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水位自动控制与水泵故障自动停机报警器的工作原理如图所示。它包括:水位自动控制、水泵故障自停报警以及主控制电路等几个部分组成。一、水位自动控制工作原理用三根电极棒A、B、C,根据对控制水位的不同要求,将其固定在规定的高度位置上。当水位低于位置A时,A、B两点未接通,BG_3的基极未获得偏置电压,处截止状态,J_2释放,发出低水位信号。由于主控电路中的J_2常闭触点闭合,使交流接触器C线圈通电,接触器闭合,接通水泵电机D,水泵开始工作。当水位上升到位置B以上时,A、B接通,BG_3基极获得负偏压,BG_3导通,J_2吸合,发出高水位信号。此时由于主控电路中J_2常闭触点断开,C线圈失电,接触器断
Automatic control of water level and pump fault automatic shutdown alarm works as shown. It includes: Automatic water level control, water pump fault self-stop alarm and main control circuit. First, the automatic control of water level Working principle with three electrode rods A, B, C, according to the different requirements of the control of the water level, it will be fixed in the specified height position. When the water level is lower than the position A, the two points A and B are not connected, the base of the BG_3 is not biased, and the cut-off state is released. The low water level signal is emitted. As the main control circuit J_2 normally closed contact closure, so that AC contactor C coil power, contactor closed, turn on the pump motor D, the pump began to work. When the water level rises above the position B, A, B is connected, the base of BG_3 is negatively biased, BG_3 is turned on, J_2 is sucked in, and a high water level signal is emitted. At this point due to the main control circuit J_2 normally closed contact is disconnected, C coil power loss, contact broken