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

Page 45

Troubleshooting

Line fuse blows.

Line fuse does not
blow, but the motor
does not run.

1. Line fuse is the
wrong size.

2. Motor cable or
armature is shorted to
ground.

3. Nuisance tripping
caused by a
combination of ambient
conditions and high-
current spikes (i.e.
reversing).

1. Speed adjust
potentiometer is set to
zero speed.

2. INHIBIT terminals
are jumpered.

3. S2 is shorted to S1.

4. Drive is in current
limit.

5. Drive is not receiving
AC line voltage.

6. Motor is not
connected.

1. Check that the line
fuse is correct for the
motor size.

2. Check motor cable
and armature for
shorts.

3. Add a blower to cool
the drive components;
decrease TORQUE
settings, or resize
motor and drive for
actual load demand, or
check for incorrectly
aligned mechanical
components or “jams”.

1. Increase the speed
adjust potentiometer
setting.

2. Remove jumper from
the INHIBIT terminals.

3. Remove short.

4. Verify that motor is
not jammed. Increase
TORQUE setting if they
are set too low.

5. Apply AC line voltage
to L1 and L2.

6. Connect motor to A1
and A2.

Problem

Possible
Causes