184
8 - TROUBLESHOOTING & MAINTENANCE
Fault Code Description Detailed Description of Fault / Possible Solutions
F40 Shorted / Open SCR 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 MX
2
control card.
Check all SCRs with ohmmeter for shorts.
Verify that the Input Phase Sensitivity parameter setting
(P77/FUN04) is correct.
Verify that the Starter Type parameter setting (P74/FUN07) is
correct.
Verify the motor wiring. (Verify dual voltage motors for correct
wiring configuration).
F41 Current at Stop 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 (P1/QST01) and CT ratio (P78/FUN03)
settings are correct.
F46 Disconnect Fault A signal on the disconnect digital input was not present when a start
was commanded.
Verify that disconnect feedback wiring is correct.
Verify that the disconnect is not faulty.
F47 Stack Protection Fault (stack thermal
overload)
The MX
2
electronic power stack OL protection has detected an
overload condition.
Check motor for jammed or overloaded condition.
Verify that the CT ratio (P78/FUN03) and burden switch settings
are correct.
Motor load exceeds power stack rating. Consult factory
F48 Bypass /2M Contactor Fault An incorrect bypass feedback has been detected for longer than the
Bypass Confirm time parameter setting (P64/ I/O17).
Verify that the bypass/2M contactor coil and feedback wiring is
correct.
Verify that the relay connected to the bypass/2M contactor(s) is
programmed as 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 not damaged or faulty.
F49 Inline Contactor Fault Verify that the appropriate Digital Input Configuration parameter
has been programmed correctly.
Verify that the inline contactor(s) are actually not damaged or
faulty.
F50 Control Power Low Low control power (below 90V) has been detected while running.
Verify that the control power input level is correct, especially
during starting when there may be significant line voltage drop.
Check control power transformer tap setting (if available).
Check control power transformer fuses (if present).
Check wiring between control power source and starter.
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