Document
Relay
Protection Relay
NJBK5 Motor Controller
1. General NJBK5 series motor controller (hereinafter referred to as
controller) is mainly used in circuits with a frequency of AC 50Hz (or 60Hz), a rated operational voltage of up to 380V and a rated control power of up to 11kW (current up to 22A) to control the direct start and stop of water pumps or motors, provide motors with overload and phase failure protection, and realize automatic liquid level control for civil water towers and reservoirs.
This product is not applicable to the liquid level control of low-conductivity liquids, such as oil, purified water, inflammable and explosive chemical liquids and highdensity sewage.
Standards: IEC 60947-4-1.
2. Type designation N JBK 5 - □ □ / □ □
Rated operational current
Rated control supply voltage
Function code Blank: with liquid level relay D: without liquid level relay
10: frame size code
Design sequence No.
Motor controller
Company code
3. Operation conditions 3.1 Altitude: the altitude of the mounting location 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 at the mounting location should not exceed 50% at the maximum temperature of +40℃. The relative humidity may be higher at lower temperatures. Special measures should be taken if condensation occurs on the product occasionally due to temperature variation; 3.4 Pollution degree: 3; 3.5 Mounting category: Ⅲ; 3.6 In places where there is no significant vibration or impact; 3.7 In non-explosive media that do not contain a sufficient amount of gas or dust to cause metal corrosion or insulation failure; 3.8 In places where rain and snow protection is provided; 3.9 The inclination from the vertical plane should not exceed 5°.
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> >> I-10
Relay
Protection Relay
4 Technical data 4.1 Main data and technical characteristics
Type
NJBK5-10 0.72A~2.4A NJBK5-10D 0.72A~2.4A NJBK5-10 3.5A~11A NJBK5-10D 3.5A~11A NJBK5-10 10A~16A NJBK5-10D 10A~16A NJBK5-10 20A~25A NJBK5-10D 20A~25A
Conventional heating
current (A)
Max. rated power (kW)
AC-3
380V
220V
Model of matching AC contactor
Model of
Setting
matching
current
motor protector range (A)
Number of turns of
protector (turn)
2.4
1.1 0.55
CJX2-1210
JD-8/0.5A~5A 0.72~2.4
5
12
5.5 3
CJX2-1210
JD-8/2A~20A
3.5~11
1
16
7.5 4
CJX2-1810
JD-8/2A~20A
10~16
1
25
11 5.5
CJX2-2510
JD-8/20A~80A
20~25
1
4.2 Rated control supply voltage Us: AC220V, AC380V. 4.3 Degree of protection of enclosure: IP55. 4.4 Protection characteristics of the controller 4.4.1 Phase failure protection characteristics of the controller: In case of failure of any phase of the three-phase main circuit passing through the center hole of the motor comprehensive protector in the controller, the motor comprehensive protector operates for a period of ≤5s. 4.4.2 Overload protection characteristics of the controller under balanced three-phase load.
No.
Setting current multiple
Operation time
1
1.05
No operation within 2h
2 1.2 Operation within 2h
3
1.5
Tripping class
30
4
7.2
Tripping class
30
4.5 Down-lead distance of liquid level control electrode: 200m max. 4.6 Mounting type: installation type.
Starting conditions
≤12min 9s >>
Relay
Protection Relay
a.Connection diagram of NJBK5-10D in case both the control circuit voltage and the main circuit voltage are AC380V
L1 L2 L3 FU
1/L1 3/L2 5/L3 KM 2/T1 4/T2 6/T3
A1 KM
A2
STP
JD-8
UV W M
3~
96 JD-8
95
14NO 13NO KM
ST
b.Connection diagram of NJBK5-10.