Phase sequence and phase loss sensor 1xNO CKF TRMS F&F

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

The CKF TrueRMS phase sequence and phase loss sensor is designed to protect electric motors supplied from a three-phase network in cases of voltage loss in at least one phase or voltage asymmetry between phases, threatening to destroy the motor, and to protect the direction of motor rotation in case of phase change in front of the sensor

Operation
A voltage failure in at least one phase of any phase or voltage asymmetry between phases above the tripping threshold will cause the motor to shut down. 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. Reconnection 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
Contact separation	YES
Tripping voltage asymmetry	45 V
Voltage hysteresis	5 V
Cut-off delay	4 s
Power control	2 × LED
Connection	OMY 4×1 mm²; 2×0.75 mm², l: 0.5 m
Power consumption	1,6 W
Operating temperature	-25÷40°C
Dimensions	51×67×26 mm (± 1 mm)
Mounting	surface mounted
Protection class	IP20
TrueRMS	YES

CKF-TRMS F&F