9
2.1
Winding protector cut
out
2.2
PTC and protector
interaction
2.3
Check of winding
protector and
resistance
2.
FINDING FAULTS
If the compressor will not run, this may be due to a number of reasons. Before replacing the compressor,
make sure that it is defective. To easily determine the fault, please refer to Guideline
"Repair of Hermetic Refrigeration Systems".
If the winding protector cuts out while the compressor is cold, it can take approx. 5 minutes for the protector
to reset. If the winding protector cuts out while the compressor is warm (compressor housing above 80 °C /
176 °F) the resetting time is increased. Up to approx. 45 minutes may pass before reset.
The PTC starting unit requires a cooling time of 5 minutes before it can restart the compressor with full
starting torque. Short time power supply cut offs, not long enough to allow the PTC to cool down, can result
in start failure for up to 1 hour. The PTC will not be able to provide full action during the first protector resets,
as they typically do not allow pressure equalization. Thus, the protector trips until the reset time is long
enough. This can be solved by unplugging the appliance for 5 to 10 minutes typically.
In the event of compressor failure, a check is made by measuring resistance directly on the current lead-in
to see whether the defect is due to motor damage or simply a temporary cut out of the winding protector.
If tests with resistance measurement reveal a connection through the motor windings from point M to S of
the current lead-in, but a broken circuit between point M and C and S and C, this indicates that the winding
protector is cut out. If so, wait to reset.
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