LG AMNW07GSJA0 Svc Manual page 98

6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)
Checking compressor phase resistance
Judgment of the fault of the
Purpose
■ How to check the insulation resistance between the compressor and panel
C/Box Panel
1. Turn the switch of the tester to "Resistance" mode and check the resistance
2. Measure the resistance between the terminals.
3. "0 Ω" means the short of compressor phase. (Replace the compressor)
4. Refer to the compressor resistance standards.
5. If any disorder is found, measure the line resistance between the terminals of the compressor as shown
below.
6. If the compressor is found to be normal, any compressor connection wire may have a fault.
■ How to check the U, V, and W phase resistance
Compressor
terminals
Model
Windings
Resistance
(at 25 ℃)
Windings
Resistance
(at 75 ℃)
compressor.
Compressor
terminals
DKT156MAD
U-V 1.330±7 % Ω
V-W 1.330±7 % Ω
W-U 1.330±7 % Ω
U-V 1.620±7 % Ω
V-W 1.620±7 % Ω
W-U 1.620±7 % Ω
1. Measurement of insulation resistance
Items for checking
2. Measurement of phase resistance.
3. Wiring Check.
Measure the resistance between a compressor terminal
and panel.
CompPipe
Measure the line resistance between the compressor
terminals.
DKT208MAB
1.125±7 % Ω
1.125±7 % Ω
1.125±7 % Ω
1.345±7 % Ω
1.345±7 % Ω
1.345±7 % Ω
- 97 - Copyright © 2016 - 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
5. Trouble Shooting
between the compressor and panel.
Insulation
Terminal
Resistance
U-panel
V-panel
W-panel
RJB036MAB DJT240MAA
0.529±7 % Ω 0.628±7 % Ω
0.529±7 % Ω 0.628±7 % Ω
0.529±7 % Ω 0.628±7 % Ω
0.631±7 % Ω 0.758±7 % Ω
0.631±7 % Ω 0.758±7 % Ω
0.631±7 % Ω 0.758±7 % Ω
≥ 10 MΩ
≥ 10 MΩ
≥ 10 MΩ