Filter
Top Products
U.S. ELECTRICAL MOTORS
INSTALLATION AND MAINTENANCE
CORRECTION
Check source of power supply. See
Safety instructions! Check overloads,
controls and fuses. Check voltage,
compare with nameplate voltage.
Disconnect motor from load to verify if
motor starts without load. Reduce
load-or replace motor with motor of
greater load capacity.
Check input voltage and proper motor
lead connection.
Balance rotor assembly.
Remove rotor assembly and clean
motor.
Replace bearing and regrease per
lubrication section.
Realign motor per initial installation
section.
Disconnect motor from driven equip-
ment. See section on safety. Run
motor unconnected and check vibra-
tion. If vibration drops dramatically,
then the driven equipment or align-
ment may be the cause of vibration.
Check base vibration level with motor
stopped.
Revise rigidity of motor base structure.
Balance rotor assembly.
Realign couplings, inspect couplings.
See initial installation section.
Realign unit. See initial installation
section.
Reduce belt tension.
Reduce thrust from driven machine.
Recheck alignment. See initial
installation section.
Relieve bearing cavity of grease to
level specified in lubrication section.
TROUBLE
Motor will not start
Excessive motor humming
Noise
Clicking
Rapid knocking
Vibration
Vibration
"following motor repair"
Fine dust under coupling with rubber
buffers or pins
Bearing overheating
XIV. TROUBLESHOOTING
Troubleshooting
POSSIBLE CAUSE
Does not rotate. Usually line trouble
single phasing at starter.
Rotates but does not come up to
speed. Load too heavy.
High voltage
Unbalanced rotor
Contaminants in air gap
Bad bearing; contaminated grease
Misalignment in coupling or feet
Vibration in driven equipment
Ambient Vibration
System natural frequency (resonance)
Rotor out of balance; balance weights
or fans shifted on rotor.
Misalignment
Misalignment
Excessive tension in belt drive
Excessive end thrust
Too much grease in bearing
16