Hitachi RAF-25NH5 Instructions De Service page 244

RAM-80QH5
. POWER SUPPLY CIRCUIT
The power supply circuit consists of the circuit (A cycle) corresponds to the indoor units and 2, and the circuit (B cycle)
corresponds to the indoor units 3 and 4.
DIODE STACK A
YEL
POWER SUPPLY
CABLE 230V 50Hz
25A FUSE
SURGE
BLK
L
ABSORBER
VARISTOR 2
WHT
N
GRN 3
L002
GRN
GRN 2
CONTROLP.W.B.
This circuit works as follows and gets DC voltage: at first, all-wave rectifying 230 x 2 = 325[V] from AC 230V supplied L:N
●
terminals, then, boosting proper DC voltage by the chopper circuit.
hile the compressor running, the DC voltage turns out approx. 320V-360V.
But
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REACTOR A
SYSTEM POWER
YEL YEL
MODULE A
L L 2
GRY
SMOOTHING
CAPACITOR
BLU
330µF x 3
RED
CN 4 CN 3
CN 4A (GRY) CN 3A (WHT)
C00 NF COIL
VARISTOR
CT - A
C002
C30 A
L004
CT - B
L006
C30 B
Fig. - Power Supply Circuit
- 274 -
REACTOR B
YEL
L L 2
SMOOTHING
CAPACITOR
330µF x 3
REACTOR C
CN CN 4
CN 4B
CN A (GRY)
(BLU)
C0 0 POWER RELAY A
R002
INRUSH
PROTECTIVE
RELAY A
C0
TO CURRENT DETECTION
CIRCUIT IN CONTROL
VARISTOR 3 P.W.B.
R004
L005
DB
POWER
C0 3
RELAY B
R003 INRUSH
PROTECTIVE
RELAY B
C0 4
TO CURRENT
DETECTION CN
CIRCUIT IN
CONTROL
P.W.B.
SYSTEM POWER
YEL
MODULE B
DIODE STACK B
GRY
BLU
(STRIPED)
RED
CN 3 CN
(STRIPED)
CN 3B CN B
(BLU) (BLU)
TO SWITCHING POWER
SUPPLY FOR CONTROL
CIRCUIT
TO SWITCHING POWER
SUPPLY FOR INDOOR
UNITS ,2,3,4
SW - D - P.W.B.