Three-phase asymmetry and sequence monitors CKF

Three-phase asymmetry and sequence monitors CKF

CKF

With fixed actuation threshold voltage asymmetry.
Three phase and sequence monitor is designed to protect tree phase electric motors against voltage drop in at least one phase or voltage asymmetry between phases, which could damage the motor, with additional protection of motor rotation direction in case of phase change before the monitor.


 



 

Functioning
Voltage collapse in any phase or voltage asymmetry between phases above fixed actuation threshhold causes switching-OFF the motor. The motor switching-OFF occurs after delay of 4 sec, which prevents accidental motor switching-OFF caused by instantaneous voltage drop. Switching the motor ON anew occurs automatically when the voltage increases of 5V~ above activation voltage (i.e. about value of voltage hysteresis). At occurrence of these disturbances, it is not possible to  set motor in motion. In case of change of phase sequence, before the monitor, which causes change of motor rotation direction (in relation to that primarily set) is signaled by shining red diode LED along with impossibility of  switching-on the motor. The re-connection is possible after the return to correct phase sequence.
 

Power supply voltage3 ├Ś 400 V + N
Cooperation with power generatorsNO
Phase failure / asymmetry monitoringYES
Phase sequence controlYES
Contactor contact monitoringNO
The executive elementrelay
Maximum load current10 A
Contact configuration1 ├Ś NO
Separation of the contactYES
Voltage asymmetry45 V
Voltage hysteresis5 V
Switch off delay4 s
Power control2 ├Ś LED
TerminalOMY 4├Ś1 mm┬▓; 2├Ś0,75 mm┬▓, l: 0,5 m
Power consumption1,6 W
Working temperature-25├Ě40┬░C
Dimensions51├Ś67├Ś26 mm (┬▒ 1 mm)
Assemblyon wall
Ingress Protection MarkingIP20






System which prevents automatic motor restart after power recovery