LG ACHH Series Manual page 77

Error
Error Type
No.
ODU 3phase power omis-
50
sion error
(501)
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is inverter PCB assembly
normal?
Yes
Recheck power and installation condition
* Measuring input voltage
R(L1) S(L2) T(L3) N
Error Point
Omitting one or more of
R,S,T input power
No
1. Check (R,S,T,N) wiring conditions
→ Rewire them if abnormality found.
1. Check resistance between each terminal of compressor
(0.172~0.173 Ω ± 7 %)
2. Check insulation resistance between compressor
No
terminal and pipe (over 50 M)
→ Replace compressor if abnormality found
1.Check inverter PCB assembly U,V,W connector
connection condition
No
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
No Check inverter PCB assembly IPM normality.
→ Replace inverter PCB assembly if abnormality found.
* Noise filter wiring
- 77 -
Main Reasons
1. Input Voltage abnormal (R,S,T,N)
2. Check power Line connection condition
3. CYCLE Main PCB damage
4. Inverter PCB input current sensor fault
*Field Fault Case
Error code check
* R-Phase Terminal
Changed Color.