MEASUREMENT SIGNAL TRANSFER
All the cables transferring the Pt100 measurement signals (Ni100 or Ni120 option) must:
be separated from the power cables
be shielded cables with twisted conductors
have at least 0.5 mm² section
be twisted with a 60mm pitch maximum
be firmly fixed inside the terminal boxes
have tinned or silvered conductors
NOTE: to install the sensors and signal transferring cable correctly, read the sensor and SCS installation note manual.
1MN0035 REV. 0
All T series control units have linearity of the sensor signal, with a maximum error of 1% of full scale value.
TEMPERATURE SENSOR DIAGNOSTICS
In case of failure or exceeded full scale value of one of the thermometric sensors installed on the machine to be
protected, the FAULT relay switches immediately with the relative warning of faulty sensor on the corresponding channel.
Fcc highlights that the sensor is short-circuited or that the minimum full scale value of the unit -10°C (14°F) has
been exceeded.
Foc highlights that the sensor is open or that the maximum full scale value of the unit 230°C (473°F) has been
exceeded.
To eliminate the message and reset FAULT switching, it is necessary to check the Pt100 (Ni100 or Ni120 optional)
connections and replace the faulty sensor (if any). If the minimum/maximum full scale value has been reached, check that
the ambient conditions match the control unit reading.
Note: exceeding the minimum/maximum full scale value can be caused by interference on the sensor lines; in this case we
recommend that you check:
the correct installation of the sensors and above all of the extension cable (as stated in the paragraph MEASUREMENT
SIGNAL TRANSFER) the activation of the FCD function of the control unit (as stated in the FCD FUNCTION NOTES on
page 18).
CAL message display: it appears when a damage is found in the measurement circuit. The temperature values displayed
might be incorrect. Return the control unit to TECSYSTEM for repair.
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