Hitachi RAS-E10H2 Service Manual page 52

6. Peripheral circuits of microcomputer
Fig. 6-1 shows the microcomputer and its peripheral circuits, Table 6-1 shows the basic operation of
each circuit block, and Fig. 6-2 shows the system configuration.
Ｃ Ｔ １ Ｃ
０ Ｖ
Ｃ ０ ０ ９
０ Ｖ
Table 6-1
Circuit block
Peak current cutoff circuit
Overload control circuit
Reset circuit
Detection resistor
Ｒ ０ ０ １
DC current
２ ２ ９ ９
＋
Ｄ ０ ０ １ Ｒ ０ ０ ５
０ Ｖ
０ Ｖ
Fig. 6-1 Peripheral circuits of microcomputer
Detects DC current flowing into power module and, when over-current
(instantaneous value) flows, stops lower arm drive circuit and creates
Ip signal to stop microcomputer at the same time.
Protects compressor by judging overload status based on input current,
DC current and DC voltage.
Creates reset voltage.
IPM (Intelligent Power Module)
３ ３ ５ ５ ５ ２ ２ ６ ６ ２ ２ ４ ４ ４
N
１ １ ２ ２
Ｒ ９ ０ ６
０ Ｖ
０ Ｖ
６
− ７
Ｒ ２ ４ ５
５
＋
４ ４ ４ ４ ７ ７ ７
＋
Ｉ
Ｃ ４
５ Ｖ
０ Ｖ ０ Ｖ
Ｒ ２ ２ ２
０ Ｖ
D２ ０ ８
Ｒ ２ ８ ７
１ ２ Ｖ
５ Ｖ
２
０ Ｖ
−
１
３
＋
Ｉ
Ｃ ５
Ｒ ２ ８ ８
０ Ｖ０ Ｖ ０ Ｖ
Basic operation
- 56 -
DC voltage
approx. DC 235 V
P P
Ｒ ０ ０ ３
Ｒ ０ ０ ４
５
I
H C
Ｒ ６ １ ３
Microcomputer
Ｒ ６ １ ２
６ ６ ２ Ｖ ｄ
５ Ｖ
０ Ｖ ０ Ｖ
１ ５
Ｉ
Ｐ
５ Ｖ
０ Ｖ
Ｒ ２ ４ ８
６ １ Ｉ
ｄ
０ Ｖ
６ ０ ０ Ｉ
Ｓ
０ Ｖ
STANDBY output
１ ９
７
RESET
Ｒ ２ ５ ２
０ Ｖ