LG Multi-Inverter Service Manual page 112

Check Point
1. Check the Tab1 connection condition. (Refer to outdoor wiring diagram)
2. Check the CN_L1(R), CN_L2(S), CN_L3(T) connection condition
3. Check the DC Link voltage at not operating(380V¡è )
4. Check the DC Link voltage at Comp operating(500V¡è )
5. Check DC Link Sensing Signal (Refer the Picture)
<INVERTER PCB>
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Only for training and service purposes
GND
Tester
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4. Trouble Shooting
Vdc
500Vdc ±10%
<DC Link Voltage Check Point>
GND GND GND
DC Link Voltage INV DC Link Voltage INV DC Link oltage INV
<INPUT VOLTAGE Check Point>
LGE Internal Use Only
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