Hitachi RAM-130QH5, Service Manual, Page: 52 / 84

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SMOOTHING
CAPACITOR
SPM (SYSTEM
POWER MODULE)
DIODE STACK
SERVICE SWITCH
2P TERMINAL BOARD
REACTOR
CONTROL P.W.B
SELF-DIAGNOSIS LAMPS
SWITCHING
POWER P.W.B
OUTDOOR
UNIT 1
SMOOTHING
CAPACITOR
SPM (SYSTEM
POWER MODULE)
DIODE STACK
SERVICE SWITCH
2P TERMINAL BOARD
REACTOR
CONTROL P.W.B
SELF-DIAGNOSIS LAMPS
SWITCHING
POWER P.W.B
OUTDOOR
UNIT 2
LD301 LD302 LD303 LD304
LD301 LD302 LD303 LD304
ÇO?E?E?E?E?EÇ`
ÇO?E?E?E?E?EÇ`
ÇPÇR
ÇPÇS
ÇPÇS
ÇPÇR
A B
S
S
+
U
U
V
W
–
U
+
V
–
V
+
W
–
W
_
+
System Power Module
320-360V
R24
DC current (Id)
detection resistor
A
U coil
DC compressor
motor
V coil
W coil
B
Fig. 3-4 System Power module circuit (U+ is OFF, V– is ON)
Fig. 3-5