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BC0530 Service Manual
Test Procedure for Continuity and Proper
Resistance
1. If no ground fault has been found, determine if
there is an open or short circuited motor winding
or if the thermal protector is open.
2. Allow time for the thermal protector to reset. This
may take as long as an hour for internal type
thermal protectors.
3. For single phase compressors, test the continuity
of the start winding by measuring between
terminal pins C and S. Test the continuity of the
main winding by measuring between terminal pins
C and R. If there is no continuity in either winding,
replace the compressor.
4. If continuity is found in all motor windings,
measure the resistance (ohms) of the windings.
5. For single phase compressors, measure between
each pair of terminal pins: C-S, C-R and S-R.
The sum of the resistance measured between
C-S and C-R should equal the resistance
measured between S-R, plus or minus a small
deviation. Proper resistance may be confirmed
by comparing the measured resistance to the
resistance specifications for specific compressor
models. If the resistance is not correct, replace
the compressor. If the specifications are not found
on the ice machine, please contact the factory.
Test Procedure for Compressor Electrical
Components
Testing The Potential Relay:
1. Before testing the relay, be sure it is the one
specified for use with the ice machine compressor
and the mounting position of the relay is correct.
2. Measure for continuity between terminals 5 and
2—if there is no continuity, replace the relay.
3. Measure for continuity between terminals 2 and
1—if there is no continuity, the contacts are open
and the relay must be replaced.
4. The relay may also malfunction if the supply
voltage is 10% higher or lower than the rated
voltage or if the relay is loosely mounted, allowing
it to vibrate or if it is used in conjunction with an
incorrect start capacitor.
Testing the Run Capacitor:
1. Before testing the run capacitor, be sure it is
the one specified for use with the ice machine
compressor.
2. After making sure the capacitor is discharged,
disconnect it and test the value with a capacitance
meter. If the measured value is more than 10%
higher or lower than the rated value, replace the
run capacitor.
3. The capacitor may also malfunction if the supply
voltage is more than 10% higher than the rated
voltage.
Testing the Start Capacitor:
Before testing the start capacitor, be sure it is the one
specified for use with the ice machine compressor.
1. After making sure the capacitor is discharged,
disconnect it and test the value with a capacitance
meter. If the measured value less than the rated
value or more than 20% higher than the rated
value, replace the start capacitor.
2. As an alternative, test the run capacitor by
determining if there is continuity across the
terminals. Use a meter set to the R x 1 scale. If
there is continuity the capacitor is shorted and
must be replaced.
3. Another alternative is to set the meter to the R x
100,000 scale. If there is no needle deflection on
an analog meter when placing the probes across
the capacitor terminals or if infinite resistance is
indicated on a digital meter, the capacitor is open
and needs to be replaced.
4. The capacitor may also malfunction if the relay
contacts are not working properly, or if the
capacitor is subjected to prolonged operation of
the start cycle, because the start relay is incorrect,
the starting load is too high, or the supply voltage
is more than 10% lower than the rated voltage.
\
March 2020
Page 30
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