Manual control principle of fire exhaust fan
In fact, the fire engine will also control the starting of the air outlet through the two bus module, so that there is a strong current, weak current and a common control point, and the actual implementation will be difficult. This is what you said, "second.".
This question is indeed a considerable gap between theory and practice, theoretically absolutely no problem, in fact, can not be achieved.The theory is that the smoke exhaust port is opened at the scene and the exhaust fan is started. When the exhaust temperature is too high, the fan stops when it reaches 280 degrees, which is what you call "scene"".
At the same time, in order to lower the fire under the condition of reliability, fire protection requirements, in the case of the system failure, and then by the automatic control cabinet from the fire control room all the way hard cable, directly start and stop the fan, that is, you said the 7 lines.
