Hitachi RAS-E10H2 - Power Circuit for Printed Wiring Board

+
I
1
I
2
I
S
I
1
I
2
L1
L2
DB3
C023
Fig. 1-1
Fig. 1-2
Fig. 1-3
MAIN P.W.B.
Input
Voltage
0V
0V
0V
Voltage
Smoothed
Voltage
(3)
C021 and C022
This
smoothes
the
v
oltage
rectified
f
or
oper
ating
the
compressor
.
When
the
input
v
oltage
is
tak
en
f
or
the
sine
wave
a
s
shown
in
the
top
of
Fig.
1-4,
it
is
rectified
by
the
DB2
and
becomes
the
waveform
as
shown
in
the
middle
of
Fig.
1-4.
After
that,
the
v
oltage
is
smoothed
by
the
C021
and
C022,
and
becomes
the
waveform
shown in the bottom of Fig. 1-4.
(4)
DB1 and C41
The
DB1
rectifies
the
input
v
oltage
and
the
C41
smoothes it f
or the control po
we
r supply
.
r supply.r supply
If
the
units
abo
ve
h
av
e
an
y
f
ailure
,
the
control
po
we
r
supply
wo
n’t
operate
.
In
such
a
case
,
replace
the
main
P.W
.B
.
(5)
C001 to C003, C011, L101, and L102
The
y
absorb
electr
ical
noise
gener
ated
dur
ing
operation
of
compressor
,
and
also
absorb
e
xter
nal
noise enter
ing from power line to protect electronic
par
ts
.
Be
sure
to
connect
the
ear
th
cab
le
between
the
indoor
unit
and
the
outdoor
unit.
Otherwise
,
the
noise filter circuit won’t operate prope
rl
y.
(6)
SA1 and
VS1 to
VS3
These surge absorber and
va
r
istors absorb e
xter
nal po
wer surge such as induced thunde
r.
Be
sure
to
connect
the
ear
th
cab
le
between
the
indoor
unit
and
the
outdoor
unit.
Otherwise
,
the
surge absorber and the
va
r
istors won’t operate
.
(7)
R002 and R007
The
resistor
R002
protects
the
r
ush
current
when
the
po
wer
is
tur
ned
on
while
the
resistor
R007
protects the r
ush current when the compressor star
ts
.
When
the
R002
has
an
y
f
ailure
,
the
control
po
w
er
supply
won’t
operate
.
When
the
R007
has
an
y
f
ailure and a strong r
ush current is gener
ated, the DB2, C021 or C022 ma
y be damaged.
ated, the DB2, C021 or C022 may be damaged.ated, the DB2, C021 or C022 ma
Fig. 1-4
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