Contactors (Full Lecture)

Рет қаралды 208,859

Күн бұрын

In this lesson we'll introduce the contactor, the principal interaction point between the control and power aspect of an electrically controlled system using motors. We'll learn to identify the power contacts, the coil, and auxiliary contacts on both the schematic and representative examples and discuss the purposes and function of each. Additionally, we'll discuss auxiliary contact blocks, armatures, contact carriers, shading coils, mechanical interlocks, and coil and contactor specifications and construction, utilization categories and sizing, means of extinguishing arcs, and contrast general purpose electrically held contactors with mechanically held contactors and solid state contactors.
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For more FREE online technical training check out the following playlists available at the bigbadtech channel:
DC Circuit Analysis • DC Circuit Analysis
Single Phase AC Circuit Analysis • Single Phase AC Circui...
3 Phase AC Circuit Analysis • 3 Phase AC Circuit Ana...
Hydraulics • Hydraulics and Electri...
Pneumatics • Pneumatics
Motor Control • Motor Control
Motors and Generators • Motors and Generators
Motor Drives/Variable Frequency Drives (VFD) • Motor Drives
Programmable Logic Controllers (PLCs) • Programmable Logic Con...

Пікірлер: 95

@daveburns1029 4 жыл бұрын

Makes me realize just how much I was taught and had forgotten over 40 years in industry

@eepower 6 жыл бұрын

Great well represented lecture. Well done and thanks for sharing the knowledge. I personally appreciated it.

@rob8823 Жыл бұрын

Great video. Side note, many trades will hardly ever come across a contactor with a higher coil/control voltage, but they are common. Often the coils can be swapped for whatever you need in either ac or dc voltages. 24 up to 220dc and 24 up to 480ac. Thanks for all your well made videos!

@brianburke396 6 жыл бұрын

Excellent, any of your posts are informative and easy to follow, well explained and executed,, 10 out of 10. Keep up the good work, looking forward to seeing more of your posts, top job

@ToutePuissance 4 жыл бұрын

Thank you, I’ve learned so much from your lectures. Job well done!

@justicemugwena3842 2 жыл бұрын

This is awesome , more professional and more scientific. I learned a lot. thanks, thanks and thanks.

@Okie-Tom 2 жыл бұрын

Thank you! I especially enjoyed learning about the auxiliary contacts! Tom

@emmanuelkazadi492 8 жыл бұрын

So much useful information to grasp. watched the video once I think am gonna need to watch it trice for everything to sink in. Thank you for your work!

@estherakotomoo6106 6 жыл бұрын

emmanuel kazadi c.f.

@javierferrer4634 3 жыл бұрын

Nice video! I'm going to watch it few times, to get familiar with contactors because I'm operator but I like to solve problems and learn. Thank you for your sharing your knowledge.

@engrsyedowaisathar5556 6 жыл бұрын

excellent video ... well explained without wating time ... Good Job done

@workwillfreeyou 6 жыл бұрын

Exceptionally well done! Thanks Jim.

@billarroo1 6 жыл бұрын

Lots of useful information, thanks.

@netshahab 5 жыл бұрын

Solid lecture, Bravo!

@stuffoflardohfortheloveof 3 жыл бұрын

Brill! Thanks very much for posting this 👍

@electricengineer624 5 жыл бұрын

Awesome presentation Love it Lots of new infos God bless you bro

@javierferrer4634 5 жыл бұрын

Thank you! I appreciate this video is very helpful.

@3333gallo 6 жыл бұрын

Great job! Very useful.

@ganeshshinghthakuri 4 жыл бұрын

Great well represented lecture. thanks for sharing the knowledge. I personally appreciated it. Please make videos of DC motor control panel and it's fault how to fix.

@ibbriley399 Жыл бұрын

This lesson should be prerequisite viewing for so called hvac controls experts who offer usually flawed contactor videos from this forum.

@nandutzu 5 жыл бұрын

Thank you! Happy new year!

@500aldair 6 жыл бұрын

Thank you for your work!

@JulesBartow 7 жыл бұрын

Here's what I'm going to tell you, tell me, and this is what I told you. Classic --maintained my interest and attention.

@avanthiboshetti7752 5 жыл бұрын

Very clear explanation Thank you

@magendiranmanoharan2780 Жыл бұрын

Great video, thank you

@jeremymcdonald5281 2 жыл бұрын

Very good information.. thank you!

@stanleykania7184 4 жыл бұрын

Your channel is amazing

@sabastianoguti7066 3 жыл бұрын

thank you Mr. for the lesson

@gazpromcoopers6515 4 жыл бұрын

The idea i needed enshrined in the contest

@katuraysalad 11 ай бұрын

Thank you for this great video

@wouldntchuliketoknow8170 4 жыл бұрын

Excellent explanation. I would just like to say that contactors are used in many more places then just motor control systems. Street lighting is a simple system that incorporates contactors and a photo cell to automate the system.

@bigbadtech 4 жыл бұрын

True dat. Anything driven by primary voltage (motors, heaters, lights, etc.) often uses a contactor to make or break connection.

@Pepe__7 5 жыл бұрын

Cool video, can you explain liquid line solenoids.

@gensyed 4 жыл бұрын

very professional. Thank you.

@shannonsloan7246 5 жыл бұрын

Yes sir, are brilliant!

@elioselectric468 4 жыл бұрын

Very good thanks

@Obzrve Жыл бұрын

Thanks man

@twoshooz3365 5 жыл бұрын

You are the ken burns of electrical lectures

@bigbadtech 4 жыл бұрын

I personally feel my lectures have the production quality of an old Bananarama music video.

@twoshooz3365 4 жыл бұрын

That aside. They are easy to understand and relaxing. I walk away feeling educated.

@bernardoprovenzanno3142 5 жыл бұрын

Grt detailed ..whatever happened to J.J on Good Times???

@nathanielreid4967 6 жыл бұрын

Thanks

@raffaelerimorso9671 5 жыл бұрын

big project, lezion

@vkdukare 6 жыл бұрын

Very detailed ....

@engineeringmaniac9696 3 жыл бұрын

Thank you

@Richardo7172 Жыл бұрын

Jim, looking at the auxiliary switch at 9:35, is there a rule that dictates the contacts arrangement....meaning, you have two NC followed by two NO. Couldnt we have different arrangements, example alternating contacts NC,NO,NC,NO.

@bigbadtech Жыл бұрын

Yes, some switches are entirely customizable with mix and match contact blocks.

@vuurovengkongmene6422 2 жыл бұрын

Very good job I'm electrical machine rewinder

@bigbadtech 2 жыл бұрын

Very nice! You can make fun of all the chintzy diagrams I used in these lectures: kzfaq.info/get/bejne/nttnntqfzMm2coE.html kzfaq.info/get/bejne/meCgZNV-0bepiok.html You know the truth!

@antipolicia1 3 жыл бұрын

Love the lectures and great contents. I would like to know how did you come up with the 18s trip time of 4 time x 3A= 12A on 20s/6x. Not really sure how did you get there thanks

@bigbadtech 3 жыл бұрын

Are you referring to the overloads lecture? If so a chart shows the trip time at various current magnitudes in excess of the rated current.

@antipolicia1 3 жыл бұрын

@@bigbadtech thanks for the response, I just miss that. I understand right now.

@DorinMocan 6 жыл бұрын

but the power for A1-A2 can be 230V A.C. also

@user-xv1mz9le5p 4 жыл бұрын

If i have a 4 pole 20A contactor but i need 40A for normal AC, is it safe to wire a 4 pole contactor using 1 and 3 together for the Live wire and 5 and 7 for the other wire or will it be a problem because the poles maybe connects 1 ms different?

@bigbadtech 4 жыл бұрын

We are entering the "code zone" which I do not have experience nor the authority to interpret. Check with your authority having jurisdiction. Theoretically current should equally divide between two paths of equal resistance.

@nickfleming3719 5 жыл бұрын

Less tiny stationary pictures, more videos or at least bigger pictures with arrows or circles to indicate what you're talking about

@redfreckle2044 6 жыл бұрын

If the OL on a starter trips will it deenergize the aux contactor on it even if there is a secondary path to complete the circuit without passing though a1/a2?

@bigbadtech 6 жыл бұрын

Check out the 3 wire magnetic motor starter lecture at: kzfaq.info/get/bejne/odhni8yCnZrWlKM.html

@redfreckle2044 6 жыл бұрын

Jim Pytel sorry I might have missed the answer but the examples in the lecture appear to only show a series circuit where an OL will clearly deenergize the holding contacts. I have a line in parallel with with A1/A2 which could allow for the holding contact fixed to the same DOL to remain energized assuming the OL is only breaking the connection of A1/A2. But if the OL 95/96 causes the whole DOL to deenergize it would reopen the contact 3/4 and the entire circuit would be open. My instructor seems to have some confusion on this point.

@bigbadtech 6 жыл бұрын

Not totally following the description, however, anytime the examples in the aforementioned lecture experience an overload condition the series NC OL would deenergize the coil of the contactor. Here's the important part ... anytime the contactor coil is deenergized it's associated contacts (ie: the 13 14 NO auxiliary) would also return to their deactivated state (ie: open) and remove the holding circuit. The state of the contactor primary contacts and auxiliary contacts are both dictated by the state of that contactor's coil. Hope this makes sense. Ideally the NC OL is only in series, thereby effectively giving it the "last say" whether the motor is energized or not.

@redfreckle2044 6 жыл бұрын

Jim Pytel Sorry, I wish posting images to yt comments was a thing... or maybe not. Yes that makes sense and is what I thought was the case. Thanks so much for your help! I might ask for more but I think KZfaq law dictates that I need to start paying you after two responses. Thanks again and take care!

@bigbadtech 6 жыл бұрын

Look up my school email address. Send me a shot of what you're talking about.

@nyustdent 3 жыл бұрын

Jim, im confused about WET and dry contacts. There is a lot of confusing videos on wet contacts and it seems some professionals dont believe the term is accurate. What is a wetting voltage and what exactly is a wet contact? dry contacts close a circuit and one or the other side supplies the voltage so what exactly does a wetting voltage do? thanks

@bigbadtech 3 жыл бұрын

Excellent question. I should actually address this difference in upcoming sensors and control lectures I've got planned.(As well as untangle the difference between "sourcing" and "sinking" inputs and outputs ... I am dreading this task). Without complicating it too much I like to think of "dry" as meaning isolated inputs and outputs. ie: some input is triggered and a separate output source provides power, whereas "wet" means the triggering of input means this input also provides power. It's hard to describe without diagrams. Control has a great article on this subject: control.com/technical-articles/the-difference-between-wet-and-dry-contacts/ When I publish the photo electric switches lecture I'll try to differentiate between wet and dry contacts.

@nyustdent 3 жыл бұрын

@@bigbadtech thanks for the quick response! really enjoy your lectures and something that i'll be sharing with others since it's so helpful . One weird issue with engineering graduates is that many dont have enough experience with the hands-on accept of understand relays,contactors and other control circuiry. Some cant even follow a simple circuit unless it looks like those in circuits 1 and 2. Nothing too hard but it takes a bit of study. anyway thanks and i'll be on the look out for your videos on this wetting contacts

@mohibs83 Жыл бұрын

what is Fluke model ?

@mikeadler434 Жыл бұрын

👍👍

@sahabatlistrik2447 2 жыл бұрын

I need to know when a 3 phases contactor is used for one phase load.(onephase-oneneutral) flowing at its contact. How to calculate its power capacity that used for switching a lighting load? Thanks.

@bigbadtech 2 жыл бұрын

Look it up on the data sheet for the contactor of interest.

@sahabatlistrik2447 2 жыл бұрын

@@bigbadtech nice thanks. 🙏

@altuber99_athlete 2 жыл бұрын

Even though contactors don’t have sensing elements, they can be commanded to interrupt on-load currents. But can they also safely interrupt overload currents? Can they also interrupt short-circuit currents?

@bigbadtech 2 жыл бұрын

A contactor is just one half of a motor starter. For information on the other half check out the overload relays lecture at: kzfaq.info/get/bejne/ocCdptFy19yyYYE.html

@altuber99_athlete 2 жыл бұрын

@@bigbadtech Thanks! So, contactors can interrupt overload currents by being triggered from an overload thermal relay. But contactors can’t interrupt short-circuit currents. Right?

@bigbadtech 2 жыл бұрын

True dat. Over current protection is traditionally reserved for circuit breakers and/or motor starters in series.

@harip9159 2 жыл бұрын

HOW TO SELECT SIZING OF CONTACTORS FOR DIFFERENT TYPES OF STARTING& DIFFERENT HP OF MOTORS.EXPLAIN MODEL CALCUTIONS.ALSO REFERENCE BOOK ALSO REQUIRED.

@coolezakzak7295 4 жыл бұрын

so if you close i3-i4 does L1-T1 and L2-T2 and L3 - T3 close too

@bigbadtech 4 жыл бұрын

Unless the contactor is broken every contact, primary or pilot, will simultaneously change states based upon: the energized/deenergized status of the coil or the activated/deactivated state of the manual override.

@coolezakzak7295 4 жыл бұрын

what is the difference between the 2 contactors at 6:55

@bigbadtech 4 жыл бұрын

No physical difference. Just a different style of schematic drawing you may see one day.

@michaelcostello6991 7 жыл бұрын

More Diagrams would have been helpful

@Hayatikavak1969 3 жыл бұрын

Tenks Cim

@Hayatikavak1969 3 жыл бұрын

Thanks

@mustafizurrahmansihab8271 3 жыл бұрын

total topic in a summary

@coolezakzak7295 4 жыл бұрын

10:45 why do you begin with 21-22 not with 11-12 31-32 21-22 43-44 33-34 53-54 43-44

@bigbadtech 4 жыл бұрын

Contactors typically include a NO contact numbered 13-14. Therefore the auxiliary contact block starts at 2.

@kibacademy9619 2 жыл бұрын

You are very fast.. Do you have notes!

@bigbadtech 2 жыл бұрын

That's why folks love the playback speed button on KZfaq. Slow it down if I'm too fast. Speed it up if I'm too slow. Unfortunately I haven't published the study guides for motor control yet. This being said I do have a bunch of study guides for the basic electrical circuit analysis series and hydraulics at the following links: openoregon.pressbooks.pub/electronics1/ openoregon.pressbooks.pub/electronics2/ openoregon.pressbooks.pub/electronics3/ openoregon.pressbooks.pub/hydraulics/