354 Rockwell Automation Publication 750-PM001N-EN-P - February 2017
Chapter 6 Troubleshooting
Drive does not Start from HIM.
Drive does not respond to changes in speed command.
Motor and/or drive does not accelerate to commanded speed.
Motor operation is unstable.
Cause(s) Indication Corrective Action
Drive is configured for 2 wire level
control.
None Change P150 [Digital In Conf] to correct control
function.
Another device has Manual control. None
Port does not have control. None Change P324 [Logic Mask] to enable correct port.
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 P2 [Commanded SpdRef] for correct source.
(See page 48)
Incorrect reference source has been
programmed.
None 3. Check P545 [Spd Ref A Sel] for the source of the
speed reference. (See page 110)
4. Reprogram P545 [Spd Ref A Sel] for correct source.
(See page 110)
Incorrect Reference source is being
selected via remote device or digital
inputs.
None 5. Check P935 [Drive Status 1], page 154, bits 12 and
13 for unexpected source selections.
6. Check P220 [Digital In Sts], page 72 to see if inputs
are selecting an alternate source.
7. Check configuration of P173…175 [DI Speed Sel
n] functions
Cause(s) Indication Corrective Action
Acceleration time is excessive. None Reprogram P535/536 [Accel Time X]. (See page 109)
Excess load or short acceleration times
force the drive into current limit,
slowing or stopping acceleration.
None Check P935 [Drive Status 1], bit 27 to see if the drive is
in Current Limit. (See page 154)
Remove excess load or reprogram P535/536 [Accel
Time n].(See page 109)
Speed command source or value is not
as expected.
None Check for the proper Speed Command using Steps
1...7 in “Drive does not respond to changes in speed
command.”
Programming is preventing the drive
output from exceeding limiting values.
None Check P520 [Max Fwd Speed], P521 [Max Rev Speed]
(See page 108)
and P37 [Maximum Freq] (See
page 51) 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 Tune” or “Rotate Tune” Autotune
procedure. See P70 [Autotune] on page 57
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