Hitachi RAS-07G4 - Page 48

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7. Auto Sweep Motor Circuit
Micro computer
(AX-3U)
48
49
50
51
1
2
3
4
8
16
IC501
12V
CN12
Auto sweep motor for
horizontal air deflectors
Rotor
0V
15
14
13
1
2
3
4
5
Fig. 7-1 Auto Sweep Motor Circuit (Horizontal air deflectors)
● Fig. 7-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 7-2 are output from pins
k – A of the micro computer.
Micro computer pins
Step width
Horizontal air
deflectors: 10ms.
12345678
Horizontal air deflectors
51
50
49
48
Fig. 7-2 Micro computer Output Signals
● As the micro computer’s outputs change as shown in Fig. 7-2, the core of the auto sweep motor is excited
to turn the rotor. Table 7-1 shows the rotation angle of horizontal air deflectors.
Rotation angle per step (° )
0.0879
Time per step (ms)
10Horizontal air deflectors
Table 7-1 Auto sweep Motor Rotation