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trouble shooting -- motor
NOTE:
Motors
used on wood-working
tools are particularly
susceptible
to the
accumulation
of sawdust and wood chips and should be blown out or "vacuumed"
frequently
to prevent
interference
with
normal
motor
ventilation
and proper
operation
of the centrifugally-operated
starting
switch
TROUBLE
Excessive noise_
Motor fails to develop
lull power° NOTE:
LOW VOLTAGE:
(Power
output of motor
decreases
rapidly with
decrease in voltage at
motor terminals
For
example,
a reduction
of
10% in voltage causes
a reduction
of 19% in
maximum
power output
of which the motor is
capable, and a reduction
of 20% in voltage causes
a reduction
of 36% in
maximum
power
output.)
Motor starts slowly
or fails to come up
to full speed°
Motor
overheats.
Starting switch in
motor wilt not operate.
Motor stalls
(resulting
in blown
fuses or tripped
circuit
breakers)
Frequent opening of
fuses or circuit
breakers,
PROBABLE CAUSE
I
1 Motor
1
t Circuit overloaded
with
1,
lights, appliances
and
other motors.
2 Undersize wires or circuit
2
too long
3, General overloading
of
3
power company
facilities
1. Low voltage
1
2 Windings
burned out
2,
or open
3 Starting switch not
3
operating.
t Motor overloaded
2 Improper
cooling
(Air
2,
circulation
restricted
through
motor due to
sawdust accumulation,
"1 Burned switch contacts
1
(due to extended
hold-in
periods caused by low Iine
voltage, etc,)
2 Shorted capacitor
2
3 Loose or broken
3
connections.
1
1 Starting switch not
operating
2 Voltage too low to permit
2
motor to reach operating
sReed
3, Fuses or circuit
breakers
3
do not have sufficient
capacity.
1 Motor overloaded
2 Fuses or circuit
breakers
REMEDY
Have motor checked
by qualified
service
technician.
Repair service is available at your
nearest Sears store,
Do not use other appliances
or motors on
same circuit when using the saw
Increase wire sizes, or reduce length of wiring
See "Motor
Specifications
and Electrical
Requirements"
section,
Request a voltage check from the power
company
Request voltage check from the power
company,
Check size of circuit
wiring
Have motor repaired or replaced
Blow out sawdust from motor
Have motor
repaired.
Feed work slower into blade,
Clean out sawdust to provide normal air
circulation
through
motor
See "Maintenance
and Lubrication"
section
Have switch replaced and request a voltage
check from the power company
Have capacitor
tested and replace if defective.
Have wiring checked
and repaired
Have switch replaced
Request voltage check from the power
company
Install proper size fuses or circuit
breakers,
capacityd°
not have sufficient
I 3
3 Starting switch not
Have switch replaced
Blow out sawdust,
l
Feed work slower into blade,
2 Install proper size fuses or circuit
breakers
Check that wiring will handle load
operating
(motor does not
reach speed)
31
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