Rockwell Automation LPM20 Liquid-Cooled AC Drive with High Performance Drive Control User Manual
Page 59
Troubleshooting
3-5
Motor and/or drive will not accelerate to Commanded Speed.
Motor operation is unstable.
Drive will not reverse motor direction.
Cause(s)
Indication
Corrective Action
Acceleration time is excessive.
None
Reprogram [Accel Time x] parameter.
Excess load or short acceleration
times force the drive into current
limit, slowing or stopping
acceleration.
None
1. Check [Drive Status 2] parameter, bit 10 to
see if the drive is in Current Limit.
2. Remove excess load or reprogram [Accel
Time x] parameter.
Speed command source or value is
not as expected.
None
Check for the proper Speed Command using
Steps 1 through 7 previously described.
Programming is preventing the drive
output from exceeding limiting
values.
None
Check [Maximum Speed] parameter and
[Maximum Freq] parameter to assure that
speed is not limited by programming.
Cause(s)
Indication
Corrective Action
Motor data was incorrectly entered. None
Correctly enter motor nameplate data.
Cause(s)
Indication
Corrective Action
Digital input is not selected for
reversing control.
None
Check [Digital Inx Sel] parameter. Choose
correct input and program for reversing mode.
Digital input is incorrectly wired.
None
Check input wiring.
Direction mode parameter is
incorrectly programmed.
None
Reprogram [Direction Mode] parameter for
analog “Bipolar” or digital “Unipolar” control.
Motor wiring is improperly phased
for reverse.
None
Switch two motor leads.
A bipolar analog speed command
input is incorrectly wired or signal is
absent.
None
1. Use meter to check that an analog input
voltage is present.
2. Check wiring.
Positive voltage commands forward direction.
Negative voltage commands reverse direction.