Trane GGAA Installation, Operation And Maintenance Manual page 39

Problem
Motor Stalls
Motor runs and
then dies down
Motor does not
come up to speed
Motor takes too
long to accelerate
Wrong Rotation (3
Phase)
Motor Overheats
Motor Vibrates
MUA-SVX005B-EN
Probable Solution
Cause
Motor overloaded Reduce load or replace motor.
With a 3 phase Check line for open phase.
power source, one
phase may be
open
Defective capacitor Replace capacitor.
Wrong application Consult manufacturer.
Overloaded motor Reduce load or replace motor.
Low line voltage. Check across AC line and correct if possible.
Partial loss of line Check for loose connections. Determine
voltage adequacy of main power supply.
Motor undersized Replace with larger motor.
for application
Voltage too low at Check across AC line and correct if possible.
motor terminals
Line wiring to Install larger line wiring.
motor is too small
Excessive load Replace with larger motor.
Loose connection
Check connections and tighten where
necessary.
Improperly wired Check unit wiring diagram. Reverse any two
to AC line (wrong line voltage connections.
sequence of
phases)
Motor overloaded Replace with larger motor.
Motor ventilation Clean motor.
clogged
Motor (3 phase) Check to insure that all connections are tight.
may have open
phase
Line voltage too Check across AC line and correct if possible.
high or too low
Worn blower Replace blower bearings.
bearings.
Motor mounting
Tighten mounting bolts.
bolts loose
Driven equipment Balance driven equipment.
unbalanced
Worn motor
Replace motor.
bearings.
3 phase Motor Check for open circuit and correct.
running on single
phase
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
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