Rockwell Automation DC3N DC Drive User Guide, 1/4-2HP-115/230 VAC - Manual (Page 46)

38 Troubleshooting
Motor does not stop
when the speed adjust
potentiometer is full
CCW.
Motor runs in the
opposite direction (non-
reversing drives).
Motor runs too fast.
Motor will not reach the
desired speed.
Motor pulsates or
surges under load.
MIN SPD setting is too
high.
Motor connections to
A1 and A2 are
reversed.
1. MAX SPD and MIN
SPD are set too high.
1. MAX SPD setting is
too low.
2. IR COMP setting is
too low.
3. TORQUE setting is
too low.
4. Motor is overloaded.
1. IR COMP is set too
high.
2. Motor bouncing in
and out of current limit.
Calibrate MIN SPD.
Reverse connections to
A1 and A2.
1. Calibrate MAX SPD
and MIN SPD.
1. Increase MAX SPD
setting.
2. Increase IR COMP
setting.
3. Increase TORQUE
setting.
4. Check motor load.
Resize the motor if
necessary.
1. Adjust the IR COMP
setting slightly CCW
until the motor speed
stabilizes.
2. Make sure motor is
not undersized for load;
adjust TORQUE trimpot
CW.
Problem Possible
Causes Suggested
Solutions