Outdoor Unit - LG LS-J0761NL Service Manual

Outdoor Unit

Power relay control
• If power is on, it will operate to chage capacitor (330µF/450WV) on controller and power relay will oper-
ate after about 2~5sec.
Stand by control at low temp.
• If outdoor temp. is below 0°C, preheater is operating for 1~5min.
• At the initial, It will be operated compressor after 1min. for preheating.
Active power filter control(PFC)
• The active power filter is designed to correct power factor(cos ) and to regulate DC link voltage.
• It will be operated PFC circuit when the compressor freq. is over 12Hz.
• If DC link voltage is not over DC 350V in 6 sec. in case of PFC on, it does not operating of compressor.
Comp. Freq. control
• The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp.,
heat-sink temp., target freq., owing to CT.
Overheatng. Protection(Power module)
• When the temp. of power module increases to 85°C, controller decreases Freq. of Comp.
Freq. speed control(up/down speed)
• It will be changed the drive freq. of comp. according to temp. of indoor and outdoor.
V/F control
• It will be changed the drive voltage of comp. according to operating frequency.
Total current control (over current protection)
DC peak current control
4 way valve control
• It is only operated in the heating operation mode except defrosting operation.
Outdoor fan motor control
• High speed
- Although fan motor speed is low, it will change high speed in case of below AC193V, over 45°C of out-
door temp., and over fc, fh of comp. Freq.
• Low speed
- Nomal mode and over AC270V
Discharge pipe temp. control
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