Common Alarms-What To Look For (Continued) - Pentair 920 Series Installation, Operating And Maintenance Instructions

6.3 Common aLarms—What to LooK for (ContInued)
alarm
High Voltage
Low Voltage
Overcurrent Trip
Switch Failure
HTC Reset
Power Limiting
C B Limiting
Switch Limiting
High Resistance
Low Resistance
INDUSTRIAL HEAT TRACING SOLUTIONS
description
Alarms voltage levels that are greater than
the HIGH VOLTAGE ALARM setting
This alarms voltage levels which are less
than the LOW VOLTAGE ALARM setting.
If the controller is unable to start the cable
due to high current or after attempting to
soft start it, the controller trips off its output
switch.
This alarm will indicate that the controller
senses current flow when the output switch
should be off.
This alarm is latched when power is restored
after an interruption. Used to identify
intermittent power losses.
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.
This alarm indicates that the controller is
limiting the average current to the CIRCUIT
BREAKER CURRENT RATING setting.
This alarm indicates that the controller is
limiting the average current that is applied
to the trace circuit based on the SWITCH
RATING setting to protect the solid-state
relay from excess current.
This alarm indicates that the heating cable
resistance has deviated from the NOMINAL
RESISTANCE setting by more than the HIGH
RESISTANCE ALARM setting.
This alarm indicates that the heating cable
resistance has deviated from the NOMINAL
RESISTANCE setting by more than the LOW
RESISTANCE ALARM setting.
EN- Raychem920series-IM-H56874 05/15
Cause of alarm
• Alarm setting too close to normal operating voltage
• Incorrect wiring
• Incorrect VOLTAGE TURNS RATIO
• Power surge
• Alarm setting too close to normal operating voltage
• Damaged power cable
• Incorrect VOLTAGE TURNS RATIO
• Brown-out conditions
• Loss of power to the circuit
• Excessive in-rush current
• Incorrect wiring
• Damaged cable
• Switch rating set too low
• Incorrect CURRENT TURNS RATIO setting
• Some other device has energized the heat trace cable
• Output switch has failed
• Circuit breaker tripped
• Power line transient
• Power applied to trace circuit is being limited to the
MAXIMUM POWER setting
• Incorrect VOLTAGE and/or CURRENT TURNS RATIO
setting
• Excessive current caused by in-rush current
• C.B. CURRENT RATING setting too low for normal
heater current draw or not matched to actual circuit
breaker size
• Incorrect CURRENT TURNS RATIO setting
• Excessive current caused by in-rush current
• Incorrect CURRENT TURNS RATIO setting
• Alarm setting too close to actual operating resistance
• NOMINAL RESISTANCE not set properly
• Open connection—wiring problem
• Damaged cable
• Incorrect VOLTAGE and/or CURRENT TURNS RATIO
setting
• Alarm setting too close to actual operating resistance
• NOMINAL RESISTANCE not set properly
• Partial short—wiring problem
• Damaged cable
• Incorrect VOLTAGE and/or CURRENT TURNS RATIO
setting
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