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NJBK6 Datasheet Preview

NJBK6 Datasheet

Motor Protection Relay

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NJBK6 pdf
Relay
Protection Relay
NJBK6 Series
Motor Protection Relay
1. General
NJBK6 series motor protection relay is used to provide
overload, phase failure, three-phase current unbalance and
locked rotor protection for AC motors with a frequency of
AC 50Hz, a rated insulation voltage of below 690V and a
rated operational current of 1A~36A that operate
continuously or intermittently.
Standards: IEC 60947-4-1
2. Type designation
N JBK 6 - 36 / □ / □ / □
Type of operation delay
Rated control supply voltage
Setting current code
Frame size
Design sequence No.
Motor protection relay
Company code
3. Operation conditions
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:
I
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NJBK6 Datasheet Preview

NJBK6 Datasheet

Motor Protection Relay

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NJBK6 pdf
4. Technical data
4.1 Main data and technical characteristics
Relay
Protection Relay
No.
NJBK6-36/3//
NJBK6-36/9//
NJBK6-36/24//
NJBK6-36/36//
Setting current range
1A~3A
3A~9A
8A~24A
12A~36A
Model of matching contactor
CJX2-25/NC1-25
CJX2-25/NC1-25
CJX2-25/NC1-25
CJX2-32/NC1-32
Matching motor power
0.5kW~1.5kW
1.5kW~4.5kW
4kW~12kW
6kW~18kW
4.2 Technical data of main circuit
Rated operational current: 1A~36A, rated insulation voltage: 690V, rated frequency: 50Hz;
4.3 Technical data of control circuit
Number of contacts: 1 group of change-over contacts;
Contact capacity: Ue/Ie: AC-15 380V/0.95A, 240V/1.5A; Ith: 5A;
Rated frequency: 50Hz
4.4 Technical data of auxiliary circuit
Control supply voltage: AC 220×(1±10%)V, AC 380×(1±10%)V;
Rated frequency: 50Hz
4.5 Operating characteristics
4.5.1 The operating characteristics of overload protection are given in Table 2.
No.
Setting current
multiple
Operation time
Starting conditions
Starting conditions
1
1.05
No operation within 2h
Cold state
+20
2
1.2 Operation within 2h Hot Start
+20
3
1.5 Operation within 2min Hot Start
+20
4
7.2 2s<Tp10s Cold state
+20
4.5.2 Operating characteristics of phase failure protection
In case of failure of any phase of the three-phase current of the main circuit, the protector operates for a period of 5s.
4.5.3 Operating characteristics of three-phase current unbalance protection
When the three-phase current of the main circuit meets the following two formulas, the protector operates for a period of ≤5s.
Imax-Imin
Iavr ×100%>30%
Imax≥0.5×Iset
where: Imax: Max. current value of the three-phase current;
Imin: Min. current value of the three-phase current;
Iavr: average value of the three-phase current;
Iset: setting current value.
4.5.4 Operating characteristics of locked rotor protection
The locked rotor current is set to 6Ie in the protector. When the current of the main circuit is greater than the locked rotor current,
the protector operates for a period
of ≤10s after a delay.
4.6 Reset characteristics
After the operation of the protector, if the control supply voltage is normal, the protector can be reset manually; if the control supply
voltage is off, the protector resets immediately.
5. Connection diagram
The connection diagrams in case the control supply voltage is AC220V and AC380V are shown in Figure 2 and Figure 3.
L3 L2 L1 N
FU1
QS
W1 V1 U1
W2 V2 U2
KM
W3 V3 U3
QF1
FU2
W4 V4 U4
M
3~
STP ST
KM
95 A1
QF1
96 A2
KM
L3 L2 L1 N
FU1
QS
W1 V1 U1
W2 V2 U2
KM
W3 V3 U3
QF1
FU2
W4 V4 U4
M
3~
STP ST
KM
95 A1
QF1
96 A2
KM
I-17
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Part Number NJBK6
Description Motor Protection Relay
Maker CHiNT
Total Page 3 Pages
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