220V Cooling Fan monitor mode

 So far there are alarm sensors and the speed sensor are two types of "220V Cooling Fan" self-monitoring methods, the use of the alarm sensor in the fan speed is lower than an alarm signal when a certain threshold, and the fan speed signal output can be realized Real-time monitoring of speeds. "dota2雷竞技下载 " circuit outputs an alarm signal from the "high" and "low" states, meaning two levels represented by the general system in accordance with positive logic, high indicates "failure", " low "for" normal. " To distinguish "220V Cooling Fan" Speed is real or a multiple speed, tachometer may be used to measure the actual speed, and data were then compared.