Checking The Outdoor Unit Fan Motor - LG Multi V5 Service Manual

because voltage, power supply current, or inverter output has no sine waveform. Also, output voltage changes when inverter
output voltage has a pulse wave pattern.
1. If using a movable tester to check if inverter output voltage is constant (when comparing relative voltage between lines), always use an analog me-
ter. Exercise particular caution if the inverter output frequency is low, when using a tester, where the change of measured voltage values is large
2.
Accurate measuring values cannot be obtained with a general movable tester (for analog and digital mode).
Checking the Outdoor Unit Fan
If there is a fan error, check the items below and follow the corresponding procedure listed.
Check Problem
1. Fan motor is not
Power supply is not
operating. (Does
correct.
fan motor fail
again when opera-
tion starts?)
Wiring is wrong.
2. Fan motor
vibration is exces-
sive.
Motor has failed.
Fuse is defective.
Circuit board is
defective.
CHECKING THE OUTDOOR UNIT FAN
Check wire connections at the breaker.
Modify the power supply voltage if it is beyond permissible specifications.
• Check wiring connections.
• Check connector contacts.
• Check that all components are firmly secured (tighten screws).
• Check polarity connection.
• Check ground wiring and for short circuits.
Measure the winding resistance of the motor coils.
208V/230V, 60Hz,
Power Supply
Rating Output
Motor Resistance
at 167°F
Replace the fuse.
Replace the circuit board following the steps below if errors occur again after resetting the
power, and if there are no errors similar to those specified above.(Carefully check both connec-
tor and ground wires when replacing the circuit board.)
• Replace only the fan control board. If operation begins, then the fan control board was
defective.
• Check and replace inverter board and / or main board if fan operation continues to fail.
• If problems continue to occur even after following the procedures above, then both boards
are defective.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Solution
Small Frame
460V, 60Hz,
3-phase 3-phase
1,500 W 1,200 W
Large Frame
208V/230V, 60Hz, 460V, 60Hz,
3-phase 3-phase
900 W 900 W
115