LG LS-J0762NM, Service Manual, Page: 22 / 82

Model
7K Btu Series(AC) 12K Btu Series(AC) 7K Btu Series(DC) 12K Btu Series(DC)
Cooling Heating
5A 6A
8.5A
5.5A 6.5A
8.5A
Cooling Heating
5.5A 7.5A
10A
6A 8A
10A
Cooling Heating
7.5A 5.5A
12A
8A 10A
12A
9K Btu Series(AC)
Cooling Heating
6A 7A
9A
6.5A 7.5A
9A
Cooling Heating
7.5A 9.5A
12A
8A 10A
12A
Operating mode
below 38
°
C
(outdoor temp.)
I1
I2
I1
I2
over 38
°
C
(outdoor temp.)
Condition
15. Power relay control
• Power relay turns on 1 second later after the power is input to the outdoor unit.
• Control sequence : power on
➔
PTC operating
➔
power relay on
16. Protection from total current control
■
CT1 control
• If the operating current reaches I1, the operating frequency of the compressor decrease.
• After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuous-
ly, the operating frequency of compressor increase by 1step.
■
CT2 control
• If the operating current of the appliance reaches I2, the compressor stop instantly and 2 minutes later the
compressor restart again.
• If CT2 occurs 5 times within 1hour, the appliance turn off and display ERROR CODE 7.
-22-
❇
I1:Current of operating frequency down
I2: Current of compressor cut off
cf. I1 is set the lowest level between intial value and in case dectection of dc paeak current.
Control table
17. Protection from DC Peak Current
■
DC Peak Current Error by a fault signal of IPM
• If the operating current of IPM reaches 35A ±3A, the compressor stop instantly.
• If DC PEAK occurs 5 times within 1 hour, the appliance turns off and display ERROR CODE 6.
■
DC Peak Current Error by the compressor lock
• If the DC LINK voltage below DC 140V occurs 5 times within 1 hour while the compressor is operating, the
appliance turns off and display ERROR CODE 6.
■
DC Peak Current Error by the Outdoor Fan Lock
• If it’s 5 times within 1 hour in case of the temperature of outdoor pipe TH is over 65°C while the compressor is
operating, the appliance turns off and display ERROR CODE 6.