10
T-154 0-240°C protection relays
TECSYSTEM S.r.l ®
TROUBLESHOOTING
PROBLEMS
CAUSES / SOLUTIONS
The unit will not switch on, with control
power energized
Check the terminal block for correct installa-
tion. Check for voltage at the terminal block
Channel 4 is indicating fault and display-
ing FOC (only three Pt100 sensors are
connected)
Wrong programming of the unit.
Repeat programming.
One of the 3/4 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.
Install a transient suppressor (PT-73.)
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 Ohme-
tre.
The unit is calibrated incorrectly.
Return for repair.
With a control power source of 24 VDC
the unit switches off and will not switch
back on.
Check the input voltage is between 20-24
VDC.
Reconnect to a stable source of power.
Return if unit does not respond
Sudden activation of the trip relay with
normal operating temperature.
One channel caused the occurrence.
Sensor defective (Fcd).
Replace the sensor.
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