LG ABNH186HLAB, Service Manual

Page: 149 / 183

Service Manual 149
Outdoor Units
3.3 Inverter Protection control(2)
3.3.1 Function
: Power module failure protection by checking the temperature of heat sink.
There is a temperature sensor for checking the heat sink temperature.
3.3.2 Heat sink sensor failure error
Short Check : if temperature
≥
130°C
Open Check : if temperature < - 30°C
System will go in self diagnosis (error 65) is displayed and product stops.
3.3.3 Heat sink temperature control
a) Heat sink temperature < T2 : No limitation on compressor frequency
b) T2
≤
heat sink temperature < Toff : Compressor frequency down by 5 Hz
c) Heat sink temperature
≥
Toff : Compressor will be off.
System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will
start.
If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation
occurs system stops and give error code.
If the temperature reached Toff condition system will count 5 times after that and system will stop with error
code.
COMP
Hz
Toff=85
°
C
T2=75
°
C
OFF
Set
frequency
Set
frequency
Set
frequency
Heat Sink temp
5 Hz
Down
5 Hz
Down
T1=70
°
C