9
T2612 UNI
TECSYSTEM S.r.l ®
TROUBLESHOOTING
PROBLEMS
CAUSES /
SOLUTIONS
The unit will not switch on,
with control power energized.
Check the terminal block for correct instal-
lation.
Check for voltage at the terminal block.
Channel 4 is indicating fault and displaying
FOC
.
Only three Pt100 sensors are connected.
Wrong programming of the unit.
Repeat programming.
One of the 4 channels is indicating fault
and displaying
FOC/FCC
Check the sensors connection.
Look for damaged sensors.
Replace damaged sensor.
When switching the unit on-off, the alarm
and trip relays energize.
Strong electrical noise is being picked up
on the power line.
Check to ensure the shield of the sensor
cable is connected to the panel ground.
Install shielded cable (Mod. CT-ES) or
twist the sensor conductors.
All the sensors are displaying
FCC
.
Wrong wiring connections.
The terminal block is upside-down.
The temperature indicated by one or more
channels is wrong.
The sensors are defective.
Check the sensor resistance with an Ohm-
meter.
The unit is calibrated incorrectly.
Return for repair.
Sudden activation of the trip relay with
normal operating temperature.
One channel caused the occurrence.
Sensor defective (
Fcd
).
Replace the sensor.
