LG Multi V 5 - Page 49

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_TROUBLE SHOOTING GUIDE BOOK _
- 113 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
* Check DC_Link Connector joining condition
• DC Link Connector
* Measuring input voltage
R(L1) S(L2) T(L3) N
IPM
- 112 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
23*
Master
231
Slave1
232
Slave2
233
Slave3
234
Inverter Compressor DC
Link Low Voltage
Error
No.
Error Type Error Point Main Reasons
DC Voltage isn't charged
after starting relay on
1. DC Link terminal misconnection/terminal
contact fault
2. Condenser damage
3. Comp PCB assembly damage
(DC Link voltage sensing part)
4. Input voltage low
n
Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
No
Yes
Recheck power and installation condition
Yes
Check
R~S/S~T/T~R phase voltage is 380 V(-10 %)~415 V(+10 %)
R~N/S~N/T~N phase voltage is 220 V(-10 %)~240 V(+10 %)
→ Check connection condition and wiring if power is
abnormal
Are there any power wire
connections normal?
No
Yes
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Is Inverter PCB assembly
normal?
No
Check Inverter PCB assembly IPM normality.
→ Replace Inverter PCB assembly if abnormality found.
Is bridge diode normal?
No
1. Check joining condition of bridge diode and heatsink
2. Check bridge diode
→ joining again or replacing bridge diode
if abnormality found
Yes
Yes
Is Inverter PCB assembly
bridge diode joining condition normal?
No
Check joining condition of Inverter PCB assembly and
bridge diode
→ joining again if abnormality found
Yes
Is DC_Link Wire connection
condition normal?
No
1.Check Inverter PCB assembly P,N connector
connection condition
2. Check wire disconnection and wiring
→ Reassemble if abnormality found
Error No. Error Type Error Point Main Reasons
23*
Inverter PCB DC Link
Low Voltage
DC Voltage isn't charged
after starting relay on
1. DC Link terminal misconnection/ter
-
minal contact fault
2. Condenser damage
3. PCB assembly damage
(DC Link voltage sensing part)
4. Input voltage low
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
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