| 摘要 |
PURPOSE:To make rotation of a fan maintainable well even when anything trouble and the like happen in each switch available, by providing these elements such as a water temperature switch, an air conditioner relay, etc., with something carrying normally closed contacts, while controlling a fan control relay via a series circuit for these normally closed contacts. CONSTITUTION:When this control method is applied to a fan motor 3 cooling condensers for a radiator and a car air conditioner, an air conditioner relay 7 to be excited by a series circuit for a fan switch 4 and an air conditioner switch 5 is installed so as to cause its normally closed contact 7A to make up a continuous rating circuit for the magnet clutch of a compressor 8 of the air conditioner. Likewise, a normally closed contact 7B is installed in parallel with the exciting coil circuit of a fan control relay 9 while a normally closed contact 9A of the relay 9 is installed in parallel with the continuous rating circuit of the fan motor 3 in the same manner. And, a water temperature switch 10 makes its normally closed contact connect the normally closed contact 7B of the air conditioner relay 7 in series, and so constituted as to make up the continuous rating circuit for the exciting coil circuit of the said relay 9. |
