Troubleshooting - LG AR-DR11-08A Installation And Operation Manual

TROUBLESHOOTING

Troubleshooting
Motors
Table 65: Troubleshooting Motors Table.
Motor Symptom
Motor doesn't start
Motor doesn't come up to speed
Motor takes too long to accelerate to
speed.
Motor rotates in wrong direction
Motor vibrates excessively.
Motor overheats
106
Probable Cause
Blown fuse or open circuit breaker.
Overload trips.
Improper line connections.
Open circuit in winding or starting switch;
humming sound from motor when switch is
closed.
Improper current supply.
Mechanical failure.
Motor overload.
Power source (3-phase) may have one phase
open.
Power may have phase reversed.
Fan VFD in OFF or HAND position.
Motor under-designed for the application.
Voltage too low at motor terminals.
Line wiring to motor too small.
60-Hz motor connected to 50-Hz line supply.
Motor wired for wrong voltage.
Excessive load.
Loose connection(s).
Improperly wired to AC line; wrong sequence
of phases.
Motor mounting bolts are loose.
Impeller is unbalanced.
Motor overloaded.
Motor fan may be clogged with dirt, preventing
proper ventilation.
Motor (3-phase) may have one phase open.
Line voltage too high.
Line voltage too low.
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Action
Replace fuse or reset circuit breaker.
Check and reset overload.
Check connections on diagram supplied with motor.
Replace motor.
Check that power supply agrees with motor
specifications listed on nameplate.
Determine that motor turns freely; if not, replace
motor.
Reduce load.
Check line for open phase.
Check phase volt monitor and reverse the phase
wiring.
Check VFD display screen and set VFD to "Auto".
Replace with larger motor.
Check across AC line and correct if possible.
Install larger wiring.
Replace unit with 50-Hz motor.
Check wiring.
Consult the factory.
Check connection and tighten where necessary.
Check wiring diagram on motor nameplate and
correct; reverse any two motor leads at line
connection.
Tighten mounting bolts.
Replace impeller.
Replace with larger motor.
Remove fan cover and clean; replace fan cover.
Check that all connections are tight.
Check across AC line. Consult power company;
step-down transformer may be required.
Check across AC line. Consult power company;
step-up transformer may be required.