McQuay WSC Operating Manual page 80

Fault
Code
F21
F22
F23
F24
F25
F26
F27
F28
F30
F31
F34
80
Description
Verify that input power is three phase. Correct wiring if necessary.
Low voltage below the Undervoltage Trip Level parameter setting (PFN
08, P31) was detected for longer than the Over/Under Voltage Trip delay
time (PFN 09, P32).
Low Line L1-L2
Verify that the actual input voltage level is correct.
Low Line L2-L3
Verify that the Rated Voltage parameter (FUN 05,
Low Line L3-L1
Check input supply for open fuses or open connections.
On medium voltage systems, verify wiring of the voltage measurement
circuit.
High voltage above the Over voltage Trip Level parameter setting (PFN
07, P30) was detected for longer than the Over/Under Voltage Trip delay
High Line L1-L2
time (PFN 09, P32).
High Line L2-L3
Verify that the actual input voltage level is correct.
High Line L3-L1
Verify that the Rated Voltage parameter (FUN 05,
Line power quality problems/ excessive line distortions.
The D3 control has detected the loss of one or more input or output
phases when the starter was running. Can also be caused by line power
dropouts.
Check input supply for open fuses.
Phase Loss
Check power supply wiring for open or intermittent connections.
Check motor wiring for open or intermittent connections.
On medium voltage systems, verify wiring of the voltage feedback
measurement circuit.
No input voltage was detected for longer than the Inline Configuration
time delay parameter setting (I/O 15, P53) when a start command was
given to the starter.
No Line
Check input supply for open disconnects, open fuses, open circuit
breakers, or disconnected wiring.
On medium voltage systems, verify wiring of the voltage feedback
measurement circuit.
During operation, the D3 controller detected a very high level of current in
one or more phases.
I.O.C.
Check motor wiring for short circuits or ground faults.
(Instantaneous
Overcurrent
Check motor for short circuits or ground faults.
Current)
Check if power factor or surge capacitors are installed on the motor side
of the starter.
Motor current exceeded the Over Current Trip Level setting (PFN 01,
P24) for longer than the Over Current Trip Delay Time setting (PFN 02,
Overcurrent
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
Undercurrent
04, P27).
Check system for cause of under current condition.
Detailed Description of Fault / Possible Solutions
P66
) is set correctly.
P66
) is set correctly.
OM Centrif Micro ΙΙ-5