LG Multi V 5 - Page 52

102 103
_TROUBLE SHOOTING GUIDE BOOK _
- 119 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
29*
Master
291
Slave1
292
Slave2
293
Slave3
294
Inverter compressor over
current
Error
No.
Error Type Error Point Main Reasons
Inverter compressor input
current is over 30A
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref.
overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. ODU Inverter PCB assembly damage
n Error Diagnosis and Countermeasure Flow Chart
Is installation
condition normal?
No
Yes
Recheck power and installation condition
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
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
1.Check resistance between each terminal of compressor
2.Check insulation resistance between compressor terminal
and pipe (over 50M )
→ Replace compressor if abnormality found
Is compressor
Wire connection
condition normal?
No
Yes
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
Is input voltage normal?
No
Yes
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
Is Inverter PCB assembly normal?
No
Check Inverter PCB assembly IPM normality
→ Replace Inverter PCB assembly
Yes
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
Error No. Error Type Error Point Main Reasons
29*
Inverter compressor
over current
Inverter compressor in
-
put current is over 30A
1. Overload operation
(Pipe clogging/Covering/EEV defect/
Ref.overcharge)
2. Compressor damage(Insulation
damage/Motor damage)
3. Input voltage low
4. ODU Inverter PCB assembly damage
- 118 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
28*
Master
281
Slave1
282
Slave2
283
Slave3
284
Inverter DC link high
voltage error
Error
No.
Error Type Error Point Main Reasons
Inv PCB DC link voltage
supplied over 780V
1. Input voltage abnormal (R,S,T,N)
2. ODU Comp PCB damage
(DC Link voltage sensing part)
n
Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
No
Yes
Recheck power and installation condition
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
Is Inverter PCB assembly
normal?
No
Yes
Replace Inverter PCB assembly
1. Check R/S/T/N wiring conditions
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
No
Yes
* Measuring input voltage
* Noise filter wiring
Are there any power wire
connections normal?
R(L1) S(L2) T(L3) N
Error No. Error Type Error Point Main Reasons
28*
Inverter DC link high
voltage error
Inv PCB DC link voltage
supplied over 780V
1. Input voltage abnormal (R,S,T,N)
2. ODU Comp PCB damage
(DC Link voltage sensing part)
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