Fundamentals of electrohydraulics collection of transparencies. Hydraulic and electrohydraulic control systems springerlink. Ecus were developed to replace the older sequential relay circuits, that were used for machine control. Pdf design, analysis and simulation of hydraulic circuit. We use lean solution to bring together the worlds of hydraulics and electrical engineering in the field of automation. This project presents a study of the electro pneumatic control system and its design using plc, as well as an introduction to its used in applications with mentioned few of those applications, also types of circuits that use this kind of control system and we will have one type of these circuits which will be discussed in. When pushbutton s1 is pressed, coil r1 will be activated. Electrohydraulics workbook basic level tvet vietnam. Installation and setup manual electrohydraulic control. The workbook is included on the cdrom as a pdf file.
Course objectives at the conclusion of this course, students will be able to. Electronic and electro hydraulic controls introduction to electrohydraulic control technology. In the case of stationary hydraulics, however, mainly solenoid valves are used. Pdf electro hydraulic circuit notes, spring 2008, university of. Automation studio hydraulic, pneumatic, electrical and. Electrical actuation fewer losses than hydraulic actuation only needs to be turned on when in use tend to be more reliable, cleaner, and safer vehiclelevel design and optimization integration with other systems optimization of integrated systems simulation can help with each of these strategies. Hydraulic training associates provides more then just training, we can re. Also known as tractor fluid, hydraulic fluid is the life of the hydraulic circuit. Hydraulic schematic symbols airline hydraulic s main page basic symbols linescontinuous line flow line dashed line pilot, drain envelope long and short dashes around two or more component symbols. The many advantages of closed circuit systems include. Electrical circuit a circuit consists of at least a power source, a load device and connecting lines. Festo fluidsim hydraulics is a professional application to deal with the creation, simulation, and the training of the electro hydraulics, electro pneumatic and electronic circuits.
A characteristic feature of mobile hydraulics is that the valves are frequently manually operated. Pid circuit in the amplifier controls the way the system approaches the desired output. How to develop multipleactuator pneumatic circuits using. With over 8,000 employees worldwide, hydac is one of the leading suppliers of fluid technology, hydraulic and electronic. Electrical current will flow only in a closed circuit. Two positions of a selfexplanatory electro hydraulic circuit for the direct control of a doubleacting cylinder are given below. Hydraulic fluid can cause contamination, cause burns due to temperature and other injuries due to high pressure. We compared the experiment circuit with actual circuit. Current sensing circuit maintains output current regardless of changes in input voltage and coil resistance. We recommend that this should be set to a maximum pressure of 5 mpa 50 bar. The fabrication part of it has been considered with almost case for simplicity and economy, such that this can be accommodated as one of the essential tools on automobile garages. A force feedback mechanism is used for main spool positioning, and amplification is performed by the pilot spool. The ecu works by measuring its inputs and depending on their state.
Hydraulic systems volume 2 electrohydraulic components. The relay mainly consists of a coil and a number of independent contact sets. Draw the electro pneumatic circuit direct control using the fluidsim software 2. This valve is a cartridge style, electro hydraulic, proportional,this valve is a cartridge. When analyzing or designing a hydraulic circuit, the following three important considerations must be taken into account. Electrical current flows from the positive terminal of the power supply to the negative terminal. A hydraulic circuit, whether it is simple or complex uses the basic hydraulic principles discussed on the.
The set of equipment for basic level tp101 enables the assembly of complete control systems for solving the problems set in the 20 exercises. General troublefree operation of any machine or installation depends upon the manufacturers operating and servicing instructions being complied with. A memory function can be implemented in electro hydraulic circuits by using an electrical latching circuit or by using a double solenoid valve. Introduction to electrohydraulic control technology. Examples of accumulator uses are backup power for steering or brakes, or to act as a shock absorber for the hydraulic circuit.
Covers hydraulics math, pascals law, hydraulic schematics, fluid properties, series and parallel hydraulic circuits, regenerative extension, accumulators, flow control valves and flow control methods, pressure control valves, pumps, and electrically controlled hydraulic. Pdf file of this page valve coils and electronic controllers toc. Electro hydraulic control system for variable dis placement hydraulic machines thus without change in pump construction, this can be integrated into any control circuit for adjustable. Most of the practical pneumatic systems involve the use of multiple actuators cylinders, semirotary actuators, etc which when operating in specified sequences carry out the desired control tasks. Dynamic braking of a load without adding additional heat wide range of control options from manual to electro hydraulic accurate control of speed and force smaller hydraulic reservoir space and fluid requirements fewer components required in. Pdf applications of electrohydraulics actuators researchgate. Learning system for automation and technology pneumatics, basic level. The electromagnetic circuit of a nozzle flapper or jetpipe torque motor is essentially the same.
The theoretical basis required for an understanding of this collection of exercises can be found in the following textbook. Automation studio educational edition designed by famic technologies inc. You can add your own load and performance values to understand how your own systems will work. Hydraulic circuit design and simulation pneumatic circuit design and simulation electro hydraulic and electro pneumatic circuit design and simulation fluid power component sizing electrical control circuit design and simulation. It is usually petroleum oil with various additives. Test the circuit functions against any errors or mistakes. Introduction of a power supply to complete the circuit.
Hydraulic circuit design and analysis a hydraulic circuit is a group of components such as pumps, actuators, and control valves so arranged that they will perform a useful task. Production and interpretation of standard hydraulic and electrical circuit diagrams. Electroproportional cartridge valves sun hydraulics. The modular structure of the learning system permits applications to be assembled which go beyond. Abs hydraulic modulator unit contain the valve, solenoid and piston. The book contains animated circuits files to download.
The speed of the forward and backward stroke of the cylinder rod is adjustable 3. Hydraulics and electrical control of hydraulic systems. Mobile hydraulic systems move on wheels or tracks, for example, unlike stationary hydraulic systems which remain firmly fixed in one position. For more information on this and much more call today. Every time a control circuit is assembled on the pro file plate, a second pressure relief valve is used. In electro pneumatics, the pneumatic components are controlled by using electrical and electronic circuits.
Initial start up and maintenance advanced fluid systems. We will also learn about various hydraulic components and their function. We will be adding lots of example training circuits within this software. Doublepilot directional control dc valves are used as final control elements to control the forward and return strokes of the actuators. The ramp generator is used to control the rate of change of the amplifiers output and consequently controls the rate at which the valve opens or closes. Graphical hydraulic circuit diagrams incorporating component symbols are used to explain the operation of the circuits. Short circuit proof and reverse polarity protected. Hydraulic installations can be of the most varied design and construction and, as. Hydraulics hydraulic controls division electro hydraulic proportional controls for installation and setup manual axial piston pumps, pv series the module offers a gain adjustment to match the setting of the control circuit with the dynamic response of the hydraulic system. Relaybased electrohydraulic systems fluidsys training. Under hard braking condition, this assembly control the holding and release of the different hydraulic brake circuit. Highlow range input provides reduced output for training or operation of equipment in tight spaces. A circuit device with a memory function remembers its last output state even after the input signal from the input signal responsible for this output has been removed.
This simulation program allows you to select from different hydraulic circuits and test how they work. We will look at fundamental principles and how they pertain to hydraulic systems. Explain the role of various electro pneumatic and hydraulic components within a given system or module. Interpret hydraulic system symbols and circuit diagrams describe techniques for energy saving in hydraulic systems introduction typical hydraulic circuits for control of industrial machinery are described in this lesson. The key to unlocking the benefits of hydraulic power is understanding the system requirements. Hydraulic circuits and components this study guide will discuss basic hydraulic systems. Sensors in electro pneumatics limit switches 7 1 required procedures direct control 1. Electronic and electromagnetic sensors, electrical switches and industrial computers are used to replace the manual. Electro hydraulic power steering systems the first version of electric power assisted steering epas was the changing of the power source for the traditional hydraulic power steering from a mechanical pump, driven off the engine via a belt drive arrangement to an electrically driven pump. The electrohydraulics learning system 85 eh teaches electrical relay control of hydraulic sys tems and their industrial. Design, analysis and simulation of hydraulic circuit.
The electrohydraulics learning system 85eh teaches electrical relay control of hydraulic sys tems and their industrial. Electro hydraulic power steering ep as systems electric. Sun three port proportional pressure reducingrelieving valves offer electro proportional pressure control with relief capacity. Initially, the 43 dcv single solenoid is at a stable state center dominant. Validate the hydraulic circuit and the electric circuit for any misconnection. Basic circuits most people have an intuitive concept of brief overview of fluid power what at basic cylinder circuit or motor circuit would look like. More advanced electrohydraulic circuits can be set up with this equipment set. Connect the hydraulic circuit according to figure 1. The files are produced by automation studio to presents examples of electrical circuits that drive switching valves. The differences between the two lie in the hydraulic bridge design.
Correct schematic reading is the most important element of hydraulic. The electrohydraulic electro pneumatic equipment and system is an integration of electrical and mechanical components with compressed liquid air source. You may take a serious look at the circuit for the proper understanding of the electro hydraulic system. Service manual pve and pvhc for pvg 32100120 general information l1223449 rev ab apr 2014 7. The hydraulic power pack and electrical power supply must be. These valves are also available in standard and inverse functionality. Basic electrohydraulic component symbols and circuits kgrtc.
233 52 432 564 141 1637 14 1363 883 1394 862 1275 211 1362 263 105 1229 860 1335 184 772 1484 414 662 871 1398 267 482 1123 889 1179 1033 224