LOW VOLTAGE MOTORS - Installation, operation, maintenance and safety manual - rev. 01 - 1.07.2016
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8. TROUBLESHOOTING
These instructions do not cover all details or variations in equipment nor provide for every possible condition to be met in connection with installation,
operation or maintenance.
Motor troubleshooting chart
Your motor service and any troubleshooting must be handled by qualied persons who have proper tools and equipment.
TROUBLE CAUSE SOLUTION
Motor fails to
start
Blown fuses Replace fuses with proper type and rating
Overload trips Check and reset overload in starter
Improper power supply Check to see that power supplied agrees with motor rating plate and load factor
Improper line connections Check connections against diagram supplied with motor
Open circuit in winding or
control switch
Indicated by humming sound when switch is closed. Check for loose wiring connections.
Also ensure that all control contacts are closing
Mechanical failure
Check to see if motor turn freely.
Check bearings and lubrication
Short circuited stator
Indicated by blown fuses.
Motor must be rewound
Poor stator coil connection Remove end shields, locate fault
Rotor defective Look for broken bars or end rings
Motor may be overloaded Reduce load
Motor stalls
One phase may be open Check lines for open phase
Wrong application Change type or size,consult equipment supplier
Overload Reduce load
Low voltage Ensure the rating plate voltage is maintained,check connection
Ooen circuit Fuses blown, check overload relay, stator and push buttons
Motor runs and
then dies down
Power failure Check for loose connections to line, to fuses and to control
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