LG ARTCOOL Series Service Manual page 22

5.8 Overheating Protection (Power Module)
• If the temperature of the heat sink thermistor. reaches over Toff, the Compressor stop instantly.
• The compressor operating frequency is limited according to the heat sink thermistor. (refer to below FIG.)
• It will blink 4 times, when the thermistor is open or short, also when the temperature is over T off.
NOTE: Some Models are different by Ton, and Toff.
5.9 Total Current Control (Over Current Protection)
5.9.1 CT1 control
• If the operating current reaches I1, the operating frequency of the compressor decreases.
• After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuously, the
operating frequency of compressor increases by 1step.
5.9.2 CT2 control
• If the operating current of the appliance reaches I2, the compressor stop instantly and two minutes later the compres-
sor restarts again.
• If CT2 occurs 5 times within one hour, the appliance turn off and displays ERROR CODE 7.
- I1 :Current of operating frequency down(5.5A ~ 12.0A)
- I2 : Current of compressor cut off(9.0A ~ 14.0A)
* ( I1, I2 depends on model )
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
∆T = (T off - T on)
T1 = T on + ∆T
T2 = T on + 2 * ∆T
T off °C
T2 °C
T1 °C
T on °C
COMP
Free Fc-1 Fc-2
Freq.
T on : 85°C (Model by Model)
T off : 95 ~ 105°C (Model by Model)
Heat Sink Temp.
Fc-1 Fc-2 OFF
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Part 2 Functions & Controls
Free
LGE Internal Use Only