Allen-Bradley PowerFlex 70 User Manual page 88

4-12 Troubleshooting
Motor operation is unstable.
Cause(s)
Motor data was incorrectly
entered or Autotune was not
performed.
Drive will not reverse motor direction.
Cause(s)
Digital input is not selected for
reversing control.
Digital input is incorrectly
wired.
Direction mode parameter is
incorrectly programmed.
Motor wiring is improperly
phased for reverse.
A bipolar analog speed
command input is incorrectly
wired or signal is absent.
Stopping the drive results in a Decel Inhibit fault.
Cause(s)
The bus regulation feature is
enabled and is halting
deceleration due to excessive
bus voltage. Excess bus
voltage is normally due to
excessive regenerated energy
or unstable AC line input
voltages.
Internal timer has halted drive
operation.
Indication
None
Indication
None
None
None
None
None
Indication
Decel Inhibit fault screen.
LCD Status Line indicates
"Faulted".
Corrective Action
1. Correctly enter motor nameplate
data.
2. Perform "Static" or "Rotate"
Autotune procedure.
(Param #061, page 3-11)
Corrective Action
Check [Digital Inx Sel]
page 3-35). Choose correct input
and program for reversing mode.
Check input wiring. (See page 1-13)
Reprogram [Direction Mode] for
analog "Bipolar" or digital "Unipolar"
control. (Param #190, page 3-21)
Switch two motor leads.
1. Use meter to check that an
analog input voltage is present.
2. Check wiring. (See page 1-14)
Positive voltage commands forward
direction.
Negative voltage commands reverse
direction.
Corrective Action
1. See Attention statement on
Preface-4.
2. Reprogram bus regulation
(parameters 161 and 162) to
eliminate any "Adjust Freq"
selection.
3. Disable bus regulation
(parameters 161 and 162) and
add a dynamic brake.
4. Correct AC input line instability
or add an isolation transformer.
5. Reset drive.
(See