Hitachi RAS-18SX8 Manuel De Maintenance page 143
11. Cleaner drive circuit
・
The cleaning wiper scrapes out any dirt and dust from the filter mounted at the suction inlet up to the dust catcher, thereby
cleaning the filter.
・
The cleaner is activated only when being initialized at power-on and in either of the operation modes: "manual cleaning,"
"automatic cleaning," and "forcible cleaning."
In either of the above operation modes, control of the microcomputer (IC601) will turn on the Q902, with the 12 V component
passing the driver IC (IC911) and powering the cleaning drive motor.
・
The cleaning motor will, by using the driver IC (IC911), perform micro-step sine wave drive (excitation of W1-2). When moving
from the right to the left, the motor current will show a waveform as illustrated in the chart below.
The waveform may change slightly according to the rotation speed.
・
The cleaning wiper moves rightward as the indoor unit is viewed from the front. Pressing the cleaning position detection
switch will return the product to its initial position. (If it is already in its initial position, it will remain there.)
The wiper will start at its initial position and move leftward. It passes by the dust catcher and, as it reaches the left end, the
cleaning drive motor will reverse and change its direction rightwards.
When the cleaning wiper presses the cleaner position detection switch mounted at the right end of the indoor unit, the
cleaning operation will be complete.
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R906
Q902
12V
Microcomputer
IC601
IC682
Ventilator power
62
6
11
(Lo, OFF; Hi, ON)
30
Clock signal
STBY signal
34
Excitation mode
32
setting
Forward/reverse
31
signal
33
Reset signal
Vref setting
29
0V
5V
D911
R914
Cleaning Id
93
C912
0V
Cleaning limit switch, right
(Lo, OFF; Hi, ON)
(%)
100
80
60
40
20
0
-20
0
0
10
10
-40
-60
-80
-100
manuals search engine
R911
IC911
19
16
5
1
6
20
13
10
2
12
4
7
11
8
14
17
9
3
15
18
C914
C911
R915
R917
6
-
7
+
5
R916
R918
IC931
(2/2)
C913
D912
Cleaner position detection switch, right
R919
5V
0V
0V
0V
1
6
2
R616
R711
R713
C614
0V
0V
Fig. 11-1
20
20
30
30
40
40
– 176 –
5V
Red
Ｐ Ａ− ４ Ｐ − （ vertical ）
CN8
1
2
M
R912
3
Cleaning motor
4
R913
Black
CN10
Ｐ Ａ− ２ Ｐ − （ vertical ）
Phase A
Phase B
50
50
