LG ACHH Series Manual page 65

Error
Error Type
No.
Inverter compressor DC
23
Link high voltage/ low volt-
(231)
age
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Is input voltage normal?
Is bridge diode connection normal?
Is inverter PCB assembly power
connection normal?
Is inverter PCB assembly
Recheck power and installation condition
* Check DC_Link Connector joining condition
Error Point
Input voltage is over limited
value of the product (300 V
or less, 780 V or more)
No
Yes
No
Yes
No
Yes
No
Yes
No
normal?
Yes
• DC Link Connector
1. DC Link terminal misconnection/terminal
contact fault
2. Starting relay damage
3. Condenser damage
4. Inverter PCB assembly damage
(DC Link voltage sensing part)
5. Input voltage low
1. Check R/S/T wiring conditions
→ Rewire them if abnormality found.
Check R~S/S~T/T~R phase voltage 380-415 V ± 10 %,
R~N/S~N/T~N phase voltage 220 ± 10%
→ Check connection condition and wiring if power is
abnormal
1.Check bridge diode connection condition
2.Check wire disconnection and wiring
→ Reassemble if abnormally found
Check connection between inverter PCB assembly and
bridge diode(misconnection, disconnection)
→ wiring again if abnormality found
Check inverter PCB assembly IPM normality.
→ Replace inverter PCB assembly if abnormality found.
* Measuring input voltage
R(L1) S(L2)
- 65 -
Error code check
Main Reasons
T(L3) N