Contactors (Full Lecture)

[@Richardo7172]

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]

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

[@emmanuelkazadi492]

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]

emmanuel kazadi c.f.

[@daveburns1029]

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

[@ToutePuissance]

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

[@brianburke396]

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

[@TheRealEnrique1]

I.cant.stand.his.robot.voice.

[@eepower]

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

[@rob8823]

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!

[@JulesBartow]

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

[@javierferrer4634]

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.

[@Obzrve]

Thanks man

[@justicemugwena3842]

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

[@ibbriley399]

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

[@billarroo1]

Lots of useful information, thanks.

[@engrsyedowaisathar5556]

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

[@mikeadler434]

👍👍

[@stanleykania7184]

Your channel is amazing

[@avanthiboshetti7752]

Very clear explanation Thank you

[@Okie-Tom]

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

[@javierferrer4634]

Thank you! I appreciate this video is very helpful.

[@nickfleming3719]

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

[@electricengineer624]

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

[@ganeshshinghthakuri]

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.

[@vuurovengkongmene6422]

Very good job I'm electrical machine rewinder

[@bigbadtech]

Very nice! You can make fun of all the chintzy diagrams I used in these lectures: kzbin.info/www/bejne/nqaanKqknMiFeK8 kzbin.info/www/bejne/mavTYqWDobZ4kLc You know the truth!

[@katuraysalad]

Thank you for this great video

[@stuffoflardohfortheloveof]

Brill! Thanks very much for posting this 👍

[@bernardoprovenzanno3142]

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

[@3333gallo]

Great job! Very useful.

[@jeremymcdonald5281]

Very good information.. thank you!

[@500aldair]

Thank you for your work!

[@magendiranmanoharan2780]

Great video, thank you

[@mohibs83]

what is Fluke model ?

[@harip9159]

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

[@nandutzu]

Thank you! Happy new year!

[@wouldntchuliketoknow8170]

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]

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

[@netshahab]

Solid lecture, Bravo!

[@DorinMocan]

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

[@sabastianoguti7066]

thank you Mr. for the lesson

[@workwillfreeyou]

Exceptionally well done! Thanks Jim.

[@nathanielreid4967]

Thanks

[@michaelcostello6991]

More Diagrams would have been helpful

[@elioselectric468]

Very good thanks

[@nglistrik]

Thanks

[@engineeringmaniac9696]

Thank you

[@red_freckle]

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]

Check out the 3 wire magnetic motor starter lecture at: kzbin.info/www/bejne/oaOaiZyHbZmlmtE

[@red_freckle]

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]

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.

[@red_freckle]

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 KZbin law dictates that I need to start paying you after two responses. Thanks again and take care!

[@bigbadtech]

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

[@kibacademy9619]

You are very fast.. Do you have notes!

[@bigbadtech]

That's why folks love the playback speed button on KZbin. 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/

[@twoshooz3365]

You are the ken burns of electrical lectures

[@bigbadtech]

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

[@twoshooz3365]

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

[@นกกระทา-ซ4ญ]

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]

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.

[@sahabatlistrik2447]

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]

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

[@sahabatlistrik2447]

@@bigbadtech nice thanks. 🙏

[@altuber99_athlete]

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]

A contactor is just one half of a motor starter. For information on the other half check out the overload relays lecture at: kzbin.info/www/bejne/oYvQpKF3p9uBZ68

[@altuber99_athlete]

@@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]

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

[@rakeshc1790]

.

[@coolezakzak7295]

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]

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

[@nyustdent]

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]

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]

@@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

[@Pepe__7]

Cool video, can you explain liquid line solenoids.

[@gazpromcoopers6515]

The idea i needed enshrined in the contest

[@rocker8692]

i didn't know techs were big and bad lol

[@antipolicia1]

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]

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]

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

[@mustafizurrahmansihab8271]

total topic in a summary

[@coolezakzak7295]

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

[@bigbadtech]

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]

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

[@bigbadtech]

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

[@raffaelerimorso9671]

big project, lezion

[@gensyed]

very professional. Thank you.

[@Hayatikavak1969]

Tenks Cim

[@Hayatikavak1969]

Thanks

[@vkdukare]

Very detailed ....

[@shannonsloan7246]

Yes sir, are brilliant!