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Trouble Probable Cause Remedy
Machine will not
start/restart or
repeatedly trips
circuit breaker or
blows fuses.
(cont.)
Planer frequently trips.
One cause of overload trips which is
not electrical in nature is too heavy a
cut. The solution is to take a lighter
cut. If too deep a cut is not the
problem, then check the amp setting
on the overload relay. Match the full
load amps on the motor as noted on
the motor plate. If amp setting is
correct, there is probably a loose
electrical lead or a failed component.
See “Motor starter failure” below.
Building circuit breaker trips or fuse
blows.
Verify that the planer is on a circuit of
correct size. If circuit size is correct,
there is probably a loose electrical
lead. Also check amp setting on
motor starter.
Loose electrical connections.
Go through all of the electrical
connections on the planer including
motor connections, verifying the
tightness of each. Look for any signs
of electrical arcing which is a sure
indicator of loose connection or circuit
overload.
Failed or broken interlock switch.
Examine the switch and switch
housing for any sign of damage. If
damage is seen, replace components.
If the switch circuitry is suspect, you
have two options: have a qualified
electrician test the switch for function,
or purchase a new switch and
establish if that was the problem on
changeout.
Motor/starter failure (how to
distinguish).
Examine motor starter for burned or
failed components. If damage is
found, replace motor starter. If motor
starter looks okay but is still suspect,
you have two options: have a
qualified electrician test the motor
starter for function, or purchase a new
starter and establish if that was the
problem on changeout.
If you have access to a voltmeter, you
can separate a starter failure from a
motor failure by first, verifying
incoming voltage at 220+/-20 and
second, checking the voltage
between starter motor at 220+/-20. If
incoming voltage is incorrect, you
have a power supply problem. If
voltage between starter and motor is
incorrect, you have a starter problem.
If voltage between starter and motor
is correct, you have a motor problem.