nvent 910 Series Installation, Operating And Maintenance Instructions page 57

• Heating cable not sized properly for the application
8.3.3 TS 1/ TS 2 FAILURE
This alarm indicates a sensor is not operating properly. The temperature sensor may fail due to
an "open" or "shorted" condition.
Cause of Alarm:
• Incorrect or damaged field wiring—open leads or excess resistance (either intermittent or
continuous) may be due to broken or damaged wires or loose terminals.
• Damaged or inoperative temperature sensors
8.3.4 CONTROL TS FAILURE
This alarms a failure of the temperature sensing element designated as the control element
by the TS CONTROL MODE setting. Depending on the chosen TS FAIL MODE and TS CONTROL
MODE, the output switch may be latched off or on until this failure is corrected.
Cause of Alarm:
• Incorrect or damaged field wiring—open leads or excess resistance (either intermittent or
continuous) may be due to broken or damaged wires or loose terminals.
• Damaged or inoperative temperature sensors
8.3.5 HIGH CURRENT
This alarms current levels that are greater than the HIGH CURRENT ALARM setting for the
application.
Cause of Alarm:
• Alarm setting too close to normal operating current
• High in-rush current from "cold start" of self regulating cable
• Damaged or partially shorted heating cable
• "As built" cable length is greater than design value
8.3.6 LOW CURRENT
This alarms current levels which are less than the LOW CURRENT ALARM setting.
Cause of Alarm:
• Alarm setting too close to normal operating current
• Low source voltage
• Damaged or inoperative heating cable
• Open connection—wiring problem
• SSR or contactor failed open
8.3.7 HIGH GFI
This alarms ground fault current levels which are greater than the HIGH GFI ALARM setting.
Cause of Alarm:
• Alarm setting too close to normal leakage current
• Damaged cable insulation and/or moisture present
• Moisture in junction box
• Poor splice or termination
• Moisture provides conductive ground path which allows ground fault current
8.3.8 GFI TRIP
This value sets the upper limit of allowable ground fault leakage. Exceeding this limit will result in
the output switch being latched off and the alarm activated to indicate a ground fault condition.
Cause of Alarm:
• Trip setting too close to normal leakage current
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