The power demands of our modern homes and buildings require the expertise of several types of electrical contractors. A contactor can be operated by electrical, pneumatic or electropneumatic means. Oct 23, 2017 another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. They come in different classifications under iec 6094741. Electrical contactor maintenance this task covers inspection and repair. How to size a contactor for any application springer controls. 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. Place the red lead to the l1 and the black lead to t1. These classifications are expressed as ac numbers, from ac1 to ac4. Contactors are used in applications ranging from the light switch to the most complex, automated industrial equipment. Electromagnetic contactors are most commonly used to switch on and off in the low voltage part of the electrical power system. Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts. For all intent purposes, a contactor is a relay, as shown in figure 2.
Allenbradley 100c09ej10 contactor, iec, 9a, 3p, 24vdc. The contactor may have arced and welded a contact or all contacts. I dimensions in mm fix on a plain surface with two m5 screws, max. Contactor 3ts49, 3ts50 operating instructions english din vde 0660, iec 6094741, q320500 sms 009, gb14048. Electrical contacting to the contactors by means of coil pick off. 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.
A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings. Electromagnetic contactor which can be opened by the thermal overload relay under fault conditions. Abb 4pole across the line contactors are designed for controlling power circuits up to 690 vac and 220 vdc. 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. It is an important building block in industrial automation.
Should all 3 contacts have welded in, the motor will most likely start the minute you turn power on. 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. In semiconductor testing, contactor can also refer to the specialized socket that connects the device under test. The skills they employ take years of development through. 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. Maintenance should be limited to inspection of the contacts for the level of contact wear. In process industries, a contactor is a vessel where two streams interact, for example, air and liquid. The universal coils are the ones that can operate on ac as well as dc voltages. The contactors are designed for operation on a vertical mounting surface. Contactors electromechanical relays electronics textbook. 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. The work of electricians keeps our lights on, our refrigerators cold and our computers working.
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. Contactor relays contactor relays contactor relays are often used in control and regulating functions. Vfd mode and bypass mode, as they imply, power the motor through one of the two parallel paths. 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. The same is true when someone uses a normal operation motor contactor for motor jogging duty. Generally, these electrical devices feature multiple contacts. According to their rating, contactors are classified into the following. These contacts are in most cases normally open and provide operating power to the load when the. Commmon reasons for contactor failure electrotechnik. Economiser circuits are used to reduce the power consumed by the contactor during its operation.
It also depends on factors like fault withstand current, coil voltage and so on. Contactors are typically used for very heavy duty industrial scale applications and their ratings systems is designed to reflect this. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. The direct on line motor starter dol consist a mccb or circuit breaker, contactor and an overload relay for protection.
Control contactor maintenance manual ripley lighting. The simplest form of motor starter for the induction motor is the direct on line starter. The hand position forces the control contactor to pull in or on. 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. A contactor is an electricallycontrolled switch used for switching. Definite purpose contactors, electronic overloads, enclosed manual motor starters and other contactor accessories are also available. In addition to the simplicity which they offer in project engineering, panel building, commissioning and maintenance, the high. When selecting contactors, youll use one of two common standards. 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. Abbs af contactors feature block type design and include an electronic coil.
These contacts are connected to the contact springs. Contactor, iec, 9 amp, 3pole, 24 volt dc electronic coil, 1 normally open, auxiliary contact. 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. When someone uses a lighting contactor in a motor application, thats a misapplication. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. In addition to the simplicity which they offer in project engineering, panel building. Hum can also occur if the pole surfaces are deformed. A contactor is a switching device, having one stable position, operated otherwise than by hand. Troubleshooting common electrical contact problems pep brainin. Guidelines for contactor inspection and maintenance abb aafline.
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. Ratings of a contactor are given according to the pole of the contactor. The contact part of the contactor includes the power contacts as well as the auxiliary contacts. 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. If it welded one contact, it means you will have power to one set of the motor winding the minute power is turned on. If the seriesconnected heaters get too hot from excessive current, the normallyclosed overload contact will open. 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. Another cause read more commmon reasons for contactor failure. 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. Abb controls offers one of the widest arrays of products to help start and protect electric motors.
The rated currents of these devices range from a few amperes to 200 a. They typically are used with 3phase motors, noninductive or slightly inductive loads. 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. Search wegcontactoresyrelesdesobrecarga50036562catalogoespanol. Below is another electrical interlocking control circuit diagram. 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. High current can be either due to overload or due to shortcircuit. To read and understand electrical drawings, it is necessary to know the.
Abb two contactor bypass systems can perform all three modes of operation without the three position switch, third contactor and associated wiring. The following contactor series are supplied by repco. Maximum backup fuse for shortcircuit protection gl and gg. Answer baljeet singh the contactor means the contact to make or break the circuit with useful protection. Control contactor maintenance manual ripley lighting controls. The electrodynamic forces during a short circuit can mechanically damage the contactor.
Manual guidelines for contactor inspection and maintenance. Some of the common reasons are excess current flowing through the contacts. A contactor is controlled by a circuit which has a much lower power level than the switched circuit. 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.
A contactor can stand on its own as a power control device, or as part of a starter. If so the complete contactor needs to be exchanged. Contactors and contactor assemblies digital asset management. Our team is quick and responsive, and we can ship many parts to you the same day that you order them. A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings. Removal note discard and replace all lockwashers and locknuts when removed. 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. The picture below represents a multivolt application lighting control contactor.
Contactors and relays 5 5 contactor relays contactor relays contactor relays are often used in control and regulating functions. The skills they employ take years of development through formal education and onthejob training. 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.
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. A contactor is a large relay, usually used to switch current to an electric motor or another highpower load. Select appropriate control voltage before attaching wiring. Thats why you need to understand the basics of contactors. Place the red lead into the ohm connector and the black lead into the common. These classifications are expressed as ac numbers, from ac. Figure 1 electrical contactor figure 2 plugin relay. Contactor definition and meaning collins english dictionary. This item is obsolete and no longer available for purchase. Perhaps the most common industrial use for contactors is the control of electric motors. 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.
Three contactor systems are often specified with a three position selector switch vfdtestbypass. 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 have specific designs for specific purposes. The handsoffauto switch controls the operation of the lighting control contactor. The basics of contactors commercial electric products. Usually, the reason for contactor failure is misapplication. 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.178 393 1147 370 210 490 261 103 847 102 287 63 1026 998 470 494 1069 1339 1163 1191 1412 64 1245 332 507 1038 956 60 554 1424 1463 1273 981 389 1215 859 688 104 640 695 774 888 1368 1345