Power Supply Circuit - Hitachi RAF-35NH5 Service Manual

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
POWER SUPPLY
CABLE 230V 50Hz
SURGE
BLK
L ABSORBER
VARISTOR 2
WHT
N
GRN 3
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
REACTOR A
YEL
L L 2
GRY
BLU
YEL
RED
CN 4
CN 4A (GRY) CN 3A (WHT)
25A FUSE C00 NF COIL
VARISTOR
C002
L002
L004
L006
SYSTEM POWER
YEL
MODULE A
SMOOTHING
CAPACITOR
330µF x 3
REACTOR C
CN 3 CN
CN A (GRY)
C0 0
POWER RELAY A
R002
INRUSH
PROTECTIVE
RELAY A
CT - A
C0
C30 A
VARISTOR 3
R004
L005
DB
C0 3
CT - B
C0 4
TO CURRENT
DETECTION
CIRCUIT IN
CONTROL
C30 B
P.W.B.
Fig. - Power Supply Circuit
- 274 -
REACTOR B
SYSTEM POWER
YEL YEL
MODULE B
L L 2
SMOOTHING
CAPACITOR
330µF x 3
CN 4 CN 3 CN
CN 4B CN 3B
(BLU) (BLU)
TO CURRENT DETECTION
CIRCUIT IN CONTROL
P.W.B.
TO SWITCHING POWER
SUPPLY FOR CONTROL
CIRCUIT
POWER
RELAY B
R003 INRUSH
PROTECTIVE
RELAY B
CN
TO SWITCHING POWER
SUPPLY FOR INDOOR
UNITS ,2,3,4
DIODE STACK B
GRY
BLU
(STRIPED)
RED
(STRIPED)
CN B
(BLU)
SW - D - P.W.B.