This equipment includes programmable logic controllers plcs timing relays and coupling modules, whose. In general contactors are intended to control higher levels of current. Fused control circuit transformer and control relay. This is a glimpse of a course on plc programming course level1. The coil energizes the contactor, moving the contacts into position.
The control circuit contact must be wired in series with the coil of the contactor so that the contactor will deenergize when an overload occurs. Bussmann series electrical circuit protection products and accessories. It also depends on factors like fault withstand current, coil voltage and so on. Dpdt relays the first thing i did was order some relays. Devices covered in basics of control components are used with programmable logic controllers. Contactors and relays contactor relays eaton wiring manual 0611 53 55 the system and the standard european standard en 50011 terminal markings, distinctive numbers and reference letters for certain contactor relays has a direct bearing on the use and application of the modular system.
For example, in figure b1, the control wiring from the startstop pushbutton station runs to the actual connection points 1, 2, and 3. Relays are typically integrated into a logic circuit together with other relays and. Forward reverse motor control diagram for 3 phase motor. From the logic of design to startup, operation and maintenance, this reference covers all aspects of wiring, relay logic, programmable logic controllers, and a host of electrical control applications and challenges youll encounter on the job. Typically in industrial relay logic circuits, but not always, the operating voltage for the. Rather, the term, contactor is used to describe a type of device that is used very much in the same manner as a relay. Since a contactor should last for years, dont automatically replace one that fails with an identical unit. Continuous motor operation with a momentary start switch is possible if a normallyopen sealin contact from the contactor is connected in parallel with the start switch so that once the contactor is energized it. Mar 22, 2012 please read article about free plc ebook. More specifically, a plc would be used for the automation of industrial electromechanical processes. Hum can also occur if the pole surfaces are deformed. Please click the image below or click here to request your free e book. How to create relay logic circuit with examples engineer. Apr 21, 2016 in previous chapter relay logic circuit rlc we discussed about relay logic elements which are used in relay logic.
Motor control circuits ladder logic electronics textbook. Oct 08, 2016 difference between contactor and relay. Contactor relays contactor relays contactor relays are often used in control and regulating functions. The overload relay must be used in conjunction with a contactor.
An entire book could be written on the principles and practices of good. Magnetic contactor wiring diagram pdf motor control circuit throughout source. Digital systems, number systems and codes, boolean algebra and switching functions, representations of logic functions, combinational logic design, combinational logic minimization, timing issues, common combinational logic circuits, latches and flipflops, synchronous sequential circuit analysis, synchronous. This book is published under the terms and conditions of the design science license. Wiring diagram book a1 15 b1 b2 16 18 b3 a2 b1 b3 15 supply voltage 16 18 l m h 2 levels b2 l1 f u 1 460 v f u 2 l2 l3 gnd h1 h3 h2 h4 f u 3 x1a f u 4 f u 5 x2a r power on optional x1 x2115 v 230 v h1 h3 h2 h4. The beginnings of computing and logic gates starts with telephone companies in the earlymid 20th century, and telephone companies did this with relays. Emergency stop control conforms to stop category 0 of iec602041. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Systemcoordination information ul1008 withstand closing ratings 1. After working through the material in this book, a student should be able to understand most quantified expressions that arise in their philosophical reading. In addition to the simplicity which they offer in project engineering, panel building, commissioning and maintenance, the high.
Type s ac magnetic contactors 3640 class 8502 3640 iec contactors 4142 iec contactors and auxiliary contact blocks 41. Rockis, 2001 oneline diagrams oneline diagram a diagram that uses single lines and graphic symbols to indicate the path and components of an electrical circuit. This book deals with proper and safe installation of. Abb control secrl 2 20010619 the abb range of a the abb range of a contactorscontactors a 9, a 12, a 16 a 26, a 30, a 40 a 50, a 63, a 75 a 95, a 110 a145, a185 a210, a260, a300 af400, af460 af580, af750. The symbols, device designations, and abbreviations in this book are taken from the nema standard publicationno. This book contains a description of electrical relays, their principles of operation, and. Ratings of a contactor are given according to the pole of the contactor.
How to create relay logic circuit with examples engineers. An introduction to formal logic open textbook library. Abb control secrl 2 20010619 the abb range of a the abb range of a contactorscontactors a 9, a 12, a 16 a 26, a 30, a 40 a 50, a 63, a 75 a 95, a 110 a145. Note that one one of the contactor acts as a switch for the start button. Free logic circuits books download ebooks online textbooks. Mini contactor terminal style contact minioverload use upper limit combination in part number nonreversing 6 6a a ac coil 24 24v 10 1 no 12 up to 12a m mini 0. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Oneline diagrams are used when information about a circuit is required.
The electric relay is one of the most frequently used devices in modern technological. Aug 23, 2019 functional safety and as as each socket is designed to work with idec timers and relays, but will work equally well with any fitting component. The auxiliary contact is often used in a relay logic circuit, or for some other part of the motor control scheme, typically switching 120 volt ac power instead of the motor voltage. Well start by talking about the building blocks of a starter. Images of magnetic contactor wiring diagram book wiring diagram source. Electrical symbols and line diagrams chapter 3 material taken from chapter 3 of electric motor controls, g.
In addition you may wish to complete basics of control components. This video explains the basic concept of contactor and relay. Use safety relay module that conforms to safety category 3 of iso8491 or higher. Digital logic circuits lecture pdf 19p this note covers the following topics. If so the complete contactor needs to be exchanged. Section title page number the contactor 3 knife blade switch 3 manual controller 4 magnetic contactor 5 contactor components 6. The overload relay has no power contacts and cannot disconnect the motor by itself.
Wiring diagram book a1 15 b1 b2 16 18 b3 a2 b1 b3 15 supply voltage 16 18 l m h 2 levels b2 l1 f u 1 460 v f u 2 l2 l3 gnd. The auxiliary contact is often used in a relay logic circuit, or for some other part of the motor control scheme, typically switching 120 volt ac power instead of the. An understanding of many of the concepts covered in basics of electricity is required for basics of plcs. Here i am telling to you how to create relay logic circuit. Sample circuits according to safety categories 52 safety concepts book use emergency stop pushbutton switch s1 that conforms to iec6094755 or iec6094751, iso850.
The manual logic controller also called mlc, is an electronic circuit invented and designed by the author in 2008, in order to replace the well known plc programmable logic controller in. Unit 1 basic principles of motor controls different manufacturers of control devices, as well as books about motor controls, use different methods of showing the control circuit wiring. From the forward push button switch the touch current supply goes to 2nd contactor nc auxiliary contacts and from the auxiliary contacts the wire goes to the first magnetic contactor no auxiliary contacts terminal and coil a2 terminal as shown in the above forward reverse motor control diagram. Electrical symbols and line diagrams university of florida. Plc definition programmable logic controllers plc are often defined as miniature industrial computers that contain hardware and software used to perform control functions. Ive never blown an output running a contactor off of a plc output. Pdf on apr 19, 2016, vladimir gurevich and others published electric relays. Programmable logic controller is an industrially hardened modular computer which.
According to their rating, contactors are classified into the following. In his case, the contactor hes using is a 24vdc coil which has an inrush and sealed rating of 9w 375ma. Manual guidelines for contactor inspection and maintenance. Motor contactor or starter coils are typically designated by the letter m in ladder logic diagrams. In previous chapter relay logic circuit rlc we discussed about relay logic elements which are used in relay logic.
Main contacts to connect and disconnect the load to and from the source of power. A simple circuit diagram either of the two start buttons will close the contactor, either of the stop buttons will open the contactor. Automaticnonautomatic transfer switch, contactor type 3. A louder hum will occur if the shading coil does not apply to af is broken because the magnet will cause the contactor to chatter. We will then conclude with a discussion on starters.
Pdf programmable logic controller plc in automation. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. One contactor may have several auxiliary contacts, either normallyopen or normallyclosed if required. Instead, take a few moments to see if there is an obvious problem. The 3000 a contactor switch is another eaton product which includes the smart. Contactors electromechanical relays electronics textbook.