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 Use the following table to troubleshoot pump conditions with an ammeter.
Remember to start with the highest scale and move downward until the amperage
reading is in the upper half of the scale.
TABLE 4-5: Current Readings and Pump Problems
Inspect for:
If Ammeter Reads:
Power supply problem
Zero
Control problem
Relay or starter problem
Broken motor lead
Thermal overload tripped
Motor problem
Too low
Broken or slipping shaft
(1/4 to 1/2 times
specifications)
Airbound loop
Correct amount
Closed valve, backwards check
valve
Broken or slipping shaft
Direction of motor rotation
Misaligned shaft
Too high
Worn bearings
(1 1/4 to
Foreign matter in volute
1 1/2 times
Impeller against volute wall
specifications)
Motor problem
Locked rotor problem
Much too high
(2 or more times
specifications)
damage from excessive current draw.
TROUBLESHOOTING
124
4.3 TROUBLESHOOTING OPERATIONS
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