The reading method and steps of electric control schematic diagram

Division principles, ultimately, auxiliary, zero for the whole set, after the home, security protection, comprehensive inspection. Based on the principle of division to a motor or electrical components ( Such as contactor or relay coil) As the object, starting from the power source, from top to bottom, from left to right, analyze the relationship between on off. Analysis method and steps of (1) analysis of main circuit in any circuit design and circuit analysis are, first, from the perspective of the main circuit. The role of the main circuit is to guarantee the realization of the machine tool drive requirements. The motor can be analyzed from the structure of the main circuit, or perform electric types, works of starting, steering, and brake control requirement of speed and protection requirements, etc. (2) analysis of the control circuit of main circuit of each control is implemented by the control circuit, using the principle of 'division' and 'hildesheim, could be divided into a number of local control circuit according to the function of control circuit, starting power and command signal, through logic, write control process, to express the circuit is simple and straightforward way of working process automatically. (3) analysis of the auxiliary circuit auxiliary circuit including the working state of the actuators display, power, determination of parameters, such as lighting and fault alarm. This part of the circuit has the relative independence, but does not affect the main function of a supplementary role. Many parts in auxiliary circuit is controlled to control in the circuit components. (4) analysis of the mechanical interlock and protection link production for requires a high degree of safety, reliability, implementing these requirements, in addition to reasonably choose drag, control scheme, in the control circuit is also equipped with a series of electrical protection and the necessary electric interlocking. In the process of the analysis of the electric control schematic diagram and electric interlock and electric protection link is an important content, can't miss. (5) the overall inspection after the 'pieces', gradually working principle of each local circuit is analyzed and the control relationship between the parts, also must use the method of 'collection of zero for the whole' check the whole control circuit, to see if there are omissions. In particular, from the overall Angle to further check and understand the link between each control node, in order to achieve the correct understanding of schematic diagram of the role of each of the electrical components.