Technical information

7 – TROUBLESHOOTING
100
7.1.7 Other Situations
Condition Cause Solution
If input phasing correct, exchange
any two output wires.
Motor Rotates in Wrong Direction Phasing incorrect
If input phasing incorrect, exchange
any two input wires.
Erratic Operation Loose connections Shut off all power and check all
connections.
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 if necessary
motor OL settings.
Motor Overheats
Motor cooling obstructed/damaged Remove cooling air obstructions.
Check motor cooling fan.
Fan power supply lost Verify fan power supply, check fuses.
Fan wiring problem Check fan wiring.
Starter cooling fans do not operate
(When Present)
Fan failure Replace fan
Voltage/Current output jumper (JP1)
not set correctly.
Set jumper to give correct output.
Wiring problem Verify output wiring.
Analog Output Function parameter
(P50/ I/O12) set incorrectly.
Verify that the Analog Output
Function parameter is set correctly.
Analog Output Offset and/or Span
parameters (P51/ I/O13 and
P52/ 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 analog output
specifications.
Analog Output not functioning
properly
Ground loop or noise problems. Verify correct grounding of analog
output connection to prevent noise
and/or ground loops from affecting
output.
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 control card.
Display interface card (when present)
not firmly plugged in.
Verify that the display interface card
(if present) is firmly attached to MX
control card.
Remote Keypad does not operate
correctly.
Remote display damaged. Replace remote display.