LG Single "A" - Input Current Control

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Only for training and service purposes

LGE Internal Use Only

Part 3 Control logic

5.1 Function

Controlling total current to protect power semiconductor devices from burn-out by the low current (including connecting

mistake) and over current.

Operating process

1. Detection : check the output DC voltage of Current Transformer(CT).

2. Current Transformer Sensing Error

1) In initial power input, if the CT output is over 4.0V (25A)

it shows Self-Diagnosis Error Mode 40

(defect in CT1 or CT2 detection)

5.2 Operating process

CT 1 detection :

1) If total current exceeds CT1 value, reduce inverter operation by 1 step.

- Step down 10Hz from current step.

- If new Hz is below minimum Hz of operation (cooling & heating), then turn off the compressor.

2) After step down, still if the total current exceed CT1 for more than 5 sec.

then step down inverter operation by 1 more step.

3) If the current continue below CT1 for more than 1 min., return the to setting step Hz.

CT 2 detection :

1) If total current exceeds CT2 turn off compressor.

And after 3 min turn on the compressor and check the current again.

2) If CT2 occurs 5 times in 1 hour,stop the operation and shows Self-Diagnosis Error Mode 22

5. Input Current Control

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