Description Of Main Circuit Operation; Power Circuit; System Power Module; Active Module - Hitachi RAM-55QH5 Service Manual

DESCRIPTION OF MAIN CIRCUIT OPERATION

MODEL RAM-55QH5, RAM-65QH5
1.

Power Circuit

POWER P.W.B.(1/2)
25A FUSE
BLK
L
VARISTOR 1
SURGE
ABSORBER
R001
WHT
N
L007
C71
GRN1
0V
C103
0V
GRN2
JW5
GRN3
SWITCHING POWER SUPPLY 2
This circuit full-wave rectifies 220-240 AC applied between terminals L and N, and boosts it to a required
voltage with the active module, to create a DC voltage.
These rectify the 220-240V AC from
terminals L and N to a DC power supply.
COIL
NF COIL
R009
L006
DIODE STACK
R005
SPM2
POWER RELAY
YEL
TB8
GRY
R002 R003
ICP RELAY
JW3
TB2
BLU
RED
Fig. 1-1
– 75 –
REACTOR
YEL YEL
L1 L2
TB7 TB6
TB11
TB11
TB11