Trane GGAA, Installation, Operation And Maintenance Manual

Page: 39 / 60

MUA-SVX005B-EN 39
Problem Probable
Cause
Solution
Motor overloaded Reduce load or replace motor.
With a 3 phase
power source, one
phase may be
open
Check line for open phase.
Defective capacitor Replace capacitor.
Motor Stalls Wrong application Consult manufacturer.
Overloaded motor Reduce load or replace motor.
Low line voltage. Check across AC line and correct if possible.
Motor runs and
then dies down
Partial loss of line
voltage
Check for loose connections. Determine
adequacy of main power supply.
Motor does not
come up to speed
Motor undersized
for application
Replace with larger motor.
Voltage too low at
motor terminals Check across AC line and correct if possible.
Line wiring to
motor is too small
Install larger line wiring.
Motor takes too
long to accelerate
Excessive load Replace with larger motor.
Loose connection Check connections and tighten where
necessary.
Wrong Rotation (3
Phase) Improperly wired
to AC line (wrong
sequence of
phases) Check unit wiring diagram. Reverse any two
line voltage connections.
Motor Overheats Motor overloaded Replace with larger motor.
Motor ventilation
clogged
Clean motor.
Motor (3 phase)
may have open
phase Check to insure that all connections are tight.
Line voltage too
high or too low Check across AC line and correct if possible.
Worn blower
bearings.
Replace blower bearings.
Motor Vibrates Motor mounting
bolts loose Tighten mounting bolts.
Driven equipment
unbalanced
Balance driven equipment.
Worn motor
bearings.
Replace motor.
3 phase Motor
running on single
phase Check for open circuit and correct.
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