Phase sequence and phase loss sensor 1xNO/NC CKF-316 TRMS F&F

With fixed voltage asymmetry tripping threshold. 1 x NO/NC contact.

The CKF-316 TrueRMS phase sequence and phase loss sensor is designed to protect electric motors supplied from three-phase mains. The phase sequence and phase loss sensor will trip if there is a voltage loss in at least one phase or if there is voltage asymmetry between phases. That is, when there is a danger of destroying the motor. The CKF-316-TrueRMS also controls the order of the power supply phases, preventing the motor from spinning in the wrong direction

Operation
A voltage failure in at least one phase of any phase or a voltage asymmetry between phases above the trip threshold will cause the motor to shut down. The shutdown will occur with a delay of 4 s, which prevents accidental disconnection of the motor during a momentary voltage drop. Reconnection will occur automatically when the voltage rises by 5 V above the trip voltage (i.e., by the voltage hysteresis value). With the above anomalies, it is impossible to start the motor. In the event of a change in the sequence of phases in front of the sensor causing an undesirable change in the direction of rotation of the motor, the sensor will not allow the motor to start. Restarting is possible after the return of the correct phase order.

Thanks to the measurement of the real effective voltage value (TrueRMS), the sensor guarantees correct operation even in case of operation in a heavily disturbed power supply network.

Technical data:

Supply voltage	3 × 400 V + N
Cooperation with power generators	NO
Phase loss / asymmetry control	YES
Phase sequence control	YES
Contactor contact monitoring	NO
Executive element	relay
Maximum load current	10 A
Contact configuration	1 × NO/NC
Contact separation	YES
Tripping voltage asymmetry	55 V
Voltage hysteresis	5 V
Cut-off delay	4 s
Power control	2 × LED
Connection	screw terminals 2.5 mm²
Tightening torque	0.4 Nm
Power consumption	1,6 W
Operating temperature	-25÷40°C
Dimensions	1 module (18 mm)
Mounting	on a 35 mm rail
Protection class	IP20
TrueRMS	YES

CKF-316-TRMS F&F