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25

The LED is lit by setting CPU IC1 pin 63 to LOW output. It is inverted during serial signal reception, and flashes when
an error occurs.

The CPU< operation mode can be divided into the four types shown in the table below. Each mode can be selected by
connecting (a) and (b) in the diagram above to GND.

CPU (IC1) pin 58

R35

R36

R33

5V

R34

CPU (IC1) pin 59

a

b

Electrical burn-in mode

Individual board check mode

Air conditioner 40 Hz fixed mode

Normal operation mode

Yes

Yes

No

No

Yes

No

Yes

No

0 V

0 V

5 V

5 V

0 V

5 V

0 V

5 V

GND connection

CPU input

Operation Mode

a

b

58

59

CPU (IC1) pin 63

R31

LED

5V

26

This filter absorbs the conduction noise and radiation noise transmitted to the power supply by the switching of the
IPM internal IGBT or DC-DC converter.

(2) Surge absorption circuit

This is a protective circuit to eliminate erroneous operation or damage to the air conditioner due to a surge of
lightning.

WPE1 is a protective fuse against the current flowing from the 220/240 V AC power source.

The 220/240 V AC undergoes full-rectification under diode bridge DB1.

This is a capacitor to smooth the voltage rectified by the diode bridge.

(5)  Fuse (WPE2)

A protective fuse on the main circuit in case the IPM or capacitor C3 breaks down. It is a 10 A fuse. If this fuse is
blown, the IPM and capacitor C3 are damaged. Check the control PCB carefully before replacing the fuse.

Capacitor C2 and C3 are for reducing the noise generated by the switching of the 380 V DC voltage.

This resistor is for discharging the charge on electrolytic capacitor C1 when the load side of the 380 V DC voltage
becomes in OPEN state.

The varistor protects the control circuit from a large surge such as lightning. When the surge is large, the varistor is
shorted, and the fuse blows. The varistor will also e broken. When this happens there will be a large crackling noise.
Replace the varistor and fuse.

SA1

WPE1

NR1

1

Terminal
Block

AC 220/240V

C7

C8

C5

C6

R2

L3

L2

AC 220/240V

DB1

27

A/D conversion reference voltage (5V)

Compressor thermistor voltage

—

Heat exchanger pipe thermistor voltage

—

—

AC current induction voltage

Model switch

—

A/D converter circuit GND

CPU reset

Clock

Clock

—

IPM abnormal input

IPM abnormal input

—

—

Serial in

Serial out

Serial out

Outdoor fan control

Outdoor main relay control

—

4-way valve switch relay control

4-way valve power supply relay control

—

—

—

—

—

CPU GND

—

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

VRF

P5.7

P5.6

P5.5

P5.4

P5.3

P5.2

P5.1

P5.0

AGND

RESET

CK1

CK2

TEST1

STP

P4.6

P4.5

P4.4

P4.3

P4.2

P4.1

P4.0

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2

P3.1

P3.0

Ø

GND

TEST2

Input

Input

—

Input

—

—

Input

Input

—

Input

Input

Input

Input

—

Input

Input

—

—

Input

Output

Output

Output

Output

—

Output

Output

—

—

—

—

—

Input

—

Pin

No.

Terminal

name

Input/

Output

Function

28

IPM Z-phase output

IPM W-phase output

IPM Y-phase output

IPM V-phase output

IPM X-phase output

IPM U-phase output

Compressor frequency output

—

—

—

—

—

—

—

Active filter drive control

Active filter error input

—

—

—

—

Winter kit output (option)?

Winter kit input (option)?

—

—

Test mode input

Test mode input

—

—

—

LED drive

CPU power supply (5 V)

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

PWM5

PWM4

PWM3

PWM2

PWM1

PWM0

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P2.0

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2

P1.1

P1.0

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

VDD

Output

Output

Output

Output

Output

Output

Output

—

—

—

—

—

—

—

Output

Input

—

—

—

—

Output

Input

—

—

Input

Input

—

—

—

Output

Input

Pin

No.

Terminal

name

Input/

Output

Function