20
TEMPERATURE MONITORING DEVICE COMEM DTI AND COMEM EDTI
- INSTRUCTION MANUAL
—
8. Diagnostic
The device is provided of the thermic probes diagnostic function.
The condition controlled on the measured input are:
• Probe PT100 interrupted: signalling on the display the message
O P E (open).
• Probe in short circuit: signalling on the display the message S H
R (short circuit).
• Probe out of order for wrong read temperature: signalling on
the display the message F D C.
When the device switches on the auto-diagnostic, FAULT relay
commutes and it remains in the energized status until one of the
above-described conditions appears, or if a device failure occurs,
or if the power supply is absent.
The anomaly conditions are signalled also by the FAULT led on.
Every time that a probe is out of order because it is interrupted
(OPE) or in short circuit (SHR) or the delta of temperature is too
elevated (FDC), the corresponding channel LED flashes until the
anomaly stop.
The alarm of interrupted probe (SHR) or open probe (OPE) will be
reset automatically while the alarm for the delta of temperature
(FDC) disappears by pressing this sequence:
• push the ENTER key
• keep it pressed
• press the ⇒+ key at least for 5 seconds.
The status of the relay contact (all available with exchange
contact) is showed in the following table:
RELAY
DISABLE STATUS
ENABLE STATUS
UNPOWERED STATUS
ALARM
OFF: closed 29-30
ON: closed 29-31
closed 29-30
TRIP
OFF: closed 32-33
ON: closed 32-33
closed 32-33
FAN
OFF: closed 35-36
ON: closed 35-37
closed 35-36
FAULT
OFF: closed 38-40
ON: closed 38-39
closed 38-39
