| 摘要 |
PURPOSE: Operating circuit system of unit fan is provided to enable the unit fan to operate by sending a selecting power output from an input AC(alternating current) 440V power and a battery via a switch through an auxiliary power supply device as a battery power even in case of main power supply stopped. CONSTITUTION: Between a main power supply input unit(1) and a unit fan(5), a switching-over switch(3) is connected and voltages of the main power supply input unit and of a transformer(4) are selectively sent to the unit fan(5). Fuses(2,7) are connected between the main power supply input unit(1) and the switching-over switch(3) and between a battery power supply(8) and an inverter(6). Correspondingly, at usual times, the unit fan is operated via 440 v power of the main power supply input unit(1) and in case power is not supplied from the main power source unit, the switching-over switch is switched to the battery power circuit for supplying direct current 72 v generated at the battery power source to the inverter(6). The inverter converts direct current to an alternating current to send out to the transformer and the transformer boosts up the alternating current to three-phase AC 440 v for operating the unit fan.
|
