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Swimming Pool Motors - Trouble Shooting

When Selecting a motor for replacement, begin with the nameplate on the motor, key fac`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 matced correctly.
Was the filter sized correctly, Is the pressure of the filter within the operating range suggested by the manufacturer.

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Trouble Shooting Motors
Trouble
Possible Causes
Possible Solution
Motor Fails to Start Blown Fuses Replace fuse with atleast 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 morot 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, gorunded or open cpacitor
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 Rersistance
  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 resitance.
  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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