41
MMRG Series
PROBLEM
POSSIBLE CAUSE
SUGGESTED SOLUTIONS
Motor does not
stop when the
speed adjust
potentiometer
is full CCW.
1. Noise on logic wires.
1. Place a .01 μF capacitor across
terminals S0 and S2.
Motor runs in
the opposite
direction
1. Motor connections to A1
and A2 are reversed.
1. Remove power. Reverse
connections to A1 and A2.
Reapply power.
Motor runs too
fast.
1. MAX SPD is set too high.
1. Calibrate MAX SPD.
Motor will
not reach the
desired speed.
1. MAX SPD setting is too low.
1. Increase MAX SPD setting.
2. IR COMP setting is too low.
2. Increase IR COMP setting.
3. FORWARD TORQUE /
REVERSE TORQUE setting is
too low.
3. Increase FORWARD TORQUE /
REVERSE TORQUE setting.
4. Motor is overloaded.
4. Check motor load. Resize the
motor and drive if necessary.
Motor pulsates
or surges under
load.
1. IR COMP is set too high.
1. Adjust the IR COMP setting
slightly CCW until the motor
speed stabilizes.
2. Motor bouncing in and out
of current limit.
2. Make sure motor is not
undersized for load; adjust
FORWARD TORQUE / REVERSE
TORQUE trim pot CW.
