Rockwell Automation Publication 750-PM001N-EN-P - February 2017 355
Troubleshooting Chapter 6
Drive does not reverse motor direction.
A drive stop results in a Decel Inhibit fault.
A datalink cannot be established.
Cause(s) Indication Corrective Action
Digital input is not selected for reversing
control.
None Check that the DI Reversing function is correctly
configured.
Digital input is incorrectly wired. None Check digital input wiring.
Direction mode parameter is incorrectly
programmed.
None Reprogram P308 [Direction Mode], page 81
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 bipolar analog signal wiring.
Positive voltage commands forward direction.
Negative voltage commands reverse direction.
Cause(s) Indication Corrective Action
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.
Decel Inhibit fault
screen.
LCD Status Line
indicates
“Faulted.”
1. To eliminate any “Adjust Freq” selection,
reprogram parameters 372/373 [Bus Reg Mode n].
2. Disable bus regulation (parameters 372/373 [Bus
Reg Mode n]) and add a dynamic brake.
3. Correct AC input line instability or add an isolation
transformer.
4. Access P409 [Dec Inhibit Actn] to select desired
fault action.
5. Reset drive.
Cause(s) Indication Corrective Action
Another device is communicating with
the processor.
None 1. Verify that DeviceLogix is not running (Port 14, P53
[DLX Operation] = 5 “Logic Disabled.”)
2. Verify that a PLC is not communication with the
drive. Disconnect communication cable or inhibit
communication in PLC software.
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