Hitachi RAM-50CNHZ2, Руководство по обслуживанию, Страница: 68 / 107

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3. System Power Module Circuit
●
Fig. 3-1 shows the system power module and its peripheral circuit. (Current ACT module and power module are combined into one u
nit.)
The three transistors on the positive
e
side are called the upper arm, and the three transistors on the negative
d
side, the lower arm.
+
W
U V W
W
–
+
V
V
–
+
U
U
–
A
+
–
DC Compressor motor
U coil
V coil
W coil
System P
o
w
e
r module 2
+
–
+
–
+
–
R24
A
CT MODULE
0.35
m
H
P
o
w
e
r rela
y
Coil
R002
R003
Inr
ush current
protection rela
y
C006
R004
Noise filter coil
L N
T
e
rm
inal
board
FUSE (25A)
INVER
TER
Fig. 3-1 System power module circuit (U
+
is ON, V
–
is ON)