Hitachi RAS-25CNH2 - Auto Sweep Motor Circuit

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4. Auto Sweep Motor Circuit
Micro computer
48
49
50
51
4
3
2
1
8
13
IC501
12V
CN4
Auto sweep motor for
horizontal air deflectors
Rotor
0V
14
15
16
Fig. 4-1 Auto Sweep Motor Circuit (Horizontal air deflectors)
● Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 4-2 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. 4-2 Micro computer Output Signals
● As the micro computer’s outputs change as shown in Fig. 4-2, the core of the auto sweep motor is excited
to turn the rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.
Rotation angle per step (° )
0.0879
Time per step (ms)
10Horizontal air deflectors
Table 4-1 Auto sweep Motor Rotation