– 61 –
1. Power Circuit
● This circuit full-wave rectifies 220-240V 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 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.
< Reference >
● In case of malfunction or defective connection:
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
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
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
generated and the compressor may not operate at
all. Also, be aware that the 5A fuse might have
blown.
Fig. 1-1
TB2
TB8
TB7 TB6
TB10
TB11
TB12
U
V
W
N1
L1 L2
DIODE
STACK 1
(D25VB60)
REACTOR
SPM2
P1
Vdb
POWER CIRCUIT
Power P.W.B.
TERMINAL
BOARD
a
25A FUSE
NF COIL1
GRN1
GRN2
GRN3
L006
R009
CT1
WHT
BLK
JW5
COIL
POWER RELAY
INRUSH CURRENT RELAY
DS
C103
C017
L007
SURGE
ABSORBER
R001
JW3
R003
R002
VARISTOR2
VARISTOR3
VARISTOR1
C023
C022
C001
C002
C024
C025
C003
R004
C005
C004
C858
C859
C006
L005
5A FUSE
C020
C013
C014
R005
C007
C008
0V
L
N
RAC-50DH7, RAC-60DH7, RAC-70DH7
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