Basic Motor Control: 3 wire Start Stop Circuit

Comments · 530

• KT

  @ktoectbkto · 5 years ago (edited) · pinned

  This is the best video I have ever seen with a thorough explanation of the circuit especially if you are a self learner as I am. Eleven minutes of this video equals to weeks of learning in schoool. Good job sir, keep those videos on rolling out!!!

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• GA

  @garza1367 · 3 years ago

  6 weeks of motor controls class summed up in 11 minutes. Great, simple, effective content.

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• BA

  @Baron_Bleeke · 1 year ago

  I was a commercial construction electrician for 20yrs, and I always felt that MC was over my head. Coworkers tried to explain it to me but I could never get a grasp on it. Five years after I left the trade, I tried to teach myself PLC programming as a new career. A start/stop ckt with a latching contactor was one of the first lessons, and it made perfect sense to me. Huh, I had no idea that's what motor control was!

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• GA

  @garysackrider529 · 4 years ago

  I've been doing electrical for 25 years and just now start doing motor controls and this really helped me out a lot thank you

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• D.

  @D.Hozzie · 6 years ago

  Hey Walter.  I have been “ one of those electricians “ for a long time. The MC aspect has kind of stopped me in my tracks quite often. I work for a zoo and so my duties as an electrician can vary greatly.  Thank you for this and “ sparking” my interest with bettering myself. Good things!

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• SM

  @SmiTTyy-sh8nc · 6 years ago

  "Latch circuit" That term helped me remember that using a N.O. Aux. contact keeps the circuit energized after pushed. Great explanation  video !!

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• PA

  @patrickgreen9486 · 5 months ago

  The more I have watched this video, the more I have learned, you are a great teacher...

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• SH

  @SH-pc4xt · 6 years ago

  Thanks so much for this video, and the entire series!! &nbsp;Just a hobbiest, but am installing CNC mill and manual lathe in home shop. Came to these videos based on VFD intro videos, stayed to watch these basic tutorials on motor control. Last year I had 2 electricians helping me to troubleshoot a 20 yo but &quot;brand new, unused&quot; 18&quot; bandsaw. Couldn&apos;t get it to start even though all the switches seemed fine. I finally discovered that by manually closing the contractor, the motor would start, thus eliminating the motor as &quot;the problem.&quot; I used a volt/ohm meter to verify that power was making it to the motor control inputs, and that the basic control switches were working as intended. I went so far as purchasing a replacement control unit from Amazon but then I was stuck. <br>The second electrician was brought in at this point. He was able to diagnose the problem with the original motor control unit (from ~1988)--the primary relay coil had break somewhere so it would not energize. The contractor units have been standardized for decades, so the second electrician (the &apos;motor-control whisperer&apos;) as able to harvest the coil unit from the Amazon replacement and use it in place of the original unit. Everything just snapped together and now the unit operates properly with it&apos;s original control switches and front panel intact. While this was a great result I don&apos;t like to think about how much all that cost (lets just say a few hundred dollars). &nbsp;Having watched these intro videos on Motor Control and 3-wire start/stop circuit basics, I could now understand better how it was all working (or not working). Don&apos;t know that I would have figured out what the problem was, but at least I would have had a chance.<br>Finally, I&apos;m going to keep watching this series because, for example, I may want to add an additional stop switch to the bandsaw. The red momentary NC switch assemblies are readily available on Amazon. From these videos, I think I understand how to add more to make the machine safer to use with a more accessible STOP switch.

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• BO

  @BobbaFett312 · 3 years ago

  sir, i work in power industry and this is one of the best videos out there, liked and subbed

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• PM

  @pmdiamond · 3 years ago

  Excellent video. Thank you. Troubleshooting 3 phase 480v. I love it. Just today, had one phase open, after following conduit, found a bent 3\4 piece of EMT and a burn spot. Friday the guys changed a screen on the El Jay shaker, evidently when they dropped the screen over the side onto the ground they hit the conduit for the feed conveyor. So, overload tripped out from single phasing. Used a tubing cutter, on EMT and added a box a new seal tight. Reset overload and it&apos;s up and running again. Boys were clueless they even hit it.

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• TE

  @tedkiser2626 · 5 years ago

  Absolutely the best and clearest description of a motor starter that I&apos;ve seen. &nbsp;Thanks

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• BN

  @bndwoodlands775 · 4 years ago

  Great job! &nbsp;First and only video I have seen where the narrator explains the seal in contact correctly, ie it is an auxiliary contact and not just some random normally open contact somewhere.

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