LEESON Chassis Mount SCR Control - Manual (Page 57)

51 Troubleshooting SPEEDMASTER™ OPERATION MANUAL
Symptom Possible
Causes
Suggested
Solutions
Fuse blows or circuit
breaker trips
Line fuse does not
blow or circuit breaker
does not trip, but the
motor does not run
1. Line fuses or circuit
breakers are 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.
1. Reference signal or
speed adjust pot is set to
zero speed.
2. Reference signal or
speed adjust
potentiometer
connections are open.
1. Check that line fuses or
circuit breakers are the
proper 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”.
See page 39 for
information on
adjusting the TORQUE
trimpot.
1. Increase reference
signal or speed adjust
potentiometer setting.
2. Check that the
reference signal or
speed adjust
potentiometer
connections are not
open.