– 42 –
Model RAC-25CNH2
1. Power Circuit
A
15A FUSE
SURCE-
ABSORBERA
VARISTOR1
VARISTOR3
CT1
C502
C507
C513
C508
C514
R504
C501
C505
R503 R502
C501
R531
R532
R533
C504
POWER MODULE
R534
RCP RELAY
0.35mH
C506
3.15A FUSE
R505
DIODE
STACK
VARISTOR2
C510
C511
R510
R511
C503
C512
0V
BLK
WHT
GRN
NF COIL1
COIL
NF COIL2
RED
RED
TERMINAL
BOARD
B
ACT MODULE
MAIN P. W. B
REACTOR
1
11
Fig. 1-1
●
This circuit full-wave rectifies 220-240V AC applied between terminals A and B, and boosts it to a required
voltage with the active module, to create a DC voltage.
The voltage becomes 260-380V 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 A and B 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 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 bridge 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 bridge 1 is faulty, be aware that the 25A
fuse might also have blown.
●
If diode bridge 2 is faulty, DC voltage may be not
generated and the compressor may not operate at
all. Also, be aware that the 3A fuse might have
blown.