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TROUBLE
SHOOTING
CHART--MOTOR
NOTE: Motors used on wood-working
tools
are particularly
susceptible to the accumula-
tion of sawdust and wood chips and should
be blown
out or "vacuumed"
frequently
to prevent interference
with normal
motor
ventilation.
TROUBLE
Motor will not run.
Motor will not run and
fuses "BLOW."
Motor
fails
to develop
full power. (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,
while a reduction of 20%
in voltage causes a reduc-
tion of 36% in maximum
power output.
Motor starts slowly or fails
to come up to full speed.
Motor
overheats.
Starting
relay in motor
will not operate.
Motor
stalls resulting in
blown fuses or tripped
circuit breakers.
Frequent opening of fuses
or circuit breakers.
1.
2.
1.
2.
1.
2.
3.
4.
1.
2.
1.
2.
PROBABLE CAUSE
Protector open; circuit
broken.
Low voltage.
Short circuit in line cord or
plug.
Short circuit in motor terminal
box or loose connections.
Power
line
overloaded
with
lights,
appliances
and
other
motors.
Undersize
wires or circuit
too
long.
General
overloading
of power
company's
facilities.
(In many
sections of the country,
demand
for
electrical
power
exceeds
the capacity
of existing
gen-
erating
and
distribution
systems.)
Incorrect
fuses in power
line.
Low voltage--will
not trip
relay.
Starting
relay not operating.
Motor overloaded.
Improper cooling. (Air circula-
tion restricted
through
motor
due to sawdust, etc.)
1. Burned relay contacts (due to
extended hold-in periods
caused by low line voltage,
etc.)
2. Open relay coil.
3. Loose or broken
connections
in motor terminal
box.
1. Starting
relay not operating.
2. Voltage too low to permit
motor to reach operating
speed.
3. Fuses or circuit breakers do
not have sufficient
capacity.
1. Motor
overloaded.
2. Fuses or circuit
breakers
do
not have
sufficient
capacity.
3. Starting
relay
not operating
/motor
does not reach
normal
speed.)
1.
2.
1.
2.
REMEDY
Reset protector by pushing in on red button, located
on top of motor junction box (indicated
by audible
click).
Check power line for proper voltage.
Inspect line cord and plug for damaged
insulation
and shorted wires.
Inspect all terminals in motor terminal box for loose
or shorted terminals.
1. Reduce line load.
2. Increase wire sizes, or reduce length of wiring.
3. Request a voltage check from the power company.
4. Install correct fuses.
1. Correct low voltage
condition.
2. Replace relay.
1. Correct overload condition.
2. Clean out sawdust to provide normal air circulation
through motor.
1. Replace
relay
and
check
line voltage.
2. Replace relay.
3. Check and repair
wiring.
1. Replace relay.
2. Correct the low line voltage
condition.
3. Replace fuses or circuit breakers with proper capacity
units.
1. Reduce motor load.
2. Replace fuses or circuit breakers.
3. Replace relay.
19
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