Raychem C910-485 - Low Temperature Alarm Troubleshooting; Control Sensor Failure Troubleshooting; Ground-Fault Alarm Troubleshooting; Low Current Troubleshooting

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Ground-fault
alarms
Incorrect installation,
wet system
components or
damaged cables.
Perform heating cable commissioning
tests outlined in the heat cable operation
manuals.
Incorrect neutral return
wiring
Check that the heating cable circuit
neutrals return to the controller and are
not connected directly to the distribution
panel.
Alarm setting too close
to normal leakage
current
Ground-fault level should be set at the
lowest level possible, but high enough to
allow normal operation of the cable.
WARNING: Fire Hazard. Ground-fault trip alarms must not be
ignored. To prevent the risk of fire, do not re
-energize heating
cables until the fault is identified and corrected.
Low current
Low or no source
voltage
Verify correct power distribution
Damaged or inoperative
heating cable
Repair or replace heating cable
Open connection—
wiring problem
Verify correct power distribution wiring
Contactor failed open
Replace or repair controller
Switch failure
Output switch has
failed “closed”
Replace or repair controller
Contactor count
Number of off-to-on
transitions of a
contactor has
exceeded the
CONTACTOR COUNT
ALARM
setting and the
contactor should be
replaced.
Inspect contactor and replace if
necessary.