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可控硅无级调速是一种较为理想的调速装置,它具有调速范围宽,性能稳定等优点。但在使用过程中往往因磁场整流出故障(即磁场失压时),操作人员又来不及切断主回路输出电压,则将使直流电机产生飞车,使大功率整流管可控硅以及交流接触器、直流电机等发生烧毁而造成重大的安全事故。为了避免这类事故的发生,我们在磁场整流输出端接一继电器,型号为 JQ-3型,工作电压为220V,触点负荷为220V、5A(交流),安装的位置为下图中的虚线 J_5。J_5的线圈是接在4只磁场整流二极管的输出端,与电机磁场线圈 L_1、L_2并联,而电机电枢电压是分别通过交流接触器 J_1,J_2、J_3、J_4的触点接通和变
SCR stepless speed control is an ideal speed control device, it has a wide range of speed, stable performance and so on. However, in the course of the use of the magnetic field is often rectified out of the fault (that is, when the magnetic field loss of pressure), the operator too late to cut off the main circuit output voltage, the DC motor will produce speed, high-power rectifier thyristor and AC contactor, DC motor burned and caused a major safety accident. In order to avoid such accidents, we have a relay connected to the rectified output of the magnetic field. The model number is JQ-3. The working voltage is 220V, the contact load is 220V, 5A (AC), and the installation position is the dotted line J_5. J_5 coil is connected to the output of four magnetic field rectifier diodes, and the motor magnetic field coils L_1, L_2 in parallel, and the motor armature voltage is respectively through the AC contactor J_1, J_2, J_3, J_4 contacts connected and variable