F&F CKF-318 TRMS, Manual

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The correct power supply voltage is indicated by a green LED. 

Voltage drop below 320 V or increase above 480 V for at least 

one phase or voltage asymmetry above the set value is signaled 

by the green LED going off.

Both of the above anomalies (exceeding the voltage threshold, 

asymmetry) cause the relay of the device to be switched off and, 

as a result, the motor to be disconnected. 

Disconnection is carried out with a set delay in order to avoid 

accidental shutdowns in case of temporary interferences  in the 

power supply network. 

If the voltage drops below 320 V or rises above 480 V, the discon-

nection is carried out after 1 sec. The countdown to shutdown is 

indicated by the green diode flashing.

The relay is switched on again automatically when the correct 

network parameters return (voltage hysteresis is approx. 5 V).

If the phase sequence is changed before the sensor causing an 

unwanted change of the motor rotation direction, the sensor 

will not allow the motor to start (the red LED is on and the relay 

is off). Re-activation is possible after the correct phase sequence 

has been restored.

Functioning