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C032
R008
Fig. 7-4 Power module circuit (U is OFF, V is ON)
+
–
Since current flows at point B only when U
+
transistor and V
–
transistor are ON, the current waveform
at point B becomes intermittent waveform as shown in Fig. 3. Since current at point B is approximately
- 7
proportional to the input current of the air conditioner, input current is controlled by using DC current
(Id) detection resistor.
<Reference>
If power module is defected, self diagnosis lamps on the MAIN P.W.B. may indicate as shown below:
a T
b
e l
7
1 -
Fig. 7-5
68
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