Two maincoilsarewoundoverstatorcore.Eachmaincoiloutputs half theratedpower atthelower
voltage (llOV or120V).Thesemaincoilsarewound to be inthesamephase.Thefullpowerswitch reconnects these main coils in parallel or in series.
Fig.5-9showsacircuitdiagram.Whenthefullpowerswitchissetforsinglelowervoltageindication
(llOV or 120V), the switch position is as indicated by the lower solid line in the diagram. Fig. 5-10 is a simplified representation of this circuit, showing the two main coils connected in paralle1.h this case, the higher voltage (220V or 240V) at Rec. 3 cannot be taken out. Rec. 2 for the lower voltage can output up to the rated power (up to 30A if the rated current is over 30A), and Rec. 1can output up to a total of 15A. When the full power switch is set for double voltage indication (llOV/220V or 120V/240V), the switch position is as indicated by the upper dotted line in Fig. 5-9. Fig. 5-11 is a simplified representation of this circuit, showing the two main coils connected in series. In this case, power can be taken simultaneously from the receptacles for the both voltages. Rec. 3 for the higher voltage can output up to the rated power, but Rec. 1and Rec. 2 for the lower voltage can output only upto half the rated power each.
Table 5-4 is a summaryof the above explanation. Select the proper output voltageby full power switch in accordance with the appliance to be used.
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