Power Circuit; Reactor And Power Capacitor; Diode Stacks - Hitachi RAS-25CNH1 Service Manual

Model RAC-25CNH11

1. Power Circuit

Terminal
board
15A fuse
A
‡ ‡
0 0
Black
Varistor 1
0
Surge

absorber
Green
0 0 0
Varistor 3
B
0 0
White
This circuit full-wave rectifies 220V AC applied between terminals A:B to produce a DC voltage of
at the positive and negative terminals. However,
is operating.
t
The following describes the main parts components.
TT

(1) Reactor and power capacitor

The filter consisting of a reactor and power
capacitor removes high harmonics
components from the current containing
high harmonics occurring when the
compressor is operating to improve the
power factor.

(2) Diode stacks

These rectify the 220V AC from terminal
boards A and B to a DC power supply.
NF coil
0 0 0
C807
C812
Inrush current
C805
0 protection relay
C806
R807
C813
C808
0 0 0 0
L804
Diode stack
Reactor
Stick relay
£ £
‡ ‡
zzz
‡ ‡
£ £
‡
‡ 0
Power relay
220 x 2= 310V
the voltage is approx. 260-290V when the compressor
< Reference >
If the reactor is faulty or the connection is defective,
the compressor may stop due to "abnormality in
line voltage", etc. immediately after it is started.
< Reference >
When diode become defective, the compressor may
stop due to" abnormality in line voltage", etc.
immediately after it is started or no operation may
be done as a DC voltage is not generated between
the positive
When diode stack becomes defective, check
whether the 15A fuse has blown.
– 62 –
0 0 0
0 0
R802
0
R801
zzz
R806
0 0 0
0V
DC voltage DC current
detection detection
circuit circuit
and negative
1
!
0
terminals.