Hitachi RAS-E10H2 - Reset Circuit Details

DC voltage : Low
DC current
 : High
DC voltage
 : High
DC current
 : Low
DC voltage
 : 260V
Rotation speed
DC current
0
0
IPM
DC current
P
DC
Voltage
N
Detection
resistor
U
+
V
+
W
+
U V W
U
V
W
Compressor motor
Fig. 6-8
Fig. 6-9
6-3.
Reset Circuit
The reset circuit initializ
es the microcomputer prog
ra
m when
Po
wer is
“ON”
from
“ON” from “ON”
“OFF”.
Lo
w v
oltage at pin
7
resets the microcomputer, and HI activates the microcomputer.
Fig. 6-10 shows the reset circuit and Fig. 6-11 sh
ow
s
wavefo
rm
at each point when power is turned on and
and off.
When
po
wer
is
tur
ned
on,
12V
line
and
5V
line
v
oltages
r
ise
and
12V
line
v
oltage
reaches
10.9V
an
reset v
oltage input to pin
7
of microcomputer is set to Hi
.
Reset
v
oltage
will
be
hold
“Hi”
until
the
12V
line
v
oltage
drops
to
9.90V
ev
en
though
the
po
w
er
shuts
do
wn
.
Fig. 6-10
Fig. 6-11
−
HIC
Microcomputer
RESET OUT.
RESET
19
7
C204
0V
R252
1
0V
8
2
3
IC5(1/2)
+
5V
D208
R287
C215
R284
R286
C225
R285
C226
R292
R289
R288
0V 0V 0V 0V
12V
12V line
12V line
5V line
5V line
Reset volage
Reset volage
Time
Time
10.9V
9.9V
12
6
0
12
6
0
Power is ON Voltage (V)
Power is OFF Voltage (V)
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