Troubleshooting 4-7
Drive does not respond to changes in speed command.
Motor and/or drive will not accelerate to commanded speed.
Cause(s) Indication Corrective Action
No value is coming from the
source of the command.
The drive “Run” indicator is lit
and output is 0 Hz.
• Check d301
[Control Source] for
correct source.
• If the source is an analog input,
check wiring and use a meter to
check for presence of signal.
• Check b002
[Commanded Freq]
to verify correct command.
Incorrect reference source is
being selected via remote
device or digital inputs.
None • Check d301
[Control Source] for
correct source.
• Check d302
[Contrl In Status] to
see if inputs are selecting an
alternate source. Verify settings
for T051
- T054 [Digital Inx Sel].
• Check P038
[Speed Reference]
for the source of the speed
reference. Reprogram as
necessary.
• Review the Speed Reference
Control chart on page 1-24
.
Cause(s) Indication Corrective Action
Acceleration time is excessive. None Reprogram P039
[Accel Time 1] or
A147
[Accel Time 2].
Excess load or short
acceleration times force the
drive into current limit, slowing
or stopping acceleration.
None Compare b003
[Output Current] with
A179
[Current Limit 1].
Remove excess load or reprogram
P039
[Accel Time 1] or A147 [Accel
Time 2].
Check for improper A170
[Boost
Select] setting.
Speed command source or
value is not as expected.
None Verify b002
[Commanded Freq].
Check d301
[Control Source] for the
proper Speed Command.
Programming is preventing the
drive output from exceeding
limiting values.
None Check P035
[Maximum Freq] to
insure that speed is not limited by
programming.
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