Technical information

7 – TROUBLESHOOTING
105
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.
F41 Current at Stop
Verify that the motor FLA (P1/QST01), CT ratio (P68/FUN03) and burden
switch settings are correct.
The MX electronic power stack OL protection has detected an overload
condition.
Check motor for jammed or overloaded condition.
Verify Starter Model Number parameter setting (P70/FUN13) is correct (if
available).
Verify that the CT ratio (P68/FUN03) and burden switch settings are
correct.
F47 Stack Protection Fault
(stack thermal overload)
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 (P54/ I/O16).
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.
F48 Bypass /2M 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
MX.
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).
F50 Control Power Low
Check wiring between control power source and starter.
Indicates that the MX control card self-diagnostics have detected a problem
with one or more of the current sensor inputs.
Verify that the motor FLA (P1/QST01), CT ratio (P68/FUN03) and burden
switch settings are correct.
Verify that no actual current is flowing through any of the starter’s CTs
when the starter is not running.
F51 Current Sensor Offset
Error
Consult factory if fault persists.
F52 Burden Switch Error The burden switch settings were changed when starter was running. Only
change burden switches when starter is not running.
DI#1 has been programmed as a fault type digital input and the input
indicates a fault condition is present.
Verify that the appropriate Digital Input Configuration parameter has been
programmed correctly.
F60 External Fault on DI#1
Input
Verify wiring and level of input.