Hitachi RAS-25SX8 - Power Circuit

L003
GN2
GN1
SA
(103)
L002
CT
C803
L001
R002
C802
R804
C804
0V
C012
F1
C011
C003
F3
C005
12V
L801
0V
C014 C002
C007
WJ2
C004
C013 C001
NF1
C006
WJ1
+
R02
DB602
DB601
TAB2
L1
+
C021
C103 C101
R01
J9
N
C022
F4
IPM1
P
Cr
L2
W
U
V
CONTROLP. W . B .
TERMINAL
BOARD
TAB3-4
A
B
C
CN2
R441
4
1
3
2
DB1
RL1
RL2
VH-4P-Top
REVERSINGVALVE
COOL/HEAT
CHANGINGRELAY
REVERSING
VALVERELAY
R08
SURGEABSORBER
VARISTORVS2
VARISTOR
VS1
1. Power Circuit
MODEL RAC-25SX8, RAC-35SX8
Fig. 1-1
○
This circuit produces a DC voltage by changing the AC current of 220 V to 230 V between terminal boards A and
B to full-wave rectification and double-voltage rectification by using a diode stack (DB601) and full-wave/double-
voltage relay.
Provided that it enters the range of between about 320 V and 360 V while the compressor is running.
<Reference>
○
When the intelligent power module fails or becomes
poorly connected
It may stop immediately after compressor startup, due
to "abnormally low speed," "unsuccessful failure," "Ip
stoppage," or something similar.
<Reference>
○
When the diode stack (DB602) fails, it may be because
there is no DC voltage, resulting in its total operation
stoppage. Note also another possibility where the 25
A fuse (F1) may have melted down.
○
If the diode stack (DB601) is in a failure, an "abnormal
power supply voltage" may occur.
○
Main components
(1) Intelligent power module (IPM)
The module constitutes the inverter.
(2) Diode stack (DB1, DB601, DB602)
This rectifies the current 220 to 230 V AC applied
between terminal boards A and B to a DC current.
– 180 –
VARISTORVS4