Generally, these electrical devices feature multiple contacts. The skills they employ take years of development through formal education and onthejob training. A contactor can be operated by electrical, pneumatic or electropneumatic means. A reversing contactor is an assembly of two contactors one for each direction joined by a mechanical andor electrical interlock to ensure only one contactor is energized at a time. How to size a contactor for any application springer controls. Drive contactors type eflg, eh, ehdb drive contactor, general purpose type eg, type aafaetae, and type b contactor these contact sets for asea brown boveri abb motor starters are normal stock for immediate delivery from repco. The work of electricians keeps our lights on, our refrigerators cold and our computers working. The power demands of our modern homes and buildings require the expertise of several types of electrical contractors. A contactor is a relay which is capable of switching large electrical loads contactors and relays are operated by applying a voltage to the coil of an electromagnet, which will cause a switch, or several switches to close. A wide variety of electrical contactor options are available to you, there are 4,886 suppliers who sells electrical contactor on, mainly located in asia. Contactor relays contactor relays contactor relays are often used in control and regulating functions. Electromagnetic contactors are most commonly used to switch on and off in the low voltage part of the electrical power system. The contactor may have arced and welded a contact or all contacts. Use the filters on this page to narrow down your abb iec contactor options or give us a call today at 866 3540063 to discuss your needs.
A contactor is a large relay, usually used to switch current to an electric motor or another highpower load. Manual guidelines for contactor inspection and maintenance. The handsoffauto switch controls the operation of the lighting control contactor. When someone uses a lighting contactor in a motor application, thats a misapplication. Thus, it is more helpful to select a contactor based on the switching needs of the main circuit, and then select a contactor coil based on power supplied by the control circuit. Jul 17, 2017 switch the volt ohmmeter on and to the ohms position on the front selector switch. Contactors are used by electrical equipment that is frequently turned off and on opening and closing the circuit. Should all 3 contacts have welded in, the motor will most likely start the minute you turn power on. Contactors have specific designs for specific purposes. The simplest form of motor starter for the induction motor is the direct on line starter.
A contactor can stand on its own as a power control device, or as part of a starter. The main contacts are the ones where you would have your power connected to the line side and lets say your electric motor to the load side. Contactors are typically used for very heavy duty industrial scale applications and their ratings systems is designed to reflect this. Contactor, iec, 9 amp, 3pole, 24 volt dc electronic coil, 1 normally open, auxiliary contact. The electrodynamic forces during a short circuit can mechanically damage the contactor. The lowest contact is an auxiliary contact which has a current rating much lower than that of the large motor power contacts, but is actuated by the same armature as the power contacts. In addition to the simplicity which they offer in project engineering, panel building. Reading and understanding electrical drawings electrical drawings can represent anything from a singleline power distribution, to a power or control circuit, and are prepared using various symbols for electrical devices and their interconnections with lines representing conductors or wires used for interconnections. Figure 1 electrical contactor figure 2 plugin relay. Electrical contactors, as shown in figure 1, are switches that are turned on and off with electrical power rather than with the direct push of a button or flipping a toggle switch. Three contactor systems are often specified with a three position selector switch vfdtestbypass. For example, for ac coil voltages we have 24v, 120v, 208240v, or 480v contactor coils available, and for dc coil voltages we have 24v or 110v coils.
A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings. If the seriesconnected heaters get too hot from excessive current, the normallyclosed overload contact will open. To read and understand electrical drawings, it is necessary to know the. Economiser circuits are used to reduce the power consumed by the contactor during its operation. Maintenance should be limited to inspection of the contacts for the level of contact wear. The contact part of the contactor includes the power contacts as well as the auxiliary contacts. They come in different classifications under iec 6094741. Allenbradley 100c09ej10 contactor, iec, 9a, 3p, 24vdc. Select appropriate control voltage before attaching wiring.
Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts. Place the red lead into the ohm connector and the black lead into the common. Contactors electromechanical relays electronics textbook. A contactor is a switching device, having one stable position, operated otherwise than by hand. The universal coils are the ones that can operate on ac as well as dc voltages. The skills they employ take years of development through. The power contacts gains the power for the contactor and the auxiliary contacts is used to bring a loop with the rest of the rest of the devices it is attached to. Contactors and contactor assemblies digital asset management.
Oct 23, 2017 another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. Contactors and relays 5 5 contactor relays contactor relays contactor relays are often used in control and regulating functions. Abb controls offers one of the widest arrays of products to help start and protect electric motors. Abbs af contactors feature block type design and include an electronic coil. I dimensions in mm fix on a plain surface with two m5 screws, max. Place the red lead to the l1 and the black lead to t1. Abb two contactor bypass systems can perform all three modes of operation without the three position switch, third contactor and associated wiring. Codigo 2 21e 11 1 1 macn211at 100999 2 12e 02 0 2 macn202at 100998 22020marn220at 100994 21111marn211at 100993 20202marn202at 100992 4 41e 31 3 1 macn431at 100997 4 32e 22 2 2 macn422at 100996 1. High current can be either due to overload or due to shortcircuit. The basics of contactors commercial electric products. For all intent purposes, a contactor is a relay, as shown in figure 2. This is to ensure a trouble free operation of the contactor until the next service is required see next section interpreting levels of electrical contact wear. A small amount of power is drained by the contactor coil during its operation.
Vfd mode and bypass mode, as they imply, power the motor through one of the two parallel paths. Contactor 3ts49, 3ts50 operating instructions english din vde 0660, iec 6094741, q320500 sms 009, gb14048. These classifications are expressed as ac numbers, from ac. Contactors are used in applications ranging from the light switch to the most complex, automated industrial equipment. Abb 4pole across the line contactors are designed for controlling power circuits up to 690 vac and 220 vdc. These contacts are in most cases normally open and provide operating power to the load when the. White paper on different types of relays the relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits.
Contactors and relays contactor relays moeller wiring manual 0208 53 5 the system and the standard european standard en 50011 terminal markings, reference numbers and reference letters for certain contactor relays has a direct bearing on the use and application of the modular system. Ac contactor operating coil nominal voltage ac 36v, 110v, 220v, 380v, 660v, dc 24v, 110v, 220v and other, for general use, many people think that the selection of 220v operating coil or a choice of 380v operating coil seemed merely conform to the original habit and control circuit, the. Electrical contactor maintenance this task covers inspection and repair. The direct on line motor starter dol consist a mccb or circuit breaker, contactor and an overload relay for protection. Some of the common reasons are excess current flowing through the contacts.
If it welded one contact, it means you will have power to one set of the motor winding the minute power is turned on. This item is obsolete and no longer available for purchase. When selecting contactors, youll use one of two common standards. C contactor a threephase starter b singlephase starter type 25 nonreversing contactors and starters c306 27 nonreversing starters xtob 30 nonreversing starters c440 eol 65 reversing contactors c 2 5 d n a 2 1 5 a a 1 6 1 8 4 contactor frame size a compact, singlepole b compact, twopole c compact, singlepole w. The following contactor series are supplied by repco. Ratings of a contactor are given according to the pole of the contactor. It also depends on factors like fault withstand current, coil voltage and so on. In process industries, a contactor is a vessel where two streams interact, for example, air and liquid. Thus, it is more helpful to select a contactor based on the switching needs of the main circuit, and then select a contactor. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. The contactors are designed for operation on a vertical mounting surface. Guidelines for contactor inspection and maintenance abb aafline. Together with some additional elements such as timedelay relays or overcurrent devices, they often perform the protective and controlling function of appliances, or the starting. In addition to the simplicity which they offer in project engineering, panel building, commissioning and maintenance, the high.
The rated currents of these devices range from a few amperes to 200 a. They are used in large quantities for the indirect control of motors, valves, clutches and heating equipment. Electrical contacting to the contactors by means of coil pick off. Control contactor maintenance manual ripley lighting controls.
Below is another electrical interlocking control circuit diagram. The top three contacts switch the respective phases of the incoming 3phase ac power, typically at least 480 volts for motors 1 horsepower or greater. It is an important building block in industrial automation. Definite purpose contactors, electronic overloads, enclosed manual motor starters and other contactor accessories are also available. Our team is quick and responsive, and we can ship many parts to you the same day that you order them. They typically are used with 3phase motors, noninductive or slightly inductive loads. Control contactor maintenance manual ripley lighting. These contacts are rated to carry relatively high current and it is important that you use the correct rating contactor that matches the rating of the motor. Usually, the reason for contactor failure is misapplication. Contactors, overloads and manual motor starters carlo gavazzi. These classifications are expressed as ac numbers, from ac1 to ac4. Removal note discard and replace all lockwashers and locknuts when removed. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. 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.
If so the complete contactor needs to be exchanged. Perhaps the most common industrial use for contactors is the control of electric motors. The same is true when someone uses a normal operation motor contactor for motor jogging duty. In semiconductor testing, contactor can also refer to the specialized socket that connects the device under test. These contacts are connected to the contact springs. Answer baljeet singh the contactor means the contact to make or break the circuit with useful protection. Search wegcontactoresyrelesdesobrecarga50036562catalogoespanol. According to their rating, contactors are classified into the following. Contactor definition and meaning collins english dictionary. Whether you need an across the line starter, a soft starter, an overload relay, or a manual motor protector, youll find it in our huge inventory of abb motor starters and contactors. The picture below represents a multivolt application lighting control contactor. Another cause read more commmon reasons for contactor failure.
Three phase induction motors runs with two speeds 1 direction and two speeds two directions motor control and induction motors reverse forward operation is the types of electrical interlocking. Troubleshooting common electrical contact problems pep brainin. A contactor is an electricallycontrolled switch used for switching. The hand position forces the control contactor to pull in or on. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. Maximum backup fuse for shortcircuit protection gl and gg. Thats why you need to understand the basics of contactors. Abb dp40c3p2 40a, 3p, definite purpose contactor 40 amp, 3pole, definite purpose contactor, 600v rated, lug terminals, 208240v ac coil. Commmon reasons for contactor failure electrotechnik. Hum can also occur if the pole surfaces are deformed.