Rockwell Automation DC3RD Digital Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 54)

46 Troubleshooting
Problem Possible
Causes
Suggested
Solutions
Motor runs too fast
at maximum speed
setting
Motor will not reach
the desired speed
Motor pulsates or
surges under load
1. MAX SPD setting
is too high.
2. Motor field
connections are
loose (shunt wound
motors only).
1. MAX SPD setting
is too low.
2. IR COMP setting
is too low.
3. Motor is
overloaded.
1. IR COMP is set
too high.
2. Motor “bouncing”
in and out of torque
limit.
1. Recalibrate MAX
SPD.
2. Check motor field
connections.
1. Increase MAX
SPD setting.
2. Increase the IR
COMP setting.
3. 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 FWD TQ
and REV TQ
trimpots.
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