LG MULTI V 5 Manual Book page 52

Error
Error Type Error Point
No.
28*
Master
281
Error No. Error Type Error Point
Slave1
282
Inverter DC link high Inv PCB DC link voltage
voltage error
Slave2 supplied over 780V
Inverter DC link high Inv PCB DC link voltage
28*
283
voltage error supplied over 780V
Slave3
284
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire No
connections normal?
Yes
No
Is input voltage normal?
Yes
No
Is Inverter PCB assembly
normal?
Yes
Recheck power and installation condition
* Measuring input voltage
* Noise filter wiring
R(L1) S(L2) T(L3) N
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
102
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Input voltage abnormal (R,S,T,N)
2. ODU Comp PCB damage 1. Input voltage abnormal (R,S,T,N)
(DC Link voltage sensing part)
2. ODU Comp PCB damage
(DC Link voltage sensing part)
1. Check R/S/T/N wiring conditions
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V 10%
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
Replace Inverter PCB assembly
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LGE Internal Use Only
Error
Error Type Error Point
No.
Error No. Error Type Error Point
29*
Master
291
Slave1
Inverter compressor over Inverter compressor input
Inverter compressor Inverter compressor in-
292
29*
current current is over 30A
over current put current is over 30A
Slave2
293
Slave3
294
n Error Diagnosis and Countermeasure Flow Chart
Is installation No
condition normal?
Yes
Are the resistance
No
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
No
Wire connection
condition normal?
Yes
No
Is input voltage normal?
Yes
No
Is Inverter PCB assembly normal?
Yes
Recheck power and installation condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
Main Reasons
1. Overload operation
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref. (Pipe clogging/Covering/EEV defect/
overcharge)
Ref.overcharge)
2. Compressor damage(Insulation
2. Compressor damage(Insulation
damage/Motor damage)
damage/Motor damage)
3. Input voltage low
3. Input voltage low
4. ODU Inverter PCB assembly damage
4. ODU Inverter PCB assembly damage
1. Check Pipe clogging/distortion
2. Check Covering (Indoor/Outdoor Unit)
3. Check EEV connector assemble condition/normal
operation
4. Check refrigerant pressure
→ Reassemble or manage if abnormality found
1.Check resistance between each terminal of compressor
Compressor JQC068MA* JQC048MA*
Temp. 25℃ 75℃ 25℃ 75℃
U-V 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
V-W 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
W-U 0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
2.Check insulation resistance between compressor terminal
and pipe (over 50M )
→ Replace compressor if abnormality found
1. Check Inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
Check
R~S/S~T/T~R phase voltage is 380V ±10%
R~N/S~N/T~N phase voltage is 220V ±10%
→ Check connection condition and wiring if power is
abnormal
Check Inverter PCB assembly IPM normality
→ Replace Inverter PCB assembly
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LGE Internal Use Only
103
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