McQuay RVSS14 Installation, Operation And Maintenance Manual page 44

Fault
Description
Code
No Current at
F39
Run (Cont'd)
Shorted / Open
F40
SCR
Current at
F41
Stop
Stack
Protection
F47 Fault (stack
thermal
overload)
Bypass /2M
F48 Contactor
Fault
Continued on next page.
44
Detailed Description of Fault / Possible Solutions
Check if load is still connected to starter
Check if motor may have been driven by the load (a regeneration condition)
Check Gate and Cathode connections to D3 for loose connections.
Check for inline contactor or disconnect.
A shorted or open SCR condition has been detected.
Verify that all SCR gate leads wires are properly connected at the SCR devices and the
D3 control board.
Check all SCRs with ohmmeter for shorts.
Verify that the Input Phase Sensitivity parameter setting (FUN 04, P67) is correct.
Verify that the Starter Type parameter setting (FUN 07, P64) is correct.
Verify the motor wiring. (Verify dual voltage motors for correct wiring configuration).
Motor current was detected while the starter was not running.
Examine starter for shorted SCRs.
Examine bypass contactor (if present) to verify that it is open when starter is stopped.
Verify that the motor FLA (QST 01, P1), CT ratio (FUN 03, P68), and burden switch
settings are correct.
The D3 electronic power stack OL protection has detected an overload condition.
Check motor for jammed or overloaded condition.
Verify Starter Model Number parameter setting (FUN 13, P70) is correct (if available).
Verify that the CT ratio (FUN 03, P68) and burden switch settings are correct.
Motor load exceeds power stack rating. Consult factory
A digital input has been programmed as a Bypass/2M Contactor Feedback input and an
incorrect bypass feedback has been detected for longer than the Bypass Confirm time
parameter setting (I/O 16, P54).
Verify that the bypass/2M contactor coil and feedback wiring is correct.
Verify that the relay output that is connected to the bypass/2M contactor(s) is
programmed to the UTS function.
Verify that the bypass/2M contactor power supply is present.
Verify that the appropriate Digital Input Configuration parameter has been programmed
correctly.
Verify that the bypass contactor(s) are actually not damaged or faulty.
IOMM Starter