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SYMPTOM
Motor fails to start
Motor stalls
Excessive vibration
Bearing(s) hot
Motor does not run at
full speed
Motor overheats
Excessive motor noise
Motor runs and then slows
Excessive motor bearing wear
Loose Fan Belt
Drive Noise
No Power to Unit
Table 51 — Unit Troubleshooting
POSSIBLE CAUSES
Power line open
Improper wiring or loose connections
Overload trip
Mechanical failure
Improper current supply
Open phase
Overloaded motor
Low line voltage
Bearing/shaft misalignment
Shipping blocks/spacers not removed
Excessive belt tension
Drive misaligned
Grease not evenly distributed after lubrication
Over-lubrication
No lubricant
Misaligned bearing
Low voltage at motor terminals
Supply wiring to motor too small
Overloaded motor
Motor fan is clogged, preventing motor cooling
Mounting bolts loose
Rigid coupling connectors
Worn motor bearings
Fan rubbing on housing
Partial supply voltage loss
High load due to over-tensioned drive
Excessive overhung load caused by a small
diameter motor sheave
Improper motor position
Worn sheaves
Worn or damaged belt
Sheave(s) not tight on fan/motor shaft(s)
Belts contacting guard(s)
Belts too loose or too tight
Belts and sheaves mismatched
Belts not length matched (multiple belt set-up)
Misaligned sheaves
Belts worn
Belts dirty or oily
Power switch in wrong position.
Circuit breaker tripped
Fuse blown
Reset circuit breaker.
Check wiring and connections.
Check and reset overload.
Inspect motor and drive for operation and/or damage.
Check rating plate against actual supply voltage. Contact
power provider for adjustments if needed.
Check line for open phase.
Reduce motor load or replace with larger motor.
Check supply line, correct voltage.
Check and align bearing set screws.
Remove shipping blocks/spacers.
Adjust belt tension.
Align drive.
Allow unit to cool down and restart.
Clean and purge excess grease.
Check bearings for damage and apply lubricant.
Check shaft level and reset alignment.
Check supply voltage and correct voltage loss.
Rewire with properly sized wire.
Reduce motor load or replace with larger motor.
Clean motor fan.
Tighten bolts.
Replace with flexible connectors.
Replace bearings and seals.
Adjust housing.
Check for loose/dirty connections.
Verify supply voltage.
Check belt tension and load.
Replace with larger sheave.
Adjust tension.
Replace sheaves.
Check sheave alignment and replace belt(s).
Tighten sheaves.
Adjust or tighten belt guard mounts.
Adjust belt tension.
Install proper belts.
Install matched belts.
Align sheaves.
Replace belts.
Replace belts.
Verify SPP power switch handle is in the proper position.
Reset SPP circuit breakers.
Inspect SPP fuses.
269
POSSIBLE REMEDIES
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