LG Multi V 5 - Page 57

112 113
_TROUBLE SHOOTING GUIDE BOOK _
- 129 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. 130% more than outdoor unit rated capacity
2. Wrong connection of communication
cable/piping
3.
Control error of slave outdoor unit Dip switch
4. Power supply defect of slave unit PCB
5. Defect of outdoor unit PCB
Error
No.
Error Type Error Point Main Reasons
Sum of indoor unit capaci-
ty exceed outdoor unit
capacity specification
Over-Capacity
(Sum of indoor unit capaci-
ty is more than outdoor
capacity)
51*
Master
511
n
Error diagnosis and countermeasure flow chart
Is capacity sum of
indoor units less than
130% of outdoor unit
capacity at LGMV?
No
Yes
Check following
dip S/W setting is on
Slave1: No.6
Slave2: No.7
Slave3: No.6,7
No
Adjust corresponding DIP switch
Yes
Is power of Slave PCB
On? (Check LED blinking)
Yes
No
Are quantity and capacity
of indoor units installed
same as the data of LGMV?
Yes
Adjust the capacity of indoor
and outdoor unit
No
Check communication cables
between indoor and outdoor
units
Is main power really supplied?
(Terminal Block T-N)
Yes
No
Supply main
power again
Is communicationmission
cables between outdoor units
connected correctly?*
Check and replace PCB,
Line Fuse, Transformer
No
Re-connect
Yes
Is error code released
in order(Slave2
➠ Slave1 ➠ Main)
after power reset?
No
Replace Main or Slave PCB
Yes
End
* In order to check communication cables between outdoor units,
check in order as below : PCB connectors
➠ terminal block ➠ communication cables
Error No. Error Type Error Point Main Reasons
51*
Over-Capacity
(Sum of indoor
unit capacity is
more than outdoor
capacity)
Sum of indoor unit
capacity exceed
outdoor unit capac
-
ity specification
1. 130% more than outdoor unit rated capacity
2. Wrong connection of communication cable/
piping
3. Control error of slave outdoor unit Dip
switch
4. Power supply defect of slave unit PCB
5. Defect of outdoor unit PCB
- 128 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
50*
Master
501
Slave1
502
Slave2
503
Slave3
504
ODU 3phase power omis-
sion error
Error
No.
Error Type Error Point Main Reasons
Omitting one or more of
R,S,T input power
1. Input Voltage abnormal (R,S,T,N)
2. Check power Line connection condition
3. Main PCB damage
4. Inverter PCB input current sensor fault
n Error Diagnosis and Countermeasure Flow Chart
* Measuring input voltage
* Noise filter wiring
* Field Fault Case
* R-Phase Terminal
Changed Color.
Is input voltage normal?
No
Yes
Recheck power and installation condition
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
Are there any power wire
connections normal?
No
Yes
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
INV. PCB LED display error
No
Replace inverter PCB assembly.
Is Main PCB assembly
normal?
No
1. Check R~N/S~N/T~N phase voltage is
220V±10%
2. Check Main PCB assemblywire
disconnection and wiring
→ Reassemble if abnormality found
Yes
R(L1) S(L2) T(L3) N
Error No. Error Type Error Point Main Reasons
50*
ODU 3phase power
omission error
Omitting one or
more of R,S,T input
power
1. Input Voltage abnormal (R,S,T,N)
2. Check power Line connection condition
3. Main PCB damage
4. Inverter PCB input current sensor fault
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