LG Multi-Inverter Service Manual page 117

4. Trouble Shooting
Display
Title
code
C/T
40
Sensor Error
I Error Diagnosis and Countermeasure Flow Chart
Is CT Sensor Output is right?
Yes
Is input voltage normal?
Yes
Recheck the Inverter PCB and
installation condition
<INVERTER PCB>
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Only for training and service purposes
Cause of error
• Initial current error
No
If the CT Sensor output is not 2.5Vdc°æ5%
Replace the Inverter PCB
Check the input voltage source
No
(Is nomal the offset of R-N,T-N voltage)
Tester
- 116 -
Check point & Normal condition
• Malfunction of current detection circuit.
(Open / Short)
• The voltage of "C01N" Is 4.0Vdc(25A) .
• Check CT Sensor output voltage : 2.5Vdc
±5%
CT Sensor Output
(at the INVERTER PCB)
GND GND GND
COMP CURRENT COMP CURRENT COMP CURRENT
U,V,W U,V,W U,V ,W
INPUT INPUT INPUT
VOLTAGE INV VOLTAGE INV VOL
<INPUT VOLTAGE Check Point>
AGE INV
LGE Internal Use Only