K4563 11/08/12
7
12. Motor winding re sis tance read ings.
a. Disconnect all three motor leads from panel
terminal blocks.
b. Using a volt-ohmmeter, with the scale set on
RX1, measure the resistance be tween the
leads with the chart.
Winding
Resistance Reading
Main
Lowest
Start
Next
Lowest
(Middle)
Both
Highest
(Main & Start)
13. Capacitor check.
a. Make sure the ca pac i tor is dis charged. Use
extreme caution as a spark might occur.
b. Disconnect the ca pac i tor leads and connect
an analog-type volt-ohmmeter to the
capacitor terminals.
c. Set the meter on the RX1,000 scale to check
the start ca pac i tor. Set the meter on the
RX10,000 scale to check the run ca pac i tor.
d. The meter should in di cate low ohms when it is
first connected, but as the ca pac i tor becomes
charged (by the meter), it will return to a
reading of infinity (open circuit).
14. Start relay check.
a. Check the coil re sis tance. It should be 3,000
to 15,000 ohms.
b. Install a clamp on amp meter around the start
wind ing lead.
c. Set the amp meter scale to at least 2 times
the pump motor full load current.
d. Place the H-O-A switch in the Hand position
to start the pump.
e. The meter should read ap prox i mate ly 2 times
full load current during starting.
f. After the motor has started (within one
second) the cur rent should drop to a value
much less than full load cur rent.
15. Motor voltage check:
Component
Mode
Voltage
Reading
Main Winding
Start
Line Voltage
Main Winding
Run
Line Voltage
Start Winding
Start
Line Voltage
Start Winding
Run
120%
Line Voltage
