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Motor - 2
Problem
Probable
Cause
What
to Do
Motor
fails to develop
full
power.
(Power
output
of motor
decreases
rapidly
with
decrease
in voltage
at
motor terminals.
For ex-
ample:
a reduction
of
10% in voltage
causes a
reduction
of 19% in maxi-
mum power
output
of
which the motor
is
capable,
while a reduction
of 20% in w)ltage
causes
a
reduction
of 36% in maxi-
mum power
output.)
Power line overloaded
with
lights, appliances,
and other
motors.
Reduce
the line load.
Undersize
wires or circuit too
long.
Increase
wire sizes, or reduce
length
of wiring.
General
overloading
of power
company's
facilities.
(In many sections
of the
country,
demand
for electrical
power
exceeds
the capacity
of
existing generating
and distribu-
tion systems).
Request a voltage check from
power company.
Motor
overheats.
Excessive feed rate when
crosscutting
or ripping.
Slow down rate of feed.
Improper
cooling.
(Air circulation
restricted
through
motor
due to sawdust,
etc.)
Clean out sawdust
to provide
normal
air circulation
through
motor.
Saw blade has heel.
Refer to Making Blade Parallel
to Table section.
Motor starts slowly or
fails to come up to full
speed.
Starting
switch will not trip due
to low voltage.
Correct
low voltage
condition.
Motor
stalls resulting
in
blown fuses or tripped
cir-
cuit breakers.
Voltage
too low to permit
Correct
the low line voltage
con-
motor
to reach operating
speed,
dition.
Fuses or circuit breakers
do not
Replace
fuses or circuit
have sufficient
capacity,
breakers
with proper
capacity
units.
Frequent
opening
of fuses
or circuit breakers.
Motor
overloaded.
Fuses or circuit breakers
do not
have sufficient
capacity.
Reduce
motor load.
Replace
fuses or circuit
breakers.
92
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