LG Multi-Inverter Service Manual page 120

Display
Title
code
3-phase wrong wiring
54
of main outdoor unit
I Error Diagnosis and Countermeasure Flow Chart
Is PCB connection Normal?
Yes
Is input voltage normal ?
Yes
Recheck power and installation condition
R R R S S S T T
R S R S T N R S T N N
<Terminal Block&Fuse Check>
CN-L3(T) CN-L3(T) CN-L3(T) CN-L1(R) CN-L1(R) CN-L1(R)
CN-L2(S) CN-L2(S) CN-L2(S)
<INVERTER PCB Connection Check>
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Only for training and service purposes
Cause of error
• 3-phase wrong wiring of
outdoor unit (Reverse
Phase /omission of
phase)
No
No
N N N
Fuse
G G G
- 119 -
Check point & Normal condition
• Abnormal Main PCB
• No connection of CN_Phase
• Changed R, S, T connection order
1. Check the Connection condition of PCBs
1) Input &Output (R,S,T,N) wire Connection of Noise Filter.
2) Check reverse connecting and non connecting for
CN-L1(R), CN-L2(S), CN-L3(T) of the Inverter PCB
3) Check the CN-AC-220V Connector of the Inverter PCB
and T-N connector of the Noise Filter
2. Check the connection or damage of power source fuses.
R~S/S~T/T~R phase voltage is 380V °æ 10%
R~N/S~N/T~N phase voltage is 220V °æ10%
Check connection condition and wiring if power is abnormal.
T-N
R S
S T S T
R R R S
<Noise Filter Connection Check>
CN-AC-220V CN-AC-220V CN-AC-220V
4. Trouble Shooting
T
N N N
LGE Internal Use Only