TM 5-4310-362-14
Problems in the motor control circuitry will usually cause the motor to stop running.
Note that there has to be current through the coil for contacts E1 and E2 to close. This means that the motor won't run if
the coil circuit is bad even though the rest of the circuit is good.
Overload conditions will cause the overload relay contact to open. Overloading may be caused by shorts in the motor or
by a blockage in the compressor. Overload conditions must be removed before the compressor can be put back in
operation. Otherwise, the relay will just open up again.
Once overload conditions have been eliminated, the RESET button on the motor control box can be pushed to start the
compressor back up.
6-3.
TROUBLESHOOTING CHART
MALFUNCTION. Malfunctions listed are the ones most likely to happen. Not all possible malfunctions can be
forseen and listed.
TEST OR INSPECTION. Tests or inspections are listed to help you find the cause of the malfunction. The tests
that are easiest to do are listed first. The tests that are hardest to do are listed last.
CORRECTIVE ACTION. Corrective actions are listed to help you eliminate the malfunction. Where the corrective
action is too complicated to be listed in full detail, the paragraph number of the detailed procedure is given in
parentheses.
Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ELECTRIC MOTOR WON'T START
Step 1.
Check to see that main power switch is on.
Turn on power
Step 2.
Press RESET button on electric starter.
Reset button will start motor only if relay was tripped by momentary overload.
6-2
