Novatek UBZ-305 User manual

NOVATEK-ELECTRO LTD
Intelligent Industrial Electronics
UNIVERSAL MOTOR PROTECTION
UNIT
UBZ-305
OPERATION MANUAL
TECHNICAL PASSPORT
The quality management system of production complies with the requirements of
DSTU ISO 9001:2009 (ISO 9001:2008), No. UA 2.032.7110-12
Odessa www.novatek-electro.com

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UBZ-305 NOVATEK-ELECTRO
CONTENT
1 APPLICATION
4
1.1 General
4
1.2 Operating conditions
5
1.3 Changes in the characteristics and operation of UBZ depending on program
version
5
1.4 Controls and overall dimensions
5
1.4.1 Design
5
1.4.2 Displays and controls
6
2 SPECIFICATIONS
7
2.1 Basic technical specifications
7
2.2 Measured, calculated, special and service parameters
8
2.3 Programmable parameters
10
2.4 Protection functions
16
2.4.1 Protection types
16
2.4.2 Maximum phase current protection
17
2.4.3 Ground fault protection
17
2.4.4 Negative-sequence current protection (imbalance)
17
2.4.5 Minimum phase current protection
18
2.4.6 Delayed start and rotor blocking
18
2.4.7 Thermal overload protection
19
2.4.8 Windings overheating protection
19
2.4.9 Voltage protection
20
2.4.10 Phase sequence protection
20
2.4.11 Network power frequency drop protection
20
2.4.12 Network power frequency rise protection
20
2.4.13 Protection for minimum resistance of motor winding insulation
20
2.4.14 Protection for motor phase (-s) break (loss)
20
2.4.15 Serviceability check of external magnetic starter
20
2.5 Selection of current transformers
20
3 UBZ DESIGN
21
4 SAFETY PRECAUTIONS
21
5 INTENDED USE
21
5.1 Safety precautions
21
5.2 UBZ preparation for use
21
5.3 UBZ control
23
5.3.1 Modes of UBZ control and status
23
5.3.2 Measured and calculated parameters view state
24
5.3.3 Mode of keyboard blocking
24
5.3.4 Mode of minimum number of settings
25
5.3.5 Mode of user level
25
5.3.6 Mode of advanced user level
26
5.3.7 Factory settings
26
5.3.8 Current time setting
26
5.3.9 UBZ faults reset on front panel
27
5.3.10 Energy meters reset
27
5.4 UBZ operation
27
5.4.1 UBZ operation before load relay on
27
5.4.2 UBZ operation after load relay and motor on
28
5.4.3 Functional relay operation
28
5.5 Operation of UBZ together with computer
28
5.5.1 Communication protocol and interface
28
5.5.2 Communication parameters
29
5.5.3 Communication protocol
29
5.5.4 Command codes
30
5.5.5 Control of correct transmission of data packet
32
5.5.6 Register addresses
32
5.5.7 Time parameter registers
33
5.5.8 Communication errors handling
33
5.5.9 Remote control of the motor using RS-232/RS-485 interface
34

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NOVATEK-ELECTRO UBZ-305
5.5.10 Command for UBZ FAULTS RESET
35
5.5.11 Command for UBZ RESTART
35
5.5.12 UBZ factory settings using MODBUS interface
35
5.6 Emergency conditions system
35
5.7Emergency conditions logbook
37
5.8 Motor control on UBZ front panel
37
5.9 Motor control using analog inputs
38
6 COMPONENTS
38
7MAINTENANCE
38
8TRANSPORTATION AND STORAGE
38
9SERVICE LIFE, SHELF LIFE AND MANUFACTURER WARRANTY
38
10 ACCEPTANCE CERTIFICATE
39
11 CLAIMS DATA
39
Appendix А–Current protection with dependent time delay
Appendix В–UBZ operation for motor control with winding changeover when star-to-delta
starting.

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UBZ-305 NOVATEK-ELECTRO
This Operation Manual is intended to familiarize you with the unit, the requirements for safety, operation
and maintenance procedures of the universal motor protection unit of UBZ-305 (hereinafter referred to as
UBZ).
ATTENTION!
ALL REQUIREMENTS OF THIS OPERATION MANUAL ARE COMPULSORY TO BE MET!
The product meets the requirements:
UBZ complies with the requirements of the following international standards:
–IEC 60947-1, Low-voltage Switchgear and Control-gear; Part 1: General Rules;
–ІEC 60947-6-2:1992, Low-voltage switchgear and control gear –Part 6-2: Multiple function equipment -
Control and protective switching devices (or equipment)
–CISPR 11:2004, Industrial, scientific and medical (ISM) radio-frequency equipment - Electromagnetic
disturbance characteristics –Limits and methods of measurement
–IEC 61000-4-2:2001, Electromagnetic compatibility (EMC) –Part 4-2: Testing and measurement
techniques –Electrostatic discharge immunity test
Note: The product characteristics comply with both international standards and corresponding national
standards.
Harmful substances in amounts exceeding maximum permissible concentrations are not available.
INSTALLATION, ADJUSTMENT AND MAINTENANCE OF THE UNIT SHOULD BE PERFORMED ONLY
BY SKILLED PERSONNEL WHO THOROUGHLY STUDIED THIS OPERATION MANUAL.
In compliance with the requirements of this Operation Manual and regulations the product is safe
for use.
Abbreviations and terms:
ARS –Automatic restarting;
MS –Magnetic starter;
PC- Personal computer;
CТ - 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 CТis 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 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 unit 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 380V, 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;

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NOVATEK-ELECTRO UBZ-305
-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.
Note: Simultaneous use of RS-485 and RS-232 is not possible.
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 (http://www.novatek-electro.com/production_ubz.htm).
UBZ-304/305 Control Panel program is designed to monitor the status and collect data of the UBZ-305 unit
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 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%.
ATTENTION!
The product is not intended for use:
- in conditions of significant vibration and shocks;
- in high humidity conditions;
- in corrosion environments with content in the air of acids, alkalis, etc., as well as severe contamination
(grease, oil, dust, etc.).
If the temperature of the unit 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 unit in operation
conditions for two hours (because on the unit elements condensation may be available).
1.3 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.
1.4 Controls and Overall Dimensions
1.4.1. Design
Overall dimensions of UBZ are given in Fig.1.1.

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UBZ-305 NOVATEK-ELECTRO
Fig.1.1 –Overall Dimensions of UBZ
1.4.2 Indication and Controls
Controls of UBZ are given in Fig.1.2.
1 –Green LED "Function" is on when functional relay is on;
2 –Green LED “Motor”:
- is on when load relay is enabled;
- flashes if UBZ is within hysteresis band when controlling using analog inputs;
3 –Green LED " " is on when UBZ functional relay operates in start-delta mode (it.2.5.3);
4 –Green LED "TR" is on when UBZ functional relay operates in time-delay relay mode;
5 –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;
6 –Blue LED " " is on when data exchange with PC occurs;
7 –Connector for UBZ to a PC via RS-232;
8 –Button (UP) is scrolling of displayed parameters in the parameter view mode and scrolling of the
menu in the parameters setting mode;
9 –Button (DOWN) is scrolling of displayed parameters in the parameter view mode and scrolling of the
menu in the parameters setting mode;
10 –Green LED "MMSP" is on when the relay is in MNS mode;
11 –Button "WR/SEL" is the parameters recording in the setting mode, switching over the group of displayed
parameters in the view mode, reset;
12 –Button "SETUP" turns on the parameters setting mode;
13 –Red LED "SETUP" is on when UBZ is in the mode of parameters setting;
14 –LCD. Fig.1.2–Controls of UBZ

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NOVATEK-ELECTRO UBZ-305
2 SPECIFICATIONS
2.1 Basic Technical Specifications
Basic technical specifications of UBZ are given in Tables 2.1 and 2.2; specifications of contacts of built-in
relays are shown in Table 2.3.
Table 2.1 –General Data
Table 2.2 –Technical Specifications
Description
Value
Operating supply voltage, three-phase
380 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
- line voltage, when powered by three phases, not more, V
180
450
Analog inputs:
- input to connect temperature transmitter (types: Pt100, Ni100, Ni120);
- input to connect temperature transmitter of PTC-1000 type;
- three analog inputs for standard CT with 5A output (T-0.66 type or similar);
- input to connect differential current transformer (zero sequence transformer);
- input to measure current of 0-20 mA;
- input to measure voltage of 0–10 V.
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 - 16A, 250V 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), not more, VA
5.0
Weight, not more, kg
0.34
Overall dimensions (Fig.1.1), H*B*L, mm 91*157*58
Position in space free
Housing material self-extinguishing plastic
Description
Unit of
measure-
ment
Value
Application of the unit
-
Switchgear and control-gear;
induction motor protection control;
Design (installation) type
DIN rail 35 mm
Protection level
-
IP20
Climatic version
UHL 3.1
Operating temperature range*
°С
from minus 20 to +55
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
*Note: It is allowed UBZ operation at temperatures from minus 35 to minus 20°С; in this case the readings on
display can be not available.

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UBZ-305 NOVATEK-ELECTRO
Table 2.3 –Characteristics of built-in relay output contacts
Relay
Max.
current at
U~250V
Number of
actuations
х1000
Max. switching
power
Max. continuous
boosting AC / DC
voltage
Max. current
at Ucont=30V
Functional relay
Cos = 0.4
Cos = 1.0
5А
16А
100
100
4000 VА
440/300 V
5 А
Load relay
Cos = 0.4
Cos = 1.0
2А
8А
100
100
2000 VА
460 V
3 А
2.2 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 2.4.
Measured and calculated parameters the values of which are displayed on LCD display, limits of their
measurements and accuracy are given in Table 2.5.
Parameter values can be transferred to PC connected to one of the UBZ interfaces (MODBUS, RS-232).
Parameter addresses are indicated in Table 2.5.
Table 2.4 –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 (it
2.4.7)
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 number of
faults will reach 50, the count of faults will begin again
from scratch.
Read-only
parameter
75
Table 2.5 –Measured and Calculated Parameters
Measurement functions
Range
Accu-
racy
Mnemonic
Address
Data transfer
units
Currents
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.
Reset of all average values is performed by the
button WR/SEL in case of displaying the
maximum value of average current in any
phase (by indication of the present average
current of the respective phase).
<3 Iсt
> 3 Iсt
2%
10%
Peak i1
Peak i2
Peak i3
39
40
41
Motor starting current (average phase current)
Overload current (average phase current)
Starting time, s
Starting time is the period of time from when all
three-phase current will exceed 1.2 In and up to
the moment when three currents will drop lower
than 1.2 In. Maximum phase current achieved
during this period is the maximum starting current.
<3 Iсt
> 3 Iсt
0.1 –600
2%
10%
Start i
Overload i
Start time
42
43
44
Voltage
Effective values of phase voltages (determined
when connecting the neutral conductor to UBZ), V
100 –
300
3V
Phase U1
Phase U2
45
46
Volt

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NOVATEK-ELECTRO UBZ-305
Table 2.5 (Continued)
Measurement functions
Range
Accu-
racy
Mnemonic
Address
Data transfer
units
Phase U3
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), (it is defined
when connecting to the neutral wire of UBZ), V
3 –100
3V
Zero sU
53
Miscellaneous
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 trip (it indicates the time
remaining until shutdown made by thermal
overload protection)3, s
0 –600
1 s
Before
OvL
58
Second
Waiting time after overload trip (it indicates
waiting time before permit to start-up blocked
by thermal overload protection)3, 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
minus 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
minus 40
–220
1°C
Temp
dat 2
70
Current value at analogue input "4-20 mA", mA
0 –25
2%
Input i
71
Voltage value at analog input "0-10 V", V
0 –10
2%
Input U
72
Full electric power6, kVA/h
0 –
200000000
5%
ApE
90
91
Active electric power6, kW/h
0 –
200000000
5%
AcE
92
93
Reactive electric power6, kVAr/h
0 –
200000000
5%
ReE
94
95
Notes:
1If 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).
2If ARS is disabled, the indicator displays “not”.
3If 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”.
4If the power consumed by the load is more than 999 kW (kVA, kVAr), the values of power are displayed with MW
(MVA, MVAr).
5If the temperature value exceeds specified limits, then the indicator displays the alarm code in accordance with
table 5.12. If the temperature sensor is disabled by software, then the indicator instead of temperature values
displays “Off”.
6In 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.

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UBZ-305 NOVATEK-ELECTRO
2.3 Programmable Parameters
Programmable parameters and their variation limits are given in Table 2.6.
Table 2.6 –Programmable Parameters
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
(it. 5.3.8)
See Table
5.9
Transformers
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
Rated current of motor,
A
Rated
Inоm
0
630
0
0 –current is not set: UBZ will not
enable the load relay (it.5.2.7).
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 2.4).
153
Over-current protection
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
10.0
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" –tipping 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)
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
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,
164

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NOVATEK-ELECTRO UBZ-305
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
ARS is enabled.
Analysis of causes for negative sequence current tripping
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)
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
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
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
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

~ 12 ~
UBZ-305 NOVATEK-ELECTRO
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
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
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
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
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
197

~ 13 ~
NOVATEK-ELECTRO UBZ-305
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
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".
Permit for motor
operation after UBZ
energizing
Start>Pow
er
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 star is
enabled;
2 –"Stop" –motor emergency
shutdown is enabled;
3 –"St<>" –motor start-up and
shutdown is enabled.
See it.2.9
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
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 Ohm);
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

~ 14 ~
UBZ-305 NOVATEK-ELECTRO
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
Motor insulation resistance
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
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 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
See it.2, it.3 of the parameter
“Relay F mode“ (address-214).
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 unit
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

~ 15 ~
NOVATEK-ELECTRO UBZ-305
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
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)
UBZ communication
address
Address
UBZ
1
247
1
222
Transfer rate2
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
Overexce
eding
0
120
0
0 –It is disabled.
225
Permit of UBZ
communication via
serial link
Communi
cation
0
2
0
0 –"Off " –communication is
disabled;
1 –"RS232" –communication
via RS-232;
2 –"RS485" –communication
via RS-485.
226
Type of communication
protocol2
ASCII-
RTU
0
1
1
0 –"ASCII";
1 –"RTU" –MODBUS modes.
227
Parity check2
Even
parity
0
1
0
0 –"Off" –parity check is disabled;
1 –"On" –parity check is enabled.
228
Number of stop bits2
Stop bit
1
2
2
229
Unit version
Version
8
The parameter value depends
on software version.
230
Indicator illumination1
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
Upper threshold, mA
Input I UP
0
20
10
233
Lower threshold, mA
Input I
DOWN
0
20
1
234
Control algorithm
Input I
ALG
0
2
0
0 –"Off" –control is off;
1 –"OffUP" –the motor is off
when the current is higher than
235

~ 16 ~
UBZ-305 NOVATEK-ELECTRO
Table 2.6 (Continued)
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
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.
Entry in faults logbook
Input I log
0
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
Upper threshold, V
Input U
UP
0
10
5
237
Lower threshold, V
Input U
DOWN
0
10
1
238
Control algorithm
Input U
ALG
0
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
0
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
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:
1 –Indicator light turns off if the line supply voltage is lower than 250 V.
2 –Parameter change will happen after turning off and repeated energizing or fulfillment of "UBZ RESTART"
command
2.4 Protection Functions
2.4.1 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);

~ 17 ~
NOVATEK-ELECTRO UBZ-305
–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).
2.4.2 Maximum phase current protection is of three-phase type.
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 А.
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.
Fig.2.2 –Principle of protection with definite 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:
Fig.2.3 –Principle of protection with dependent time delay
Appendix Аprovides 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).
2.4.3 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).
2.4.4 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:

~ 18 ~
UBZ-305 NOVATEK-ELECTRO
K2Ui=
2(1)
1(1) 100
i
i
U
U
,
Where:
U2(1)i—RMS value of negative voltage sequence of fundamental frequency of three-phase voltage system
in i- observation, V;
Ul(l)i. —RMS value of positive voltage sequence of fundamental frequency in i- observation, V.
U2(1)iis calculated by the approximate formula:
U2(1)i=0.62(Uнб(1)i) –Uнм(1)i),
where - Uнб(1)i, Uнм(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 K2Ii 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 (K2Ii / K2Ui). And if the ratio is more than the value of “A-s I2 coef”
parameter, then UBZ considers that the motor has malfunction.
2.4.5 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).
2.4.6 Delayed start and rotor blocking
The principle of delayed start protection and rotor inter-blocking is given in Fig.2.4.
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).
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).
Fig. 2.4 –Delayed start and rotor blocking

~ 19 ~
NOVATEK-ELECTRO UBZ-305
2.4.7 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 Fig.2.5.
For the standard recommended T2 value (60 s at 2 time overload) Table 2.7 shows the following current-
time characteristic.
Table 2.7
I/Inom
1.1
1.2
1.4
1.7
2
2.7
3
Тsec
365
247
148
88.6
60
36.4
24.6
I/Inom
4
5
6
7
8
10
15
Тsec
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 unit because in the intermittent mode of operation UBZ remembers the amount of heat released during
the motor start.
I/Iн – current ratio relative to rated one;
Т/Т2 – the actual response time relative to T2 (response time when double overload).
Fig.2.5 –Current-time characteristic
2.4.8 Windings overheating protection
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).

~ 20 ~
UBZ-305 NOVATEK-ELECTRO
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.
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.
2.4.9 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.
Note –UBZ considers the motor is switched off if the load relay is off (operating in star-delta mode the load
relay and functional relay are disabled), or if the load relay is on, the motor currents are less than 10 percent of
the motor rated current.
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).
2.4.10 Phase sequence protection (“Correct phase” parameter) is enabled in case of improper phase
sequence; it disables the motor and blocks its further operation.
2.4.11 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.
2.4.12 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.
2.4.13 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.
2.4.14 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.
2.4.15 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).
2.5 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 2.8)).