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NJBK7 Datasheet Preview

NJBK7 Datasheet

Motor Protection Relay

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NJBK7 pdf
2. Type designation
N JBK 7 - 800 / □
Relay
Protection Relay
NJBK7 Motor protection delay
1. General
NJBK7 series motor protection relay (hereinafter
referred to as protector) is used to provide overload, locked
rotor, phase failure, three-phase current unbalance, ground
and PTC temperature protection for AC motors with a
frequency of AC 50Hz, a rated insulation voltage of up to
690V and a rated operational current of 80A-800A that
operate continuously or intermittently. The protector uses
flexible Rogowski coil to acquire current and features wide
setting current range, high accuracy and convenient
installation. The protector has RS485 interface and 4mA-
20mA analog transmission interface, permits network
communication and can realize remote monitor and
control and fault inquiry of motors by means of upper
computer. The protector is genenrally used in combination
with AC contactor.
Standards: GB 14084.4, IEC 60947-4-1.
Rated control supply voltage
(AC220, AC380, AC/DC100V-240V)
Specification code
Design sequence No.
Motor protection relay
Company code
3. Technical data
3.1 Altitude: should not exceed 2000m;
3.2 Ambient tempeature: -5~+40, and the average
temperature in 24h should not exceed +35;
3.3 Atmospheric conditions: The relative air humidity should not
exceed 50% at the maximum temperature of +40. The
relative humidity may be higher at lower temperatures, for
example, the air humidity can be up to 90% at +20. Special
measures should be taken if condensation occurs on the product
occasionally due to temperature variation;
3.4 Pollution degree: 3;
3.5 The inclination between the mounting plane and the vertical
plane should not exceed ±5°;
3.6 In non-explosive media that do not contain a sufficient
amount of gas or conductive dust to cause metal corrosion or
insulation failure;
3.7 In places with rain and snow protection equipment and not
full of vapor;
3.8 In places where there is no significant shake, impact or
vibration;
3.9 Mounting category: Ⅲ;
3.10 Degree of protection of enclosure: Ip20.
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CHiNT

NJBK7 Datasheet Preview

NJBK7 Datasheet

Motor Protection Relay

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NJBK7 pdf
Relay
Protection Relay
4. Main data and technical characteristics
4.1 Main circuit: rated insulation voltage: AC690V, rated frequency: 50Hz
Model
NJBK7-800/
Setting current (A)
800
Setting current range (A)
80~800
Matching motor power (kW)
40~400
4.2 Auxiliary circuit: rated insulation voltage: AC380V, rated frequency: 50Hz, data of auxiliary contact
Usage category
Rated operational voltage Ue(V)
Rated operational current Ie(A)
Conventional heating current Ith(A)
240
1.5
AC-15
5
380
0.95
4.3 Structural features
4.3.1 Split mounting;
4.3.2 LCD display, key setting;
4.3.3 Has start delay function;
4.3.4 Has fault memory function, permits inquiry of fault record;
4.3.5 Has RS485 interface, supports MODBUS protocol, permits network communication;
4.3.6 Has 4mA-20mA analog output interface;
4.3.7 Has two groups of output contacts, 1Z protection contact and 1H auxiliary contact, and permits autotransformer reduced voltage
starting and star-delta starting;
4.3.8 Power consumption: ≤3VA.
5. Protection charactersitics
5.1 Operating characteristics of overload protection
Overload
curve
Kr=1
Kr=2
Kr=3
Kr=4
Kr=5
Overload multiple
Operation
time (s)
1.1 1.2 1.5
2
5
6 7.2
75 63 40 22 3.6 2.5 1.8
150 125 80 45 7.2 5 3.5
298 250 160 90 14 10 6.9
595 500 320 180 29 20 14
892 750 480 270 43 30 21
Note
In conformity with Class 10A
In conformity with Class 10
In conformity with Class 20
In conformity with Class 30
5.2 Operating characteristics of phase failure protection
When the current of any phase of the three-phase current of
the main circuit is equal to zero, the protector operates for a
period of ≤5s.
5.3 Operating characteristics of three-phase current unbalance
protection
When the three-phase current of the main circuit meets the
following formula, the protector operates for a period of ≤5s.
Imax-Imin
Imax ×100% set current unbalance rate
Imax: Max. phase current value
Imin: Min. phase current value
5.4 Operating characteristics of ground protection
When zero sequence current set ground protection
current value, the protector operates for a period of ≤1s.
5.5 Operating characteristics of locked rotor protection
When Max. phase current setting current value×set
locked rotor multiple, the protector operates for a period of
1s.
5.6 Operating characteristics of temperature protection
The over-temperature protection function of the protector is
accomplished by detecting the resistance of the PTC thermistor
preembedded in the motor stator widing. When the resistance
of the PTC thermistor ≥2.5kΩ, the protector operates for a
period of ≤1s.
5.7 Communication: The protector provides RS485 interface and
supports MODBUS protocol.
Tripping characteristic curve
100min
50min
20min
10min
5min
2min
1min
5S
2S
1S
1
2
Kr=5
Kr=4
Kr=3
Kr=2
Kr=1
58
×Iset
I
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Part Number NJBK7
Description Motor Protection Relay
Maker CHiNT
Total Page 4 Pages
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