Hitachi RAF-25NH4 Données Techniques page 181

Functions of Main Parts
●
(1)System Power Module (SPM)
(The module was a new type which joined
together old type ACT and POWER modules)
ACT Module part
①
The active filter, consists of the reactor and
switching element, takes away higher harmonic
components contained in the current generated
due to the compressor operating, and improves
the power factor.
Power Module
②
See 3. "Power Module Circuit".
(2)Diode stack A(B) , DB1
The parts rectify the 230V AC supplied terminals
L and N to a DC power supply.
(3)Smoothing capacitor (C501, C502, C503: 330µF 420V)
The condensers boost up the voltage to be rectified by the diode stuck and smoothes it.
(3)Smoothing capacitor (C015: 270µF 450V, C201: 10µF 450V)
The condensers boost up the voltage rectified by the diode stacks and smoothes it.
DIODE STACK
for B cycle
REACTOR
for B cycle
SPM2B
REACTOR
for A cycle
SMOOTHING CAPACITOR
SPM-B
FAN-HIC
SPM2A
ABS
SMOOTHING DIODE STACK
CAPACITOR SPM-A for A Cycle
Fig. 1-2
< Reference >
In the case of malfunction or defective connection:
●
Immediately after the compressor starting, it may stop
due to "Abnormal low speed" active error etc.
And 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.
< Reference >
In the case of defective diode stack A(B),:
●
Two situations happen, one of them, the compressor stops
to cause "IP" "abnormal low speed", etc. immediately after
it starts, and another, it does not operate at all because no
DC voltage is generated between (+) and (-) terminals.
If the diode stack A(B) is faulty. Also, be aware that the
●
30A fuse might have blown.
If DB1 is faulty, the compressor does not operated at all
●
because no voltage is generated on the parts of the control
P.W.B.
If DB1 is faulty, be aware that the 5A fuse (or R004) might
●
also have blown.
Be careful to avoid an electric shock as a high voltage
is generated on each part. Also, take care of a short
circuit accident due to wrong connections of test equipment
terminals, or the P.W.B. may be damaged.
SELF-DIAGNOSIS LED
200
2P-TERMINAL
BOARD
2P-TERMINAL
BOARD
SWITCH for
After Servicing