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