Trane CAH-SVX01A-EN Benutzerhandbuch

56

 CAH-SVX01A-EN

This section is intended to be used 
as a diagnostic aid only. For detailed 
repair procedures, contact your local 
Trane service representative.

Bearing is 
excessively hot

First start after relubrication (grease distribution) Allow machine to cool down and restart.
Over-lubrication

Clean surface of grease and purge.

Over tensioned belts 

Adjust belt tension.

No lubricant 

Apply lubricant. Check bearings for damage.

Misaligned bearing 

Correct alignment. Check shaft level.

Motor fails to start

Blown fuse or open circuit breaker

Replace fuse or reset circuit breaker.

Overload trip 

Check and reset overload.

Improper wiring or connections 

Check wiring with diagram supplied on unit.

Improper current supply 

Compare actual supply power with motor nameplate 
recommendations. Contact power company for adjustments.

Mechanical failure 

Check that motor and drive rotate freely. Check bearing lubricant.

Motor stalls

Open phase 

Check line for an open phase.

Overloaded motor 

Reduce load or replace with larger motor.

Low line voltage 

Check across AC line. Correct voltage if possible.

Excessive vibration

Poor alignment 

Align bearing set screws (see Figure 49). Loosen and retighten 
bearing set screws.

Bolts not removed. 

Remove bolts (see the “Isolator Adjustment” section on page 24).

Over tensioned belts 

Adjust belt tension.

Misaligned drive 

Align drive.

Motor runs and then 
dies down 

Partial loss of line voltage 

Check for loose connections. Determine adequacy of main power 
supply.

Starter shorts when motor warms up 

Replace starter.

Motor does not come 
up to speed

Low voltage at motor terminals 

Check across AC line and correct voltage loss if possible.

Line wiring to motor too small 

Replace with larger sized wiring.

Motor overheats

Overloaded motor 

Reduce load or replace with a larger motor.

Motor fan is clogged with dirt preventing proper 
ventilation 

Remove fan cover, clean fan and replace cover.

Excessive motor 
noise

Motor mounting bolts loose 

Tighten motor mounting bolts.

Rigid coupling connections 

Replace with flexible connections.

Worn motor bearings 

Replace bearings and seals.

Fan rubbing on fan cover 

Remove interference in motor fan housing.

Rapid motor bearing 
wear

Excessive overhung load due to overtensioned 
drive 

Check belt tension and overhung load.

Excessive overhung load due to a small diameter 
motor sheave 

Replace sheave with larger one.

Loose fan belt

Motor is poorly positioned 

Adjust belt tension.

Worn or damaged belt 

Replace belt or belt set. Check sheave alignment.

Worn sheaves 

Replace sheaves.

