This motor speed control system was designed as an frequency controller, operated by a stored program in the plc. Controlling 3 phase induction motor using vfd and plc. Programmable logic controller plc industrial plc describe the computing unit of any industrial automation system and therefore need to meet several challenging requirements such as high. A plc has to start a motor when the start button is pressed. While the lighting control system previously discussed is useful to explain basic plc operation, a more practical, and only slightly more complex, application is startstop control of an ac. Closedloop control can be performed based on the speed, acceleration, or torque in addition to the position. The paper proposes a method of programming and controlling. A programmable logic controller plc is a special form of micro. Pdf design and implementation of plcbased monitoring control. They are called ladder diagrams because they resemble a. Ladder logic diagram, the plc program, uses step ladder instructions for implementation of the control algorithm.
Introduction to programmable logic controllers plcs. While controlling servo motor from plc, we will require a servo drive. Data transmission to control the motor was provided by the plc and the distributed io via. Control of induction motors by using programmable logic. This version of internet explorer is either no longer supported by microsoft, or is obsolete. Motor starter coil is energized when both the pressure. Electric motor drive installation and troubleshooting is designed for technicians in the field responsible for installing, programming.
It is used in conjunction with a stepper motor to control the position of a rotating dial. Differential pulse train output pto programmable logic. Pdf design and development of plc and scada based control. Unit 1 basic principles of motor controls unit 1introduction this unit discusses the basic concepts of motor control, including motor control language and the types of wiring diagrams used. Programmable logic controllers nfi automation academy. However, since the operator must open a guard to remove the part, you should also include a bypass switch that disconnects all. Sequence control is used extensively and is a vital approach in all situations and all fields. Ladder logic program for motor control is explained below. Pdf the paper is presenting a simple and cheaper solution for programming and controlling of stepper motor in unipolar connexion by using a. A common plc application is the speed control of ac motors with variable speed vs drives. Electrical motor control circuits is a product developed by business industrial network. Lecture introduction to plcs mme 486 fall 2006 27 of 47 plc mixer process control problem mixer motor to automatically stir the liquid in the vat when the temperature and pressure reach preset values. The following circuit is for a stepper motor controller.
This ti design is mainly used in positioning and motion control systems to allow simple. Electric motor drive installation and troubleshooting, 3e. In this project i am posting the project related ladder diagrams and connection diagram. This video describe how to connect a stepper motor and control it with a plc delta dvp ss2 we will be using the instruction ddvra con. This is plc program to control motor speed using vfd drive. Chapter 9 discrete control using programmable logic. Diagram, the plc program, uses step ladder instructions for.
This site is not directly affiliated with business industrial network. Inputs are usually sensors or switches that control outputs such as motors and electric pumps etc. Plc is a special form of microprocessorbased controller that uses programmable memory to store instructions and to. Technical explanation for servomotors and servo drives. Vidcl0020 live demo of how to control a sure step stepping system using a click plc. Plc application for speed control of ac motors with vsd. A plc can communicate with other controllers or computer equipment. Respected members, i recently join industrial job as an automation engineer. Plc is a special form of microprocessor based controller that uses programmable memory to store instructions and to. Thus, similar to other computerized devices, the plc unit has. The motion control method without using feedback is called open loop. Thus, the plc correlates and the temperature values of the motor, and controls the. Tutorial motor control o shows you how to make a small control circuit, where all components are found in the component database. Speed control of three phase induction motor using plc.
The pmdc consists of rotor or armature and a stator, which is a permanent magnet. Sequence control is used not just in complex applications but also in applications very familiar to us. The ladder logic for a stardelta motor control is quite simple, and that is one of the advantages of using a plc for motor control. Presented here is a robust system for switching onoff, varying the speed and direction of rotation of. The paper highlights the simplicity and ease of configuration control and programming of the stepper motor by using a plc. In this application plc is used to control the operation of a stepper motor. Basic plc program for control of a threephase ac motor. Here i have to design program for mitsubishi plc to control servo. Ladder diagrams are specialized schematics commonly used to document industrial control logic systems. Motor speed control using vfd and plc programming ladder. Introduction machine control design is a unique area of engineering that. Ladder logic ladder diagrams ladder diagrams are specialized schematics commonly used to document industrial control logic systems. Direction control of dc motor using plc circuit 2 connect. Step motor control by using plc programmable logic controllers.
Plc programmable logic controller that sends commands to the motor controller such as motor start, motor acceleration, speed adjustment, motor stop, etc. The vfd can be controlled remotely by using plcdcs systems the plc has to give. Here i am posting another plc related project, which is the direction control of dc motor using plc. Electrical motor control circuits free download for. Early machines were controlled by mechanical means using cams, gears, levers and other basic mechanical. Motion controller module for allenbradley compactlogix amci. Outputs are connected to devices that control the process. Plc program can turn off the motor rotating a saw blade. Plc motor control ladder logic programming motor control. The finished project contains electrical diagrams, panel mechanical.
A power factor controller for a threephase programmable logic controllers plcs, variablefrequency induction motor utilizes plc to improve the power factor. Programming a plc is easier than wiring a relay control panel. Relays, motors, solenoids and other outputs are some examples. The plc motor control training system adds to amatrols electric motor control system 85mt5 and covers indepth topics like plc program execution, plc program editing and documentation, sealin. Brushless dc motor bldcm is a high performance, low maintenance cost, adequate torque, high speed, high reliability motor and widely used in industries having several advantages over other type of. There are two motor m1 and m2 one allows forward rotation and the other one allows reverse rotation.
A pulse wave pwm is one that controls stepper motors and positional movement. Servo drive will take the command pulses from plc output and will rotate. They are called ladder diagrams because they resemble a ladder, with two vertical rails. Logic controller plc instead of microcontrollers chips.
1172 1191 1270 766 231 1500 440 171 399 785 180 809 544 1065 621 221 1019 1477 424 1490 1089 1330 278 1367 830 1360 484 1385 996 1084 1261 385 1414 1002 1390 333 403