BENSHAW RediStart EXEXMVRMX3 Series, User Manual

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8 - TROUBLESHOOTING & MAINTENANCE
Fault Code Description Detailed Description of Fault / Possible Solutions
F47
Stack Protection Fault (stack
thermal overload)
The MX
3
electronic power stack OL protection has detected an overload
condition.
Check motor for jammed or overloaded condition.
Verify that the CT ratio (FUN 03) is correct.
Motor load exceeds power stack rating. Consult factory
F48 Bypass /2M Contactor Fault
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 25).
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 (I/O 10 - I/O 15).
Verify that the bypass/2M contactor power supply is present (J4).
Verify that the appropriate Digital Input Configuration parameter (I/O 01 -08) has
been programmed correctly.
Verify that the bypass contactor(s) are not damaged or faulty.
F49 Inline Contactor Fault
The in-line contactor did not close.
Check wiring to coil of contactor.
Check feedback wiring from auxiliary contactor to digital input (I/O 01 - 08).
Check in-line fault delay (I/O 24).
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.
F51 Current Sensor Offset Error
Indicates that the MX
3
control card self-diagnostics have detected a problem with
one or more of the current sensor inputs.
Verify that the motor FLA (QST 01) and CT ratio (FUN 03) are correct.
Verify that no actual current is flowing through any of the starter’s CTs when the
starter is not running.
Consult factory if fault persists.
F53 Tachometer Signal Loss
No tachometer signal detected during start or run.
Verify tachometer wiring and level of signal.
Verify tachometer Full Speed Voltage (FUN 13) setting.
Extend Tachometer Loss Time (FUN 14) to allow time for motor to start turning.
Increase Initial Current to make sure motor starts turning immediately after the
start command is given.
F54 BIST Fault
The Build In Self Test was cancelled.
The disconnect (if present) was closed during standard BIST testing.
Line voltage and/or phase current was detected during standard BIST testing.
During powered BIST testing the disconnect was opened during testing.
During powered BIST testing line voltage was lost during testing.
F55 BIST CT Fault
During powered BIST testing the starter detected that one or more CTs are located
on the incorrect phases or one or more CT's polarities are reversed.
Verify CT wiring, positioning and direction.
F56 RTD Open or Shorted
An open or shorted RTD was detected.
Verify the condition and wiring of the RTD.