How To Control A 3 Phase Motor With Plc Vfd Delay Progr The plc program interlocks the forward and reverse rotation of the motor to prevent the wrong touch of the motor's reverse rotation button. plc and the vfd i. By editorial staff. this is a complete tutorial about plc ladder logic to control variable frequency drive (vfd) for motor speed control with speed selection from field local panel or scada graphics. execution steps : prepare a control and power drawing. commissioning and parameters programming in vfd.
3 Phase Vfd Motor Control Circuit Diagram The vfd can be controlled remotely by using plc dcs systems. the plc has to give set point for vfd drive to control the motor speed, this can achieved either automatically from the plc or by the operator action from the hmi. according to set point value, plc will control the drive speed and vfd drive finally controls the motor speed. Before examining the plc program, first consider a hard wired approach. basic plc program for control of a three phase ac motor for beginners (on photo: simatic s7 1500 plc; credit: siemens) the following line diagram illustrates how a normally open and a normally closed pushbutton might be connected to control a three phase ac motor. in this. Ladder logic description. in this application, we will use siemens s7 1200 plc and tia portal software for programming. we can also design this logic with relay circuit. this circuit is also known as forward reverse control for 3 phase induction motor. we will write logic for forward condition in network 1. Fig. 9: ladder program for control using the plc fig. 10: control board for motor control operation. programmable logic controllers (plcs) support digital input output very effectively. so a plc can also be used to control the operation of a vfd, hence to finally control the connected 3 phase induction motor. fig. 11: allen bradley plc connection.
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