Troubleshooting 25
Problem
Possible Cause
Corrective Action
1. Motor does not run;
Power On, Indicator
not lit.
1. Power switch is in Off
position, or
2. AC voltage is not
brought to L1 and L2
terminals.
3. Blown line fuse
1. Toggle power switch
to On position; or
2. Correct wiring to
control box.
3. Replace line fuse with
20A rated 3AB-type
fuse. If fuse blew due
to mis-wiring, speed
control module may
be damaged.
2. Motor does not run;
power On indicator lit.
1. Directional Selection
Switch set to BRK.
2. Speed control knob
set to 0 (zero).
3. Defective motor.
4. Plug-in Horsepower
Resistor
®
not
installed.
5. Blown armature fuse.
1. Set Directional
Selection Switch to
FWD or REV.
2. Turn knob clockwise
to start motor.
3. Check for defective
motor, worn brushes,
etc. Replace motor
4. Install proper plug-in
Horsepower
Resistor
®
.
5. Replace fuse with
fuse of proper value.
3. Motor hums or runs at
very low speed (with
speed control knob
turned up to a high
speed setting) or
motor slows down
substantially when
load is applied.
1. Low voltage.
2. Overload condition:
control in current limit
mode (CL trim pot not
set correctly). (CL
LED is lit.)
3. Plug-in Horsepower
Resistor
®
is not the
correct size/rating.
4. Incorrect wiring.
Armature and shunt
connections
interchanged (shunt
motor only.
1. Check line voltage at
control and rewire as
required.
2. Reduce loading; CL
trim pot setting may
need to be increased.
See Adjustments
section.
3. Install correct plug-in
Horsepower Resistor
®
rated for motor power.
4. Correct wiring
(armature has lower
resistance than field).
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