CM-2201/CM-2202
Troubleshooting
©2018 Nelson Heat Tracing Systems
www.nelsonheaters.com
GA2497 Rev.6
19
9.4.9
High RTD A/ RTD B Temperature Reading
This warning/alarm appear when the temperature exceeds the
HIGH RTD WARNING/ALARM temperature setting.
Cause of Warning/Alarm:
•
Warning/Alarm temperature setting too close to maintain
temperature
•
Flow of hot product
•
Steaming out lines
•
Incorrect tracer wiring
9.4.10
Low RTD A/ RTD B Temperature Reading
This warning/alarm appears when the temperature
decreases below the LOW RTD WARNING/ALARM temperature
setting.
Cause of Warning/Alarm:
•
Warning/Alarm temperature setting too close to maintain
temperature
•
Flow of cold product
•
Empty pipe
•
Damaged, wet, or missing insulation
•
Heating cable not sized properly for the application
9.4.11
RTD A/ RTD B 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
9.4.12
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
.
9.4.13
High Voltage Warning/Alarm
This warning/alarms voltage levels that are greater than the
HIGH VOLTAGE WARNING/ALARM setting.
Cause of Warning/Alarm:
•
Warning/Alarm setting too close to normal operating voltage
•
Incorrect wiring
•
Power surge
9.4.14
Low Voltage Warning/Alarm
This warning/alarms voltage levels are less than the LOW
VOLTAGE WARNING/ALARM setting.
Cause of Warning/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
