10
T538 protection relays
TECSYSTEM S.r.l ®
FAULTS DIAGNOSTIC CAUSES AND REMEDIES
The unit doesn’t switch on even if there is volt-
age to the terminals
Connector not well fit in its place.
Connection wires not well closed in the clamp Burnt
power supplier.
Take away and give again voltage.
The sensor is damaged The FAULT relay closes and the FAULT LED
switches on. The RED LED of the relative channel is
lightening. It is indicated on the display the kind of
damage of the sensors:
FOC= sensor open
FCC= sensor in short circuit
One of the eight channels is in FAULT for FOC/
FCC
Check the Pt100 sensors connection.
Probable damaged sensor.
Replace the damaged sensor
During the main switch manoeuvre ON-OFF, the
ALARM and TRIP relays energize
Strong electrical noises on the power supply line.
Plug in the PT73.
Check if the shield of the signal transport cable is
connected to the ground in the side of the panel.
If you have not any shielded cable, You have to put
it. (Mod. CT-ES).
If it is not at your disposal, twist the three connecting
wires of the sensors.
All the Pt100 sensors are in FCC. Wrong connection of the sensors. Upside-down ter-
minal board.
Check the connections and the terminal board
The temperature indicated by 1 or more chan-
nels is wrong.
Pt100 Sensor/s defective.
Check the sensor resistance by an Ohm meter.
Unit with input circuit unrated.
Send the unit to TECSYSTEM S.r.l. for reparation.
With power supply at 24 Vdc, the unit switches
off and , after a tension drop, it doesn’t switch on
again.
Take off the voltage to the unit and check that the
value of the Vdc is from 20 up to 24V.
Give again voltage.
If the unit does not switch on , send the unit back to
TECSYSTEM S.r.l.
Sudden release of the main switch with a normal
temperature level.
An only channel caused the unhooking.
Pt100 sensor defective (Fcd).
Replace the sensor.Check the measure signal ter-
minal board.
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