Hitachi RAS-80YH5A Service Manual page 57

1. Power Circuit
Power P.W.B.
TERMINAL
BOARD
25A FUSE
NF COIL1
L
BLK
SURGE
ABSORBER
a R001
WHT
N
L007 CT1
GRN1
0V
C103
C017
R009
GRN2
JW5
L006
GRN3
This circuit full-wave rectifies 220-240V AC applied between terminals L and N, and boosts it to a required
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voltage with the active module, to create a DC voltage.
The voltage becomes 260-360V when the compressor is operated
(1) Active module
The active filter, consisting of a reactor and
switching element, eliminates higher
harmonic components contained in the
current generated when the compressor is
operated, and improves the power-factor.
(2) Diode stacks
These rectify the 220-240V AC from
terminals L and N to a DC power supply.
POWER RELAY
COIL
R002 R003 INRUSH CURRENT RELAY
JW3
VARISTOR2
DS
L005
C014
C013
REACTOR
L1 L2
SPM2
DIODE
STACK 1 TB7 TB6
TB8
(D25VB60)
b
TB2
Fig. 1-1
< Reference >
In case of malfunction or defective connection:
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Immediately after the compressor starts, it may stop
due to "abnormally low speed" active error, etc.
The compressor may continue to operate normally,
but the power-factor will decrease, the operation
current will increase, and the overcurrent breaker
of the household power board will probably activate.
In case of active module faulty or defective
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connection:
Although the compressor continues to operate
normally, the power-factor will decrease, the
operation current will increase, and the overcurrent
breaker of the household power board will probably
activate.
< Reference >
If diode stack 1 is faulty, the compressor may stop
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due to "lp", "anbormally low speed", etc. immediately
after it starts, or it may not operate at all because
no DC voltage is generated between the positive e
and negative d terminals.
If diode stack 1 is faulty, be aware that the 25A
fuse might also have blown.
If diode stack 2 is faulty, DC voltage may not be
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generated and the compressor may not operate at
all. Also, be aware that the 5A fuse might have
blown.
– 66 –
Vd
N1
P1
TB10
U
TB11
V
TB12
W