Table of Contents
Part 3 Basic Control
1. Normal operation
Basic principle is to control the rpm of the motor by changing the working frequency of the compressor.
Three phase voltage is supplied to the motor and the time for which the voltage will supplied is controlled by IPM
(intelligent power module).
Switching speed of IPM defines the variable frequency input to the motor.
Actuator
Compressor
Fan
EEV
2. Compressor control
Fuzzy control : Maintain evaporating temperature (Te) to be constant on cooling mode by fuzzy control to ensure the
stable system performance.
3. EEV( Electronic Expansion Valve) control
EEV operates with fuzzy control rules to keep The degree of superheat (2~3℃) or the target temperature of discharge pipe.
＊Cooling mode
The degree of superheat = Tsuction – Tevaporator
Tsuction : temperature at suction pipe sensor(℃)
Tevaporator : evaporation temperature (℃)
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Cooling operation
Fuzzy control
Fuzzy control
Super heating
fuzzy control
Linear control
Cooling load
Inverter linear control as cooling load increasing
- 37 -
Stop state
Stop
Stop
Min. Pulse
LGE Internal Use Only
Hide quick links:
Chapters
Table of Contents
Troubleshooting
