Hitachi RAM-68NP3B, Service Manual, Page: 47 / 79

Fig. 2-1
L
BLK
F1
BLK
2P-Terminal
SK1
RL4
REVERSING VALVE RELAY
POWER FOR
MAIN
CIRCUIT
CN2
（RED）
VH2P
GN1
GN2
REVERSING
VALVE COIL
WHT
SA
SURGE ABSORBER
L001
C001
C002
C007
C008
C003 C006
C014 C013
L002
C012
VS1
VS2
L004L006
R007 RY2
Inrush
prevention
relay
RY1
POWER RELAY
5.3mH
R008
DB601 DB602 D601 L005
C020 C019
C011
C021
R009 R010
R742
F4
C751
R601
Q601Q602
R741
C032
0V
0V
CT1
F3
U
V
W
U
V
W
U
V
W
Compressor
motor
IPM
N
23
22
21
20
24
C604
MAIN PWB
4
3
2
1
Reference:
○
If there is a failure in the diode bridge (DB601, DB602),
DC voltage is not generated and operation might not
occur.
Reference:
○
In case of IPM failure or poor connection,
immediately after starting the compressor, it might
stop due to abnormal speed reduction, switching
failure, Ip cut, etc.
⑵
Diode bridge (DB601, DB602)
Rectifies AC220-240V from terminal blocks
L and N to a DC power supply.
⑴
Intelligent Power Module (IPM)
used for configuration of inverter section.
●
Primary Components
●
This circuit rectifies the AC220-240V between L and N on the 2P terminal block, and creates a DC voltage.
During operation of the compressor, the rectified circuit voltage is approximately (DC320V - 360V).
2. Converter Circuit
INVERTER PWB
Reactor
Fan motor
VS9
C022
Q716 Q715 Q714
Q713 Q712 Q711