McQuay RVSS14 Installation, Operation And Maintenance Manual page 43

Fault
Description
Code
I.O.C.
(Instantaneous
F30
Overcurrent
Current)
F31 Overcurrent
F34 Undercurrent
Current
F37
Imbalance
F38 Ground Fault
F39 No Current at
Run
IOMM Starter
Detailed Description of Fault / Possible Solutions
During operation, the D3 controller detected a very high level of current in one or more
phases.
Check motor wiring for short circuits or ground faults.
Check motor for short circuits or ground faults.
Check if power factor or surge capacitors are installed on the motor side of the starter.
Verify that the motor FLA (QST 01, P1), CT ratio (FUN 03, P68), and burden switch
settings are correct.
Motor current exceeded the Over Current Trip Level setting (PFN 01, P24) for longer
than the Over Current Trip Delay Time setting (PFN 02, P25).
Check motor for a jammed or an overload condition.
Motor current dropped under the Under Current Trip Level setting (PFN 03, P26) for
longer than the Under Current Trip Delay time setting (PFN 04, P27).
Check system for cause of under current condition.
A current imbalance larger than the Current Imbalance Trip Level parameter setting
(PFN 05, P28) was present for longer than ten (10) seconds.
Check motor wiring for cause of imbalance. (Verify dual voltage and 6 lead motors for
correct wiring configuration).
Check for large input voltage imbalances that can result in large current imbalances.
Check motor for internal problems.
Ground current above the Ground Fault Trip level setting (PFN 06, P29) has been
detected for longer than 3 seconds.
Check motor wiring for ground faults.
Check motor for ground faults.
Megger motor and cabling (disconnect from starter before testing).
Verify that the motor FLA (QST 01, P1), CT ratio (FUN 03, P68), and burden switch
settings are correct.
Verify that the CTs are installed with all the White dots towards the input line.
Motor current went below 10% of FLA while the starter was running.
Verify Motor Connections.
Verify the CT wiring to the D3 control board.
Verify that the motor FLA (QST 01, P1), CT ratio (FUN 03, P68), and burden switch
settings are correct.
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