Mechanical Troubleshooting - Jet JWP-16OS Owner's Manual

Mechanical Troubleshooting

Problem Possible Cause
Chain jumping. Inadequate tension.
Sprockets misaligned.
Sprockets worn.
Machine will No incoming power.
not start/ restart
Overload automatic
or repeatedly
reset has not reset
trips circuit
breaker or
blows fuses.
Planer frequently trips.
Building circuit breaker
trips or fuse blows.
Loose electrical
connections.
Motor starter failure.
Motor starter failure.
Motor failure.
Miswiring of the unit.
Adjust chain tension.
Align sprockets
Replace sprockets.
Verify unit is connected to power
When planer overloads on the circuit breaker built into
the motor starter, it takes time for the machine to cool
down before restart. Allow unit to adequately cool before
attempting restart. If problem persists, check amp setting
on the motor starter inside the electrical box.
One cause of overloading trips, which are 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 the
amp setting is correct then there is probably a loose
electrical lead. Check amp setting on motor starter.
Verify that planer is on a circuit of correct size. If circuit
size is correct, there is probably a loose electrical lead.
Check amp setting on motor starter.
Go through all the electrical 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
connections or circuit overload.
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 and 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.
If electric motor is suspect, you have two options: Have a
qualified electrician test the motor for function or remove
the motor and take it to a quality electric motor repair
shop and have it tested.
Double check to confirm all electrical connections are
correct and properly tight. The electrical connections
other than the motor are pre-assembled and tested at the
factory. Therefore, the motor connections should be
double checked as the highest probability for error. If
problems persist, double-check the factory wiring.
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Solution