Rockwell Automation Publication 750-PM101B-EN-P - April 2022 103
Chapter 4 Troubleshooting
Incorrect digital input programming.
• Mutually exclusive choices have been made
(for example, Jog and Jog Forward)
• 2-wire and 3-wire programming may be
conflicting
• Start configured without a Stop configured
None Configure input function.
Flashing yellow status
light and ‘DigIn Cnfg B’
or
‘DigIn Cnfg C’ indication on
LCD HIM.
10:355 [Motor Side Sts 2]
shows type 2 alarm(s).
Resolve input function conflicts.
Terminal block does not have control. None Check 0:41 [Logic Mask].
Drive does not Start from HIM.
Cause(s) Indication Corrective Action
Drive is configured for 2-wire level control. None
Change 0:101 [Digital In Cfg] to correct
control function.
Another device has Manual control. None —
Port does not have control. None
Change 0:41 [Logic Mask] to enable
correct port.
Drive does not respond to changes in speed command.
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.
• If the source is an analog input,
check wiring and use a meter to
check for presence of signal
Incorrect reference source has been
programmed.
None
• Check 10:1800 [VRef A Sel] for the
source of the speed reference
• Reprogram 10:1800 [VRef A Sel] for
correct source
Incorrect Reference source is being selected
via remote device or digital inputs.
None
• Check 10:354 [Motor Side Sts 1], bits
12 and 13 for unexpected source
selections
• Check 0:100 [Digital In Sts], to see if
inputs are selecting an alternate
source
• Check configuration of
173…175 [DI Speed Sel n] functions
Motor and/or drive will not accelerate to commanded speed.
Cause(s) Indication Corrective Action
Acceleration time is excessive. None
Reprogram 10:1915/
1916 [VRef Accel Timen].
Excess load or short acceleration times force
the drive into current limit, slowing or
stopping acceleration.
None
Check 10:354 [Motor Side Sts 1], bit 27
to see if the drive is in Current Limit.
Remove excess load or reprogram
10:1915/1916 [VRef Accel Timen].
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 10:1898 [Vel Limit Pos],
10:1899 [Vel Limit Neg], and
10:422 [Maximum Freq] to assure that
speed is not limited by programming.
Motor operation is unstable.
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 parameter
10:910 [Autotune].
Drive does not start from Start or Run inputs that are wired to the terminal block.
Cause(s) Indication Corrective Action
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