.

UBZ Indicator in fault conditions

Figure 5.4 – UBZ Indicator in view mode of measured and calculated parameters (in fault conditions)

The display shows:

In line 1 – line voltage U1 – 345 V
In line 2 – line voltage U1 – 312 V
In line 3 – line voltage U1 – 210 V
In line 4 – “Imax” – type of fault (over-current protection); “Er 3:8” – the indicator displays the third fault; total number of existing types of faults is 8

5.2.3 Mode of ‘Keyboard blocking’

When the keyboard is blocked you cannot view and reinstall the programmable parameters.

When the keyboard is blocked, pressing the SETUP button leads to the appearance on the indicator the message “blocked buttons” (Figure 5.5).

Indicator when keyboard is blocked

Figure 5.5 – Indicator when the keyboard is blocked

To unblock the keyboard, it is necessary to press again the SETUP button. The led turns on SETUP, and the indicator displays the inscription “USERS PASSWORD” and “<0>”. With the help of UP and DOWN buttons you can dial the digit of user password from 1 to 9 and can press the button RES/MEM/SEL. If the password is correct, the keyboard is unblocked. If after unblocking the keyboard no button is pressed within 15 s and setting of blocking has not been disabled by the user, the keyboard is blocked again.

5.2.4 Mode of ‘Minimum number of settings’ (MNS)

Mode of MNS is designed to facilitate the work of the service personnel with UBZ.

In case of initial factory settings UBZ is in the mode of MNS.

When UBZ is operated in the mode of MNS the green led MMSP is on.

UBZ operation in MNS mode differs from UBZ operation in the mode of user level that the parameters not included in the list of MNS are set to factory defaults, and when you log in the user menu they are not visible.

Operation with parameters those are included in the list of MNS is the same as with the settings in the mode of user level.

When the mode of MNS is disabled (setting of parameter “Minimal set” is in “Off” position), the led MMSP goes out and UBZ switches to the user level. At the user level you can change all the settings (included and not included in the list of MNS), if the change is not disabled by the advanced user.

Adding of any parameter in the list of MNS and disabling of MNS mode is possible only in advanced user level.

UBZ will transfer to the MNS mode after reset to factory settings.

5.2.5 Mode of ‘User level’

When UBZ device is in the user-level mode, led MMSP is off.

To view and change the parameters of user level you should press the SETUP button, the led SETUP is on and the indicator displays the user menu (Figure 5.6).

Figure 5.6 – User’s Menu

Using DOWN and UP buttons select the desired parameter (in Figure 5.6, “CT nom i” parameter is selected; it is the rated current of the CT) and press the “SETUP” button (Figure 5.7).

Change setting screen

Figure 5.7 – Screen of changing the setting in the user mode

If the fourth line of the indicator is marked by “ADV” (Figure 5.7), the change of the parameter value in the user mode is disabled and, in this case, it can only be changed in the mode of “Advanced user level”.

If the parameter is not in the list of MNS (the fourth line of the indicator has the inscription “OFF MMSP”), then to change the value of the parameter it is necessary preliminary to include it in the list of MNS.

To do this it is required the following:

using DOWN and UP buttons select the parameter;
press SETUP button;
press simultaneously DOWN and UP buttons (on the display instead of the inscription “OFF MMSP” the inscription “MMSP” should remain).

The value of the parameter in the user mode can be changed if the fourth line of the indicator has only the inscription “MMSP”. To do this it is required:

using buttons DOWN or UP select the desired parameter value;
using the button RES/MEM/SEL, record the value of the parameter, and to go back to menu without recording, press the SETUP button.

If no button is pressed within 30 seconds, UBZ switches to the state of the viewing the measured and the calculated parameters.

To exit to menu before 30 seconds you need to press button RES/MEM/SEL.

5.2.6 Mode of “Advanced user level”

Access to the advanced user level:

Press the SETUP button for 5 seconds, release the button.

If the level is password protected, the led SETUP is on and the display shows the “PASSWORD” inscription and “000” will flash (Figure 5.8).

Advanced user password

Figure 5.8 – Advanced user password

Using UP and DOWN buttons sequentially, enter the three-digit password of advanced user, from 1 to 9 and separate dialing with pressing the button RES/MEM/SEL. If the password is wrong, then UBZ will return to the view state of the parameters, otherwise UBS will go to the advanced user level (Figure 5.9).

Figure 5.9 – Advanced user level

The procedure for changing the settings on the advanced user level is the same as user-level, but the parameter recording does not depend on the inscription “ADV” presence in the fourth line of the indicator.

At the advanced user level, the availability of any parameter at the user level can be disabled or enabled.

To do this it is required the following:

using DOWN and UP buttons, select the parameter (Figure 5.9);
enter the menu where setting is changed by pressing SETUP button;
press both buttons SETUP and DOWN.

In case of restricting access to change the parameter at the user level in the fourth line of the indicator the inscription “ADV” will display.

5.2.7 Factory settings

Factory settings are possible in two ways.

The first method: set the parameter “Default Factor” to “On”; after exiting from the mode for setting the factory settings will be restored.

This method does not recover the following settings:

access code of advanced user (“Password”);
current time and date;
clock correction (“Correct Time”);
the device operating time (“Time UBZ”);
operating time of the motor (“Time motor”).

The second method: when UBZ energizing, hold pressed for two seconds the buttons SETUP and RES/MEM/SEL. Factory settings are restored (advanced user password - 123).

This method does not recover the following settings:

the device operating time (“Time UBZ”);
operating time of the motor (“Time motor”);
clock correction (“Correct Time”).

After you complete the installation of factory parameters, UBZ will start operation in the mode of MNS, the list of which the settings are included:

motor rated current, “Rated Inom”
current time setting, “Real Time”
CT current, “CT nom i”

5.2.8 Real time setting

To set the real time it is necessary the following:

pressing SETUP button, enter the parameters setting mode;
using UP and DOWN buttons, select parameter “Real Time”;
press the button SETUP (Figure 5.10);

Time setting display

Figure 5.10 – View of the display when setting the time

using UP and DOWN buttons, select the desired date and press the button RES/MEM/SEL;
repeat step 4 to set the month, year, hour and minute.

When recording minutes (at the moment of pressing the button RES/MEM/SEL), the number of seconds will be automatically set to zero.

If you move to the next parameter without changes, instead of the button RES/MEM/SEL, press the button SETUP.

If no button is pressed for 15 seconds, UBZ will automatically switch to the parameter view mode.

5.2.9 UBZ faults reset on front panel

Fault reset is performed when the motor is off. To reset the faults on the front panel, press simultaneously the buttons SETUP and DOWN, in this case:

faults are reset regardless of whether ARS is disabled or enabled (besides the current faults and faults by the presence of motor currents when load relay is off);
counting of ARS is off;
in the absence of the current troubles the motor is off.

5.2.10 Energy meters reset

Reset of energy meters (total, active and reactive) is performed when setting the parameter “Energy RESET” to “On” (setting to “1” when using RS-232/RS-485 interface). After reset of energy meters, the parameter “Energy RESET” will automatically switch to “Off” (“0” – when reading the parameter via RS-232/RS-485 interface).

5.3 UBZ Operation

In describing the operation of UBZ it is assumed that this protection is enabled and all the required sensors are connected.

5.3.1 UBZ operation before load relay on

5.3.1.1 UBZ operation after energizing (first start-up)

After energizing the indicator displays the device name, the version number of software, the name of the manufacturer and the operation performed (Figure 5.11).

Startup indicator

Figure 5.11 – UBZ indicator view after energizing

After 1-2 seconds the indicator will display the values of the measured parameters. What parameters will be displayed on the indicator it depends on the value of the parameter “Indicat <Start”:

line voltages at “Indicat <Start”=“LineU”;
the motor operating time, the insulation resistance of the motor and mains frequency at “Indicat <Start”= “InsFr”.

Before the load relay enabling UBZ checks the following:

the level of stator winding insulation relative to the motor housing (when insulation resistance is less than 500 ± 20 kOhm at “Insulation Mr” = “5” (1000 ± 50 kOhm at “Insulation Mr” = “10”) the load is not enabled);
the quality of the mains voltage: full phase, symmetry, the current line voltage value;
correct phase sequence, the lack of their “coincidence”.

If any of disabling factors, the load relay is not activated, and the display of mnemonics shows the corresponding message about the fault (Table 5.13) and the led FAULT lights up.

In the absence of disabling factors, enabling the load relay is determined by the value of parameter “Start>Power” (UBZ operation after energizing):

when “Start>Power” = “StOff”, the load relay will not be enabled. To enable the load relay in this case, you should simultaneously press UP and DOWN buttons.
when “Start>Power” = “St>AR” the load relay will be enabled after ARS time.
when “Start>Power” = “St>2s” the load relay will be enabled within 2 seconds after energizing.

Simultaneously with the load relay enabling the green led “Power relay” lights up.

After you activate the relay and up to the moment of the motor starting (motor start is determined by the excess of the load current of 120% level of rated current), control and taking action on voltage quality is maintained. If within no-current pause the disabling factors are appeared, the load relay is deactivated.

UBZ operation when enabled remote control of the motor via RS-232/RS-485 interface (parameter “MotorOp RS-2/5”) is considered in Section 5.4.9.

5.3.1.2 UBZ operation after shutdown owing to the fault

UBZ operation in this case is similar to the work when first starting, but enabling the load relay does not depend on the value of the parameter “Start>Power”.

If after the fault ARS is disabled (“AR”=“Off”), then with disabled motor start on the front panel (it is determined by the value of the parameter “MotorOp UBZ”) the automatic enabling the motor is impossible up to UBZ turning off. The action of the parameter “AR” value is applied to all types of faults except voltage faults. To disable ARS in case of voltage faults you should use the parameters “Umax protec”, “Umin protec”, “Uimbal protec”.

5.3.2 UBZ operation after load relay enabling and motor is on

UBZ provides monitoring for voltage and currents. The load relay is disabled when any protection tripping from Table 5.13 with the exception of:

voltage protection;
overcurrent protection with “Imax<>T” =“Ind” (in this case, the warning is there, but the load relay is not disabled).

The indicator can display phase currents of motor or group of three (two) parameters selected by the user (Table 3.5).

The group of parameters selected by the user can be displayed constantly (“Indicat mode” = “Conti”) or for 15 s, and then indication of motor currents returns (“Indicat mode” = “>15s”).

5.3.3 Functional relay operation

The functions performed by the functional relay are determined by the parameter “Relay F mode”.

When “Relay F mode” = “Alarm”, the relay is used as alarm relay (LEDs Ｙ/△ and TR do not on). The relay contacts are closed when there is any fault specified in Table 5.13.

When “Relay F mode” = “Timer”, the relay is used as time relay (LED TR is on): it turns on after the time set by the parameter “Relay F time”, after the load relay enabling.

When “Relay F mode” = “St->D”, the relay is used to switch the motor windings from star to delta (LED Ｙ/△ is on). In this mode the load relay is activated the same way as in the mode “Relay F mode”=“Alarm”, but after the time set by parameter “Relay F time” it is disabled. After the time set by the parameter “Delay RP RF”, after the load relay is off, the functional relay is activated.

5.4 Operation of UBZ-304 together with computer

5.4.1 Communication protocol and interface

The communication between UBZ and computer can be via RS-232 or RS-485 interface (parameter “Communication”).

For communication MODBUS Protocol is used in RTU mode or MODBUS in ASCII mode (parameter “ASCII-RTU”).

In ASCII mode 8-bit data is the combination of two ASCII characters (Table 5.2). For example, 1-data byte: 64 Hex, in ASCII consists of two characters ‘6’ (36 Hex) and ‘4’ (34 Hex).

Table 5.2 – ASCII Character Encoding

Character	’0'	'1'	'2'	'3'	'4'	'5'	'6'	'7’
ASCII code	30 Hex	31 Hex	32 Hex	33 Hex	34 Hex	35 Hex	36 Hex	37 Hex

Character	’8'	'9'	'A'	'B'	'C'	'D'	'E'	'F’
ASCII code	38 Hex	39 Hex	41 Hex	42 Hex	43 Hex	44 Hex	45 Hex	46 Hex

In RTU mode 8-bit data is the combination of 4-bit hexadecimal digits. For example, 64 Hex.

During data exchange via RS-485 or RS-232 the blue LED EXCHANGE is on.

Diagram of UBZ connection to computer is shown in Figure 5.12.

Each UBZ has the individual communication address. The computer controls each UBZ recognizing them by their addresses.

UBZ PC connection diagram

RS-232 and RS-485 connection diagrams

RS-485 connection diagram

Figure 5.12 – Diagram of UBZ connection to computer

5.4.2 Communication parameters

the device address: 1-247 (parameter “Address UBZ”);
data transfer rate: 9600 baud, 19200 baud (parameter “Data speed”);
reaction to loss of connection: the continuation of operation with no warning, the warning and continued operation, the warning and stopping the motor with ARS enabling after restoration of communication, warning and motor stop with ARS disabling (parameter “Loss connect”);
detection of exceeded time for reply: 1s – 120s (parameter “Overexceeding”).

The format of the transmitted word is the following:

8 data bits in RTU mode and 7 data bits in ASCII mode;
parity check (parameter “Even parity”): disabled (“Off”), enabled (“On”); (factory setting is “Off”);
number of stop bits (parameter “Stop bit”): 1 or 2 (factory setting is 2).

5.4.3 Communication protocol

Exchange between PC and UBZ is carried by data packets. Data packet format in RTU mode is shown in Table 5.3 and in ASCII mode – in Table 5.4.

Table 5.3 – Data packet in RTU mode

Name	Description
START	Silence interval – over 4 ms at transmission rate of 9600 baud, or more 2 ms at transmission rate of 19200 baud
ADR	UBZ communication address (8 bit)
CMD	Command code (8 bit)
DATA 0…DATA (n-1)	Content of data: N×8 bit data (n≤24)
CRC CHK low	CRC – Cyclic Redundant Check (16 bit)
CRC CHK high
END	Silence interval – over 4 ms at transmission rate of 9600 baud, or more 2 ms at transmission rate of 19200 baud

Table 5.4 – Data packet in ASCII mode

Name	Description
STX	Start character ’:’ (3A Hex)
ADR1, ADR0	UBZ communication address (8 bit) consisting of two ASCII characters
CMD1, CMD0	Command code (8 bit) consisting of two ASCII characters
DATA 0…DATA (n-1)	Content of data: N×8 bit data (n≤24) consisting of two ASCII characters each
LRC CHK 1, LRC CHK 0	LRC Cyclic Redundant Check: 8-bit control total consisting of two ASCII characters
END1	Carriage return CR (0D Hex)
END0	Line feed LF (0A Hex)

5.4.4 Command codes

5.4.4.1 General

The format of data characters depends on command codes. Examples of transmission of commands and data are given for RTU mode. For ASCII mode the command codes are not changed, but the format of the transmission data and control of data is based on the Table 5.4.

5.4.4.2 Command for reading the register group

Command code – 0x03, reading n-words

For example, reading of continuous 2 words from starting address 2102H in UBZ with communication address 01H in RTU mode (Table 5.5) and in ASCII mode (Table 5.6).

Table 5.5 – Example of reading register group (RTU mode)

Command Message	Value	Response Message	Value
ADR	0x01	ADR	0x01
CMD	0x03	CMD	0x03
Start address (high)	0x21	Number of data in bytes	0x04
Start address (low)	0x02	Data at address (high)	0x17
Number of words (high)	0x00	Data at address (low)	0x70
Number of words (low)	0x02	Data at address+1 (high)	0x00
CRC CHK low	0x6F	Data at address+1 (low)	0x00
CRC CHK high	0xF7	CRC CHK low	0xFE
		CRC CHK high	0x5C

Table 5.6 – Example of reading register group (ASCII mode)

Command message	Character	Code transferred, HEX	Numbers for LRC, HEX
STX	’:‘	3A
ADR	’0’, ‘1’	30, 31	01
CMD	’0’, ‘3’	30, 33	03
Start address of data	’2’, ‘1’, ‘0’, ‘2’	32, 31, 30, 32	21, 02
Number of data in words	’0’, ‘0’, ‘0’, ‘2’	30, 30, 30, 32	00, 02
LRC CHK 1, LRC CHK 0	’D’, ‘6’	44, 36
END1	CR	0D
END0	LF	0A

5.4.4.3 Command of register entries

Command code – 0x06, record – one word

Data recording is possible at the addresses of programmable parameters (Table 3.6), except the parameters listed in Table 5.7.

The parameter recording is independent of set protection of the advanced user (entry by the communication line has higher priority).

When recording new value of the parameter into the cell protected by MNS, the parameter is automatically removed from this mode.

Table 5.7 – Parameters not available for writing

Settings and readings	Displaying	Address
Total time of device operation, day	Time UBZ	217
Motor operating time, day	Time motor	218
Access code of user	Users code	219
Access code of advanced user	Password	220
Restoration of factory settings	Default Factor	221
Device design version	Version	230

Example: recording order is 1000 (0x03E8) to register with address 0x00A0 to UBZ with communication address 01H in RTU mode is shown in Table 5.8.

Table 5.8 – Example of writing to register (RTU mode)

Command Message	Value	Response Message	Value
ADR	0x01	ADR	0x01
CMD	0x06	CMD	0x06
Start address (high)	0x00	Start address (high)	0x00
Start address (low)	0xA0	Start address (low)	0xA0
Data (high)	0x03	Data (high)	0x03
Data (low)	0xE8	Data (low)	0xE8
CRC CHK low	0x89	CRC CHK low	0x89
CRC CHK high	0x56	CRC CHK high	0x56

5.4.4.4 Command for diagnostics

Command code 08h – diagnostics

The 08h function provides a number of tests for checking the communication system between PC and UBZ, and UBZ serviceability control.

The function uses the sub-function field to specify the action performed (test).

Sub-function 00h – return of request data

The data transmitted in the data field of the request should be returned in the response data field.

Example of request and response for MODBUS RTU mode:

	Address	Function	Sub-function HB	Sub-function LB	Data HB	Data LB	CRC LB	CRC HB
Request	01h	08h	00h	00h	A0h	3Ch	98h	1Ah
Response	01h	08h	00h	00h	A0h	3Ch	98h	1Ah

Figure 5.13 – Example of request and response for sub-function 00h – return of request data

Sub-function 01h – restart of communication options

During fulfillment of the command UBZ performs only change in baud rate. To change totally the communication settings you should run the command “UBZ RESTART” (“RESTART”).

Example of request and response for MODBUS RTU mode:

	Address	Function	Sub-function HB	Sub-function LB	Data HB	Data LB	CRC LB	CRC HB
Request	01h	08h	00h	01h	00h	00h	B1h	CBh

Response is not returned.

Figure 5.14 – Example of request and response for sub-function 01h – restart of communication options

5.4.5 Control of correct transmission of data packet

5.4.5.1 Control of correct transmission of data packet in RTU mode

To check the correctness of data transmission in RTU mode the CRC Cyclic Redundant Check – the code for cyclic control is used.

The Cyclic Redundant Check (CRC16) is a cyclic verification code based on the polynomial A001h. The transmitting device forms the Cyclic Redundant Check for all bytes of the message transmitted. The receiving device similarly generates the Cyclic Redundant Check for all bytes of the message received and compares it with the Cyclic Redundant Check received from the transmitting device. In case of mismatching the generated and received Cyclic Redundant Check the error message will be generated.

The field of Cyclic Redundant Check has two bytes. CRC in the message is transferred with low byte first.

CRC is formed by the following algorithm:

loading CRC register (16 bit) by devices (FFFFh);
exclusive OR with the first 8 bits of the byte of the message and CRC register contents;
shift of the result one bit to the right;
if shifted bit = 1, exclusive OR of the contents of the register with value A001h;
if shifted bit = 0, repeat step 3;
repeat steps 3, 4, 5, until 8 shifts;
exclusive OR with the following 8 bits byte of the message and CRC register contents;
repeat steps 3 to 7 until all bytes of the message will be processed;
the final contents of the register will contain the CRC.

Example of Program CRC code generation in the language C. The function has two arguments:

unsigned char* data – a pointer to the message buffer
unsigned char length – the quantity of bytes in the message buffer

The function returns the CRC value as a type of unsigned integer.

unsigned int crc_chk(unsigned char* data, unsigned char length)
{
    int j;
    unsigned int reg_crc = 0xFFFF;
    while(length--)
    {
        reg_crc ^= *data++;
        for(j = 0; j < 8; j++)
        {
            if(reg_crc & 0x01)
                reg_crc = (reg_crc >> 1) ^ 0xA001; // LSB(b0)=1
            else
                reg_crc = reg_crc >> 1;
        }
    }
    return reg_crc;
}

5.4.5.2 Control of correct transmission of data packet in ASCII mode

To check the correctness of data transfer in ASCII mode LRC Redundant Check – longitudinal redundancy check is used. LRC is 8-bit number transmitted as two ASCII characters. The LRC is formed by inverse transformation of all ASCII characters in eight-bit binary numbers, the addition of these numbers without accounting for the transfer, and the calculation of additional code of the received number. At the receiver, the LRC is calculated again and compared with the received LRC. In the calculation of LRC the colon, CR and LF are discarded.

An example of the LRC calculation for the command for reading of continuous 2 words from starting address 2102H in UBZ with communication address 01H is shown in Table 5.6.

5.4.6 Register addresses

The register addresses of measured and calculated parameters of UBZ are given in Table 3.5.

The register addresses of programmable parameters are given in Table 3.6.

The register addresses of special and service parameters and their purpose are given in Table 3.4.

The register address of the status and purpose bit data in Table 5.9.

The register addresses of the alarm log are given in Table 5.9.

The register addresses of time settings are given in Table 5.10.

The register address of commands is 903 (Table 5.12).

Table 5.9 – Register addresses for UBZ state and fault logbook

Description	Address	Service	Description	Remark
Register of UBZ state	900	Bit 0	0 – No fault; 1 – fault (code of fault in register 241)
		Bit 1	0 – load relay is disabled; 1 – load relay is enabled
		Bit 2	0 – functional relay is disabled; 1 – functional relay is enabled
		Bit 3	0 – restart is disabled; 1 – ARS is waited
		Bit 5-4	Mode of functional relay: 00 – alarm relay; 01 – time relay; 10 – star/delta
		Bit 6	0 – MNS mode is disabled; 1 – MNS mode is enabled
		Bit 7	0 – clock battery is normal; 1 – the clock battery should be replaced
		Bit 8	0 – normal operation; 1 – UBZ is in area of hysteresis (analog inputs)
Register of fault 1	901		Bit service as per Table 5.13	0 – no fault; 1 – fault
Register of fault 2	902		Bit service as per Table 5.13
Fault logbook
Fault code 1	1000		Fault code as per Table 5.13
Parameter value 1	1001		Parameter value as per Table 5.13
Fault time 1	1002		Low byte – seconds, high byte – minutes
	1003		Low byte – hours, high byte – day of month
	1004		Low byte – month, high byte – (year minus 2000)
Fault code N	1000+(N-1)×5		Fault code as per Table 5.13
Parameter value N	1000+(N-1)×5+1		Parameter value as per Table 5.13
Fault time N	1000+(N-1)×5+2		Low byte – seconds, high byte – minutes
	1000+(N-1)×5+3		Low byte – hours, high byte – day of month
	1000+(N-1)×5+4		Low byte – month, high byte – (year minus 2000)

5.4.7 Time parameter registers

The parameters are transmitted in binary decimal code. For example, the code 0x14 in the register of minutes means 14 minutes.

Registers of time settings allow reading and recording of data.

Table 5.10 – Time parameter register addresses

Parameter	Address	Remark
Seconds	80
Minutes	81
Hours	82
Day	83
Month	84
Year	85	Last two digits of the current century are recorded (read) in the register

5.4.8 Communication errors handling

In case of erroneous situation when making the frame (parity error, frame error, checksum error) UBZ returns no reply.

In the event of an error in the format or value of data transferred (unsupported function code, etc.) UBZ accepts the request frame and builds a response with a symptom and error code. The error indicator is the high bit set to one in the function field. For the error code there is separate field in the response. Response example is given in Figure 5.15. Error codes are listed in Table 5.11.

Request – Function 30h is not maintained:

Address	Function	Data	CRC LB	CRC HB
01h	30h		XXh	XXh

Response:

Address	Function	Error code	CRC LB	CRC HB
01h	B0h	01h	94h	00h

Figure 5.15 – Example of the response after error occurs

Table 5.11 – Error codes

Error code	Name	Description
01h	ILLEGAL FUNCTION	Received the function code cannot be processed by UBZ
02h	ILLEGAL DATA ADDRESS	The data address specified in the request is not available to this slave
03h	ILLEGAL DATA VALUE	The value contained in the request data field is disabled value for UBZ
04h	SLAVE DEVICE FAILURE	While UBZ attempted to perform the requested action, unrecoverable error occurred
05h	ACKNOWLEDGE	UBZ accepted the request and is processing it, but this takes much time. This response prevents master from generating timeout errors
06h	SLAVE DEVICE BUSY	UBZ is busy of processing a command. The master should repeat the message later when the slave is freed
07h	NEGATIVE ACKNOWLEDGE	UBZ cannot perform the program function received in request

5.4.9 Remote control of the motor using RS-232/RS-485 interface

UBZ operation in remote control mode is determined by parameter “MotorOp RS-2/5”:

When “MotorOp RS-2/5” equal to “Off” (0) – remote control of the motor is disabled.

With activated remote control (parameter “MotorOp RS-2/5”=“OnSta”(1) or “OffSt” (2)), motor start on the front panel is disabled regardless of the value of the parameters “MotorOpUBZ” and “Start>power”.

When “MotorOp RS-2/5” = “OnSta” – after energizing UBZ operates in the same way as when the remote control is disabled (normal device operation), but it is enabled to record to the command register R_COMMAND. Automatic motor start is possible only after ARS time.

When “MotorOp RS-2/5” = “OffSta” – UBZ will start the motor only after the receipt of the respective command via RS-232/RS-485 interface.

The value R_COMMAND is taken into account by UBZ operation algorithm when “MotorOp RS-2/5” =“OnSta” and “MotorOp RS-2/5” = “OffSt”. If “MotorOp RS-2/5” = “Off” and the user sets “MotorOp RS-2/5” “OnSta” or “MotorOp RS-2/5” = “OffSt”, then in R_COMMAND zero (0) will be recorded.

The list of possible register setup of commands is shown in Table 5.12.

When “MotorOp RS-2/5” = “OnSta”, then after energizing in the command register 1 is recorded (normal device operation).

When “MotorOp RS-2/5” = “OffSt”, then after energizing in the command register 0 is recorded (motor is disabled prior to entering the command to enable).

In case of emergency shutdown of the motor by simultaneously pressing DOWN, UP (when “MotorOp UBZ” = 2 (“Stop”) or “MotorOp UBZ” = 3 (“St<>”), 0 will be reset in the command register.

Table 5.12 – Values of command register (Address = 903)

Command register R_COMMAND	Action fulfilled
0	Turn off the motor. If the motor is turned off, before receiving a command from the remote control to turn on the motor will not turn on. If the motor is on, the motor will be off.
1	Normal operation of the device. If the motor has been disabled by the command of the remote control or by simultaneous pressing DOWN, UP when “MotorOp UBZ” = 3 (“St<>”) or when fault occurs, after which ARS is possible, then enabling the motor when 1 record to R_COMMAND will happen after ARS time from the moment the motor is turned off.
2	The early motor switching on. Record 2 turns on the motor before the ARS time finishes. After the motor enabling R_COMMAND = 1.
55 (37 Hex)	Command “FAULT RESET” (Section 5.4.10)
88 (58 Hex)	Command “UBZ RESTART” (“RESTART”) (Section 5.4.11)

5.4.10 Command “FAULT RESET”

Command “FAULT RESET” is fulfilled after recording the command code 55 in the command register (Table 5.12) via RS-232/RS-485 interface.

When the command is fulfilled:

all faults are reset (whether ARS is disabled or enabled);
ARS count ends;
if there is no current fault, the motor is enabled.

5.4.11 Command “UBZ RESTART” (“RESTART”)

Command “UBZ RESTART” is used for entering into effect of the changed parameters of communication.

Command “UBZ RESTART” is fulfilled after record of command code 88 in the command register (Table 5.12) via RS-232/RS-485 interface. After receiving Command “UBZ RESTART”, UBZ does not return confirmation of received command.

5.4.12 UBZ factory settings using MODBUS interface

To do this, you need to set the parameter “Default Factor” = 1. In this case the operation parameters of the serial interface will not change (reset of interface settings to factory settings is not performed). The execution time of reset to the factory setting is up to 5 seconds. After the operation finished the parameter “Default Factor” = 0.

5.5 Emergency Conditions System

In case of emergency state of UBZ:

in the fourth line of the indicator the alarm message displays (Figure 5.16) (fault code corresponds to Table 5.13);
red LED “FAULT” is on (with constant light if ARS is disabled and with flashing, if ARS is expected);
the load relay is disabled;
functional relay is activated (when “Relay F Mode” = “Alarm”).

UBZ Indicator in fault conditions

Figure 5.16 – UBZ Indicator in mode of view for measured and calculated parameters (if there is a fault)

If UBZ defines several different types of faults at the same time, the codes of faults and parameter values are displayed sequentially, one by one (on the indicator the number of displayed fault is changed).

If ARS is enabled, then in the fourth line of the indicator alternately the codes of faults and the time in seconds remaining until ARS are shown (Figure 5.17) (if the waiting time for thermal overload of the motor is more than the ARS time, then the waiting time is displayed). If ARS is disabled, the state of ARS in the fourth line is not displayed.

Indicator showing ARS time

Figure 5.17 – Indicator when displaying the time remaining until ARS

Table 5.13 – Fault codes

Fault description	Fault mnemonics	Parameter value	Param. addr.	Fault code	Register address
Maximum phase current	I max	Maximum phase current	300	0	901:0
Thermal overload	Thermal over		301	1	901:1
Ground fault (zero sequence current)	Iearth	Zero sequence current	302	2	901:2
Excess ratio of negative sequence current to negative sequence voltage	Coef I/U	Coefficient of negative sequence current ×100	303	3	901:3
Negative sequence current	I2 rev	Negative sequence current	304	4	901:4
Minimum phase current	I min		305	5	901:5
Delayed start	Long Start	Current	306	6	901:6
Rotor blocking	Block Rot	Current	307	7	901:7
Upon reaching the temperature threshold of the first transmitter	Temp1	Temperature in degrees	308	8	901:8
Upon reaching the temperature threshold of the second transmitter	Temp2	Temperature in degrees	309	9	901:9
Phase sequence	Phase Sequen		310	10	901:10
External MS (the presence of currents when load relay is disabled)	Contactor	Current	311	11	901:11
At minimum line voltage	U min	Voltage	312	12	901:12
At maximum line voltage	U max	Voltage	313	13	901:13
At phase imbalance	Uimbal	Imbalance	314	14	901:14
Minimum insulation resistance of motor winding	Insul Res	Insulation resistance	315	15	901:15
Mains minimum frequency	F min	Frequency	316	16	902:0
Mains maximum frequency	F max	Frequency	317	17	902:1
Fault of remote control channel	Remote Cont			18	902:2
Motor emergency shutdown without possibility for restart	Stop nAR			19	902:3
Motor emergency shutdown with possibility to restart by simultaneously pressing the buttons UP and DOWN	Stop Motor			20	902:4
s.c. of temperature transmitter 1	Short TempS1			21	902:5
Breakout of temperature transmitter 1	Break TempS1			22	902:6
s.c. of temperature transmitter 2	Short TempS2			23	902:7
Breakout of temperature transmitter 2	Break TempS2			24	902:8
Loss of phase	Break Phase			25	902:9
EEPROM destruction	Error EEPROM			26	902:10
At analog input “0-20 mA”	Input I		327	27	902:11
At analog input “0-10 V”	Input U		328	28	902:12
Improper calibration	Error CALIB			29	902:13

Notes:

Occurrence of fault as “EEPROM Error” – the destruction of EEPROM indicates that the data of the programmed parameters (Table 3.6) is damaged. To continue the operation, it is necessary to turn off UBZ and restore the factory settings (5.2.7 – second method).
Occurrence of fault as “Error CALIB” – UBZ improper calibration means that the calibration coefficients of the measured data are damaged. The continued operation of UBZ is impossible. Re-calibration of the device is required to be done at the manufacturer factory.

5.6 Emergency Conditions Logbook

When disabling the load relay in the event of fault, UBZ records in its memory the code of the fault, the value of the parameter on which the fault occurred and time of occurrence.

Number of simultaneously stored fault codes is 50. In case of subsequent faults occur, the fault information is recorded in place of the oldest fault.

To view the log, it is necessary to press button RES/MEM/SEL.

Red LED SETUP will on in flashing mode, and UBZ indicators will display the latest fault (Figure 5.18).

Fault logbook display

Figure 5.18 – Display in the view mode of the fault logbook

Line 1 – indication of mode (alarm logbook)
Line 2 – number of the fault (1 – means the most recent fault)
Line 3 – mnemonic of the fault as per Table 5.13 and the parameter value at the moment of the fault occurrence
Line 4 – time and date of the fault

View the fault logbook by pressing the UP or DOWN button.

To exit the view log mode, press the button RES/MEM/SEL or exit will be automatically in 30 seconds after the last pressing of any button.

5.7 Motor control on UBZ front panel

Depending on the value of the parameter “MotorOp UBZ”, you can control the load relay of UBZ by simultaneously pressing the UP and DOWN buttons:

“Off” - no reaction;
“Start” (motor start is enabled) - the load relay will enabled if ARS time has not finished;
“Stop” (motor emergency shutdown) - the load relay will disabled with the issuance of fault code “Stop nAR”). The restart of the motor is possible only after de-energizing and re-energizing of UBZ device;
“St<>” (motor start and shutdown is permitted) - the load relay is disabled with issuance of code “Stop Motor”. To enable it, press again UP and DOWN buttons.

5.8 Motor control using analog inputs

The motor control algorithms by the analog inputs “0-20 mA” and “0-10 V” are shown in Table 3.6.

After the motor stopping according to emergency level the countdown for ARS will only start after going out the parameter value of the emergency zone.

If after the motor switching off by the alarm level the parameter value is between the levels on and off for the motor, then:

green LED “Power relay” blinks;
red LED “FAULT” is off;
the fault code is displayed on LCD.

6. Maintenance

6.1 Safety precautions

Maintenance of the device should be performed by persons admitted to the operation and have the appropriate permission. The recommended frequency of maintenance is every six months.

6.2 Maintenance Procedure

check the wires connection reliability, if necessary – clamp with force as specified in Table 3.1;
check visually the housing integrity;
if necessary, wipe with cloth the front panel and the device housing.

It is not allowed to clean the device with abrasive materials or organic compounds (alcohol, gasoline, solvents, etc.).

7. Transportation and Storage

UBZ-304 in the original package of the Manufacturer should be stored indoors with temperature from minus 45 to +60°C and relative humidity of not more than 80% in the absence of vapors harmfully acting on the packaging and materials of the device.

8. Service Life, Shelf Life and Manufacturer Warranty

8.1 The device service life is 10 years. Upon expiration of the service life you should contact the Manufacturer.

8.2 Shelf life is 3 years.

8.3 Warranty period of the device operation is 5 years from the date of sale.

During the warranty period the Manufacturer is responsible for free repair of the device, if the Consumer has complied with the requirements of this Operating Manual.

8.4 Warranty service is performed at the place of purchase or by the Manufacturer of the device.

8.5 Post-warranty service is performed by the Manufacturer at current rates.

8.6 Before sending for repair, the device should be packed in the original or other packaging excluding mechanical damage.

For all questions, please contact the Manufacturer:

“Novatek-Electro” Ltd.

Website: www.novatek-electro.com

Address: 59, Mykhailo Boltenko (Admiral Lazarev) str., Odesa, Ukraine, 65007

Tel: +38 (067) 565 37 68; +38 (050) 359 39 11; +38 (063) 301 30 40