Three-phase asymmetry and sequence monitors CKF-317

Three-phase asymmetry and sequence monitors CKF-317

CKF-317, 5908312593171

Product description

With adjustable actuation threshhold at 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.



Voltage collapse in any phase or voltage asymmetry between phases above set value 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 about 5V~ above activation voltage. At occurrence of these disturbances, it is not possible to  set a 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) along with impossibility of switching-ON the motor. The switching-ON is possible after the return to correct phase sequence.

Power supply voltage3 × 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 × NO/NC
Separation of the contactYES
Voltage asymmetry40÷80 V
Voltage hysteresis5 V
Switch off delay4 s
Power control2 × LED
Terminalpluggable terminal blocks 2,5 mm²
Tightening torque0,4 Nm
Power consumption1,6 W
Working temperature-25÷40°C
Dimensions1 module (18 mm)
Assemblyon rail 35 mm
Ingress Protection MarkingIP20

System which prevents automatic motor restart after power recovery