Trane LWHA Installation Operation & Maintenance page 22

TRANE ®
Symptom
Bearing is excessively hot
Motor fail to start
Motor stalls
Excessive vibration
Motor runs and then dies down
Motor does not come up to speed.
Motor overheats
Excessive motor noise.
LWHA Series
Trouble Analysis
Probable cause
Over tensioned belts.
No lubricant / lubrication dry-out
Misaligned bearing.
Blown fuse or open circuit breaker.
Overload trip.
Inproper wiring or connections.
Improper power supply.
Mechanical failure.
Open phase.
Overloaded motor.
Low line voltage.
Over tensioned belts
Misaligned drive
Partial loss of line voltage.
Stator shorts when motor warms up.
Low voltage at motor terminals.
Line wiring to motor too small.
Overloaded motor.
Motor fan is clogged with dirt
preventing proper ventilation.
Motor mounting bolts loose.
Worn motor bearings.
Fan rubbing on fan cover.
19
Recommended Action
Adjust tension.
Replace bearing.
Correct alignment. Check shaft level.
Replace fuse or reset circuit breaker.
Check and reset overload.
Check wiring with diagram supplied on
unit.
Compare actual supply power with
motor nameplate recommendations.
Contact power company for adjust-
ments.
Check that motor and driver rotate freely.
Check line for an open phase.
Reduce load or replace with larger
motor.
Check across AC line. Correct voltage
if possible
Adjust belts tension.
Align drive.
Check for loose connections.
Determine adequacy of main power
supply.
Replace stator / motor.
Check across AC line and correct volt-
age loss if possible.
Replace with larger sized wiring.
Reduce load or replace with a larger
motor.
Remove fan cover, clean fan and re-
place cover.
Tighten motor mouting bolts.
Replace bearing.
Remove interference in motor fan
housing.