Publication 20A-IN009C-EN-P
46 PowerFlex® 70 Adjustable Frequency AC Drive Installation Instructions
Drive does not respond to changes in speed command.
Motor and/or drive will not accelerate to commanded speed.
Motor operation is unstable.
Cause(s) Indication Corrective Action
No value is coming from the source
of the command.
LCD HIM
Status Line
indicates “At
Speed” and
output is 0 Hz.
1. If the source is an analog input, check wiring
and use a meter to check for presence of
signal.
2. Check [Commanded Freq] for correct
source.
Incorrect reference source has
been programmed.
None 3. Check [Speed Ref Source] for the source of
the speed reference.
4. Reprogram [Speed Ref A Sel] for correct
source.
Incorrect Reference source is being
selected via remote device or digital
inputs.
None 5. Check [Drive Status 1], bits 12 and 13 for
unexpected source selections.
6. Check [Dig In Status] to see if inputs are
selecting an alternate source.
7. Reprogram digital inputs to correct “Speed
Sel x” option.
Cause(s) Indication Corrective Action
Acceleration time is excessive. None Reprogram [Accel Time x].
Excess load or short acceleration
times force the drive into current
limit, slowing or stopping
acceleration.
None Check [Drive Status 2], bit 10 to see if the drive
is in Current Limit.
Remove excess load or reprogram [Accel Time
x].
Speed command source or value is
not as expected.
None Check for the proper Speed Command using
Steps 1 through 7 above.
Programming is preventing the
drive output from exceeding limiting
values.
None Check [Maximum Speed] and [Maximum Freq]
to assure that speed is not limited by
programming.
Cause(s) Indication Corrective Action
Motor data was incorrectly entered
or Autotune was not performed.
None 1. Correctly enter motor nameplate data.
2. Perform “Static” or “Rotate” Autotune
procedure.
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