LG multi V PLUS, Service Manual

Page: 218 / 373

218 Outdoor Unit
Function
(4) DC peak control
1. Criterion for DC peak : if the fault signal from IPM (Intelligent Power Module) is occurred continuously
for 1.8ms, then it is judged that DC peak occurred.
2. After inverter compressor turned off, 3minutes later if there is no DC peak signal, then restart compres-
sor.
(5) CT(current transformer) sensor fault error
Detection for CT sensor fault
Criterion for CT sensor fault(which is judged from operation current for each frequency)
(6) Over upper limit voltage and below lowest limit voltage
If the voltage of system input power exceed the upper limit(415V) of rating voltage(380 ~ 415V) by 15%
over(478V or more) or is below the lowest limit(380V) of rating voltage by 20%(304V or less) then the
compressor is turned off, and restart 3 minutes later.
(7) Controls for error occurrence
1. DC peak error
- Restart 3 minutes later.
- System down if the error occurs 3 or more times in an hour
2. CT sensor error
- Restart 3 minutes later.
- System down if the error occurs 3 or more times in an hour- Counter reset if the error
3. Sensor error
- During the error signal is on, the compressor can not be turned on
4. Transmission error
- If the transmission with all of indoor unit is ceased, then compressor is turned off
- If the transmission between inverter PC board and control PC board in outdoor unit, then all of the
compressor is turned off.
After Inverter Compressor Off
CT value
CT < 1.5A for 10 seconds