Power Relay Control; Protection From Total Current Control - LG LS-J0762YL Service Manual

15. Power relay control

• Power relay turns on 1 second later after the power is input to the outdoor unit.
• Control sequence : power 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.
Control table
Condition
Operating mode
below 38°C
(outdoor temp.)
over 38°C
(outdoor temp.)
cf. I1 is set the lowest level between intial value and in case dectection of dc paeak current.
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.
PTC operating
I1:Current of operating frequency down
I2: Current of compressor cut off
Model
7K Btu Series(AC) 12K Btu Series(AC) 7K Btu Series(DC) 12K Btu Series(DC)
Cooling Heating
I1
5A
I2
8.5A
I1
5.5A 6.5A
I2
8.5A
power relay on
Cooling Heating
6A 7.5A 5.5A
12A
8A 10A
12A
-22-
Cooling Heating Cooling
5.5A 7.5A 7.5A
10A
6A 8A 8A
10A
Heating
9.5A
12A
10A
12A