Hitachi RAF-25NH5 Instructions De Service page 260

B
R24
DC current (Id)
detection resistor
ince current flows at point
●
intermittent waveform as shown in Fig. 3-3. ince current at point
current of the air conditioner, input current is controlled by using DC current (Id) detection resistor.
<Reference>
If power module is detective, self diagnosis lamps on the main P.W.B. may indicate as shown below:
Reactor (for B cycle)
Reactor (for A cycle)
Fig. 3-5 Parts location
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ystem Power module 2
260-330V
+
+ +
U
V
Ð
Ð
U
V
Ð
Fig. 3-4 Power module circuit (U + is ON, V - is ON)
only when U + transistor is ON, the current waveform at point
ystem power module(for B cycle)
FAN-HIC
SPM2B
SPM2A
ystem power module (for A cycle)
- 290 -
A
+
W
U
V
W
Ð V coil
W
is approximately proportional to the input
Wiring for system power module B
(Connecting to the micro computer for B cycle )
In case of change, make sure that CN11B,
※
CN13B and 14B are inserted completely.
ABS
Wiring for system power module A
(Connecting to the micro computer for A cycle)
In case change, make sure that CN11A,
※
CN13A and CN14A are inserted
completely.)
DC compressor
motor
U coil
W coil
becomes
For reactor
relay
elf-diagnosis lamp