Power Module Circuit (U + Is On, V - Is On) - Hitachi RAF-25NH4 Service Manual

B
R24
DC current (Id)
detection resistor
Since current flows at point
●
intermittent waveform as shown in Fig. 3-3. Since 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)
260-330V
+
+
U
U
Fig. 3-4 Power module circuit (U + is ON, V - is ON)
only when U + transistor is ON, the current waveform at point
System power module(for B cycle)
SPM2B
SPM2A
System power module (for A cycle)
Fig. 3-5 Parts location
System Power module 2
+ +
W
V
V W
FAN-HIC
ABS
Wiring for system power module A
(Connecting to the micro computer for A cycle)
※
214
A U coil
U
V
W
V coil
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.
Self-diagnosis lamp
In case change, make sure that CN11A,
CN13A and CN14A are inserted
completely.)
DC compressor
motor
W coil
becomes
For reactor
relay