Power Soak SI-100 Owner's Manual - Manual (Page 26)

25
Component Operation and Checks
Pump Contactor/Overload
Verify that the contactor/overload has the correct thermal units as shown on the wiring
diagram for the horsepower and voltage. Always determine the horsepower from the data
plate on the motor. The serial plate may not be correct.
It is difficult to see the labeling on some of the terminals. Their locations are listed below:
• A1 Top right with the blue wire connected to it
• A2 Top left with the red wire connected to it
• COM Bottom left with the white wire connected to it
• OL Bottom left with the red wire connected to it
The contactor/overload can be checked as follows:
1. Push the “Start” button. If the contactor pulls in, go to step 7.
2. Check for 20-28v between COM on the contactor/overload and X1 on the
transformer. If not, check your breaker, fuses, wiring, and transformer.
3. Check for 20-28v between OL on the contactor/overload and X1 on the transformer.
If not, the reset is tripped or the contactor/overload is defective.
4. Check for 20-28v between A2 on the contactor/overload and X1 on the transformer.
If not, trace the wire to terminal OL on the motor contactor/overload and make the
necessary repair.
5. Push the “Start” button. Check for 20-28v between A1 on the contactor/overload
and X2 on the transformer. If not, check the timer and wiring and make the
necessary repair.
6. If the voltage checks out in steps 4 and 5 and the coil does not pull in, the
contactor/overload is defective.
7. TURN POWER OFF AT BREAKER PANEL. Make sure all connections on
contactor/overload are tight.
8. Remove the wires from terminals T1, T2, and T3 on the contactor/overload.
9. Push the contactor closed manually and check for continuity across pump contactor
terminals L1 and T1, L2 and T2, L3 and T3. If no continuity on any of these, the
contactor/overload is defective.