CM-2201/CM-2202
Troubleshooting
©201
7
Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.
5
9.3.7
GFI Alarm (Continued)
Cause of Alarm:
• Trip 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
9.3.8
High Voltage Warning/Alarm
This warning/alarms voltage levels that are greater than the
HIGH VOLTAGE WARNING/ALARM setting.
CauseofWarning/Alarm:
• Warning/Alarm setting too close to normal operating voltage
• Incorrect wiring
• Powersurge
9.3.9
Low Voltage Warning/Alarm
This warning/alarms voltage levels are less than the LOW
VOLTAGE WARNING/ALARM setting.
CauseofWarning/Alarm:
• Warning/Alarm
setting
too
close
to
normal
operating
voltage
• Damaged power cable
• Incorrect VOLTAGE TURNS RATIO
• “Brown-out” conditions
• Loss of power to the circuit
9.3.10
Overcurrent Trip
If the controller is unable to start the cable due to high
current
or
after
attempting
to
soft
start
it, the
controller
will
trip its output switch off.
Cause of Alarm:
• Excessive in-rush current
• Incorrect CM-2201/CM2202 settings
• Incorrect wiring
• Damaged cable
Switch Failure
This alarm indicates that the controller senses current flow
when the output switch should
be off.
Cause of Alarm
• Some
other
device
energized
heat
trace
• Output switch has failed “closed”
9.3.11
Power Limiting (Current Limiting)
This alarm indicates that the solid state relay is limiting
the average amount of power that is applied to the trace
circuit as defined by the MAXIMUM POWER setting.
Cause of Alarm:
• Power applied to trace circuit is being limited to the
MAXIMUM POWER setting
9.3.12
EEPROM Data Failure
This alarm indicates that the controller has detected a
failure in its non-volatile memory (this is where all of the
controller’s
configuration
and calibration settings are
stored). This indicates an internal problem and the CM2201/
CM2202 should
be
replaced
and
returned
to
the
factory for
repair.
Cause of Alarm:
• The CM-2201/CM2202 cannot bypass the failed area of its
memory and has loaded factory defaults into this failed area.
2
3
9.3.13 Continuity Failure
The “Continuity Failure” alarm indicates that the current
being drawn by the load is less than about 0.5 Amps and
hence the load is assumed to be disconnected.
