Swept away!

The reason why the breaker 3A fuze melts down so often in the working chair was cleared yesterday and also counter-measured for them. As for my first planning, the vacuum motor controlling single relay is so designed to be activated by four signals from working chairs and the signal wiring had been connected at the relay terminal portion, leading to sending unnecessary signal to unnecessary places as some feed back phenomena.
So, all four solenoid valves had been opened when only one working chair was in action, naturally the required current would be four times more?

I conclude that the inconvenience in the electric circuitry occurred as a natural phenomena, the play of fuze parts should be opened in case of overflowing, yes it happened as it should be so.
New designing of solenoid and vacuum pump activating relays were designed to activate one by one installing four mechanical relays, four rectifiers and four smoother on the board.

Additionally, Triac circuitry was also on-boarded to control the vacuum motor rotation seeking the best working efficiency.
I knew that my hypothesis was to the point that the suction power is mainly controlled by the conduit resistance of the duct designing and the power of suction is not influenced by the vacuum motor power if the intake air bulk should comes to the saturation point.

The conduit resistance is huge enough to show the dust full indicator immediately after connection in spite of empty dust room.
I came to the conclusion that the vacuum motor power could be reduced in rotation per minutes by means of Triac controlling.
The establishment of prolonging the life of the devices and calm and silent circumstances were obtained both together.
My hypothesis have proved to be correct by the actual experiment by myself!