8.3.7 Other Situations
179
8 - TROUBLESHOOTING & MAINTENANCE
Condition Cause Solution
Motor Rotates in Wrong Direction. Phasing incorrect. If input phasing correct, exchange any
two output wires.
If input phasing incorrect, exchange any
two input wires.
Erratic Operation. Loose connections. Shut off all power and check all
connections.
Motor Overheats. Motor overloaded. Reduce motor load.
Too many starts per hour. Allow for adequate motor cooling
between starts. Set Hot/Cold ratio higher
or lengthen cooling time.
High ambient temperature. Reduce ambient temperature or provide
for better cooling. Set OL class lower to
compensate for ambient temperature.
Acceleration time too long. Reduce starting load and/or review
acceleration ramp settings.
Incorrect motor OL settings. Review and correct motor OL settings.
Motor cooling obstructed/damaged. Remove cooling air obstructions. Check
motor cooling fan.
Starter cooling fans do not operate.
(When Present)
Fan power supply lost. Verify fan power supply, check fuses.
Fan wiring problem. Check fan wiring.
Fan failure. Replace fan.
Analog Output not functioning properly. Voltage/Current output switch(SWI-2)
not set correctly.
Set switch SW1 to give correct output.
Wiring problem. Verify output wiring.
Analog Output Function parameter (P60/
I/O12) set incorrectly.
Verify that the Analog Output Function
parameter is set correctly.
Analog Output Offset and/or Span
parameters (P61/ I/O13 and P62/ I/O14)
set incorrectly.
Verify that the Analog Output Span and
Offset parameters are set correctly.
Load on analog output too high. Verify that load on analog output meets
the MX
2
analog output specifications.
Ground loop or noise problems. Verify correct grounding of analog output
connection to prevent noise and/or ground
loops from affecting output.
Remote Keypad does not operate
correctly.
Keypad cable not plugged in properly or
cable is damaged.
Verify that the remote keypad cable has
not been damaged and that it is properly
seated at both the keypad and the MX
2
control card.
Remote display damaged. Replace remote display.
Cannot change parameters. Passcode is set. Clear passcode.
Starter is running. Stop starter.
Modbus is overriding. Stop communications.
Heater Level (P73 / FUN08) parameter is
"On"
Turn Heater Level (P73 / FUN08)
parameter "Off"
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