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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. 4-3. Since current at point B is approximately
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:
Fig. 4-5
Fig. 4-4 Power module circuit (U
+
–
is OFF, V
Table 4-1
Self-diagnosis
Ip (peak current cut)
Abnormal low speed
rotation
Switching incomplete
– 45 –
is ON)
Self-diagnosis lamp
and mode
Blinks 2
LD301
times
Blinks 3
LD301
times
Blinks 4
LD301
times
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