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

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

With adjustable voltage asymmetry trip threshold. 1 x NO/NC contact.

The CKF-BR 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. The CKF-BR-TrueRMS also controls the phase sequence of the power supply, preventing the motor from spinning in the wrong direction

Operation
A voltage lossin at least one phase of any phase or a voltage asymmetry between phases above the trip 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:

CKF-BR-TRMS F&F