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Operating and service manual
523
FC phase loss
Warning
Description
FC Phase Loss Fault Warning
Cause
Indication of defective FC or missing phase
Trouble
shooting
(W36)
Possible causes:
•
One or more phases are not applied to the FC.
•
Unstable power supply (generator).
•
Defect FC.
Accompanied alarms:
•
AL 417, AL 418, AL 419, AL 516 may be active.
Trouble shooting:
1. Verify that all 3 phases are present and voltage is correct.
2. Verify that voltage levels are the same for all 3 phases (diffence in voltage
below 14V AC).
3.
Supply unit with correct power voltage according to specification.
4. Replace the FC.
If no FC replacement is available, the unit can be rewired for emergency
operation.
Criteria
More than 70 V diff. in min./max. for phases in power supply.
Controller
action
None
Log
X
Alarm
X
Alarm light
Off
Consequence
If not solved, this problem can cause FC to stop due to alarm 516
Elimination
Warning will be marked as inactive in alarm list when reset by FC.
Alarm may then be deleted.
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive Freq FC
I FC
Psuc
Pdis