McQuay WSC Operating Manual page 81

Fault
Code
F37
F38
F39
F40
F41
F47
F48
F50
F51
F52
F60
F61
F62
F71
OM Centrif Micro ΙΙ-5
Description
A current imbalance larger than the Current Imbalance Trip Level
parameter setting (PFN 05, P28) was present for longer than ten (10)
seconds.
Current
Check motor wiring for cause of imbalance. (Verify dual voltage and 6
Imbalance
lead motors for correct wiring configuration).
Check for large input voltage imbalances that can result in large current
imbalances.
Ground current above the Ground Fault Trip level setting (PFN 06, P29)
has been detected for longer than 3 seconds.
Ground Fault
F 38 Continued
Check motor wiring for ground faults.
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.
No Current at
Run
Check if load is still connected to starter
Shorted / Open
A shorted or open SCR condition has been detected.
SCR
Current at Stop Motor current was detected while the starter was not running.
Stack Protection
Fault (stack The D3 electronic power stack OL protection has detected an overload
thermal condition.
overload)
A digital input has been programmed as a Bypass/2M Contactor
Feedback input and an incorrect bypass feedback has been detected for
Bypass /2M
longer than the Bypass Confirm time parameter setting (I/O 16, P54).
Contactor Fault
Verify that the bypass contactor(s) are actually not damaged or faulty.
Low control power (below 90V) has been detected while running, by the
D3 controller.
Verify that the control power input level is correct especially during
starting when there may be significant line voltage drop.
Control Power
Low
Check control power transformer tap setting (if available).
Check control power transformer fuses (if present).
Check wiring between control power source and starter.
Indicates that the D3 control board self-diagnostics have detected a
Current Sensor
problem with one or more of the current sensor inputs.
Offset Error
Consult factory if fault persists.
Burden Switch The burden switch settings were changed when starter was running.
Error Only change burden switches when starter is not running.
External Fault on DI#1 has been programmed as a fault type digital input and the input
DI#1 Input indicates a fault condition is present.
External Fault on DI#2 has been programmed as a fault type digital input and input
DI#2 Input indicates a fault condition is present.
External Fault on DI#3 input has been programmed as a fault type digital input and input
DI#3 input indicates a fault condition is present.
Based on the Analog Input parameter settings, the analog input level has
Analog Input
either exceeded or dropped below the Analog Input Trip Level setting (I/O
Level Fault Trip.
P46
08,
Detailed Description of Fault / Possible Solutions
) for longer than the Analog Input Trip Delay time (I/O 09, P47).
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