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When troubleshooting a pump system, the following will be helpful in the field:
When working around electrical equipment, think safety. The wrong move can have dangerous consequences. Use the panel disconnects to remove system power. Use your voltage meter to verify that the system's power has been deactivated.
Objective...Determine where the problem lies:
The following steps will assist in efforts to isolate the problem area:
Step 1: Make a visual overview of the system
Familiarize yourself with the system components.
Verify the pump voltage to the system power source.
Pump capability vs. system characteristics
Verify that all electrical connections to the panel are correct.
Inspect the system for abuse or damage.
Inspect every inch of cordage for damage.
Review the start-up report's installation check list.
Check the supply voltage at the panel.
Check the control voltage.
Check the alarm circuit with test switch, jumper or float.
Step 5: Operate each pump by placing the selector switch in "hand" mode.
Check the pump run light.
Take an amp and voltage reading with the pump running.
Check for proper rotation (3 phase system).
Step 6: Simulate float switch operation with jumper wires. Repeat numerous lead/lag cycles.
Take a voltage reading with both pumps operating.
Step 7: Check motor windings. Must disconnect from panel.
Check resistance through each winding.
Check each motor lead to ground. There should be no continuity.
Check insulation with megohmmeter, should be greater than 10 continuity.
During the above steps, stop and investigate if you detect a malfunction. If all components operate correctly throughout the above steps, you may want to check the float switches and all junction box connections (if applicable).