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Swimming Pool Motors, Trouble Shooting Guide

Swimming Pool Motors, Troubleshooting

Pool Motors

When Selecting a motor for replacement, begin with the nameplate on the motor, key factors`tors include the frame type, voltage, RPM's and Service factor, match the replacement to the specifications on the nameplate. If a motor has failed and is less than 3-4 years old, there might exist some external factor such as a pump running without water, or a filter being sized to small. If this is the case one should determine that the original motor was the correct one:

Was the original motor installed correctly, particularly regarding the electrical connections? Was the power supply correct? Was the motor the proper size, speed, horsepower? Was the motor and pump impeller matched correctly? Was the filter sized correctly; Is the pressure of the filter within the operating range suggested by the manufacturer?

Trouble Shooting Motors

Swimming Pool Motors

Possible Causes
Possible Solution
Motor Fails to Start Blown Fuses Replace fuse with at least 125% of nameplate amperes.
  Improper Current Supply Check to see that power supplied agrees with motor nameplate and load factor.
  Improper line connections Check connections to determine if they agree with the motor nameplate and that they match the incoming voltage
  Mechanical Failure Check to see if motor and drive turn freely
  Shorted Circuited stator Motor be be rewound or replaced
  Rotor Defective Look for broken bars or end rings
  Motor may be overloaded Reduce load, clean filter, increase filter size, replace motor with more Horsepower.
  Defective Capacitor Check for short circuit, grounded or open capacitor
Motor Stalls Wrong Application Change type and size of motor.
  Overloaded Motor Reduce Load
  Low Motor Voltage See that motor nameplate voltage is maintained
  Open Circuit Fuses Blown, check overload relay, stator and push buttons if applicable
Motor Runs and then Dies Down Power Failure

Check for loose connections, overheating, or blown fuse

Motor Does not Come Up to Speed Voltage too low at motor terminals Use Higher voltage on transformer terminals
  Starting load to high Check load motor is supposed to start
Motor Takes to Long to accelerate Excess Loading Reduce Load
  Poor Circuit Check for High Resistance
  Defective Squirrel Cage Motor Replace with new motor
  Applied voltage to low Get Power company to increase power tap
Motor Overheats while running under load. Overload Reduce Overload
  Wrong Blowers or Air Shields Clean motor vents
  Grounded Coil Locate and repair or replace
  Unbalanced terminal voltage Check for faulty leads, connections and transformers
  Shorted stator coil repair and the check wattmeter reading
  Faulty Connection Indicated by high resistance.
  High voltage check terminal of motor with a voltmeter.
  Low Voltage Check terminals of motor with a voltmeter.
  Rotor Rubs Stator bore Replace worn bearings.

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