Fuses (NEMA & CE enclosures):
Remove main fuses and transformer fuses.
Check with an ohmmeter or continuity light. If
one fuse is replaced, all others of that type
fuse should also be replaced.
Heaters (NEMA enclosure): If heaters
(thermal overloads) have been tripped sever-
al times they may fail to reset. If one heater
fails, all heaters in that starter should be
replaced. Check for proper motor current
draw if heaters continue to trip.
Starter coil (NEMA enclosure):
Disconnect leads from coil at front of motor
starter and check with an ohmmeter. Replace
if necessary.
Contactor (CE enclosure): Disconnect
leads from coil on top of contactor and check
with an ohmmeter. Replace coil or contactor
if necessary.
Overload relay (NEMA & CE enclo-
sures): If overload relay has been tripped
several times, it may fail to reset and must be
replaced. Check for proper motor current
draw if overload relay continues to trip.
Safety switches: Terminals should be
tight and free from corrosion. Recommended
torque is 5 inch pounds or 0.56 newton-
meters. Check sensors, actuators and cords
for damage. Switches should be replaced
if any defect or damage is detected. Check
switch alignment. Actuator must be
aligned and within 1/16" (1.6 mm) of
sensor to complete safety switch circuit
(Figure 24).
(“Electrical Assembly”, con’t. on page 42)
MAINTENANCE
Electrical Assembly
41
Figure 24 — Safety switch sensors and actuators
must be aligned and within 1/16" (1.6 mm).
(1) Sensor, (2) Actuator
1
2
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