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6.3 Common Alarms—What to look for
Alarm Description Cause of Alarm
High TS 1/TS 2 Temperature Appears when the temperature exceeds the HIGH TS
ALARM
• Alarm temperature setting too close to maintain
temperature
• Flow of hot product
• Steaming out lines
• Incorrect tracer wiring
• Incorrect RTD TYPE selected
Low TS 1/TS 2 Temperature Appears when the temperature decreases below the
LOW TS ALARM temperature.
• 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
• Heating cable damaged
• Incorrect RTD TYPE selected
TS 1/TS 2 Failure Indicates that a sensor is operating improperly. • 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
Control TS Failure Alarms a failure of the temperature-sensing element des-
ignated 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.
• 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
High Current Alarms current levels that are greater than the HIGH
CURRENT ALARM setting for the application.
• Alarm setting too close to normal operating
• 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
• Incorrect CURRENT TURNS RATIO setting
Low Current Alarms current levels that are less than the LOW CUR-
RENT ALARM setting
• 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
• Incorrect CURRENT TURNS RATIO setting
High GFI Alarms ground-fault current levels that are greater than
the HIGH GFI ALARM setting
• 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 that allows
ground-fault current
GFI Trip This value sets the upper limit of allowable ground-fault
leakage. Exceeding this link results in the output switch
being latched off and the alarm activated to indicate a
ground-fault condition.
• Trip setting too normal leakage current
• Damaged cable insulation and/or moisture present
• Moisture in junction box
• Poor splice or termination
• Moisture provides conductive ground path that allows
ground-fault current
High Voltage Alarms voltage levels that are greater than the HIGH
VOLTAGE ALARM setting
• Alarm setting too close to normal operating voltage
• Incorrect wiring
• Incorrect VOLTAGE TURNS RATIO
•Power surge
Low Voltage
This alarms voltage levels which are less than the
LOW VOLTAGE ALARM setting.
• Alarm setting too close to normal operating voltage
• Damaged power cable
• Incorrect
VOLTAGE TURNS RATIO
• Brown-out conditions
• Loss of power to the circuit
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