Hitachi RAC-08PH1, Руководство по обслуживанию, Страница: 51 / 114

Fig. 3-4 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. 3-3. 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:
LD303
LD302
LD301
MAIN P.W.B.
SERVICE SWITCH
HIC
IPM
Fig. 3-5
Table 3-1
RA H1/RAC-10PH1 08 C-
RAC-14PH1
DC VOLTAGE CHECKPOINT(-)IPM(33)#PIN
DC VOLTAGE CHEC)IPM(25)#PIN
SELF-CHECK
CONNECTOR(CN30)
TEST SWITCH
P
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