Hitachi RAF-50FX8 Service Manual page 86

MODEL RAC-50FX8
1. Power Circuit
TERMINAL
MAIN P.W.B.
BOARD
25A FUSE
L
SURAGE-
ABSORBER
N
CT1
L001
0V
0V
+
+
This circuit full-wave rectifies 220-230V AC applied between terminals L and N, and boosts it to a required voltage with the
active module, to create a DC voltage.
The voltage becomes 320-360V 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 220-230V AC from terminals L and N
to a DC power supply.
NF COIL1 COIL POWER RELAY
R007
R509
L002
DIODE
STACK2
R002
C014 C007
C012
C013
C015 C007
REACTOR
DIODE
SPM2
STACK1
TB7
(D25VB60) +
TB8
R008
ICP RELAY
TB2
-
Fig. 1-1
<Reference>
In case of malfunction or defective connection:
Immediately after the compressor starts, it may stop due
to "abnomally 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 contact:
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 due
to "Ip", "anbormally low speed", etc. immediately after it
starts, or it may not operate at all because no DC voltage
is generated between the positive + and negative -
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
generated and the compressor may not operate at all.
Also, be aware that the 3A fuse might have blown.
– 106 –
TB6
TB4 TB5
+
C101
TB10
TB11
TB12