This video walks you through the basic 2 wire and 3 wire control for 3 Phase motor controllers Interested in learning Siemens TIA Portal PLC Programming? I have a full Course available for purchase here: petevree.thinkific.com/course...
I’ve been in electrical industry for 20 years, a master electrician and educator. The videos you have created are among the best I have seen at no cost. Much needed to help the novice who won’t spend the money for licensed professionals or training. Giving the average person the ability to learn safely. I subscribed and use your training videos myself. Great stuff. The only thing I would recommend is training on 120v coils with control transformers involved more as that is the most common go to in field applications.
Got your email regarding Drives Training. You may want to check out Yaskawa's new online training: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--DOV5zXSKc8.html
I'm a 4th year apprentice in the IBEW. And I just got out of motor control classes a month ago. After watching this. Everything just suddenly clicked and it made sense. Thank you!
Great video. First time i have truly understood 2 wire and 3 wire. You are very thorough showing all the stages including showing the route of the actual cables at the end. Sincere thanks
What a great! Way of teaching very very well explained & mostly I like how you go drawing a electrical diagram & that's where I still struggle, reading schematics, so please continue your great teaching. Thank very much
Fantastic Video!! Super clear and precise!! I am in a motors class for 3 phase right now, but all the instructor does is tell old war stories, so I've learned a lot from youtube vids, then take questions to him to confirm correct answers. This is one of the Best AND Most Informative I've seen. Thanks again!!!
Hello Pete! Your clear and descriptive approach simplified and explained a lot. Thanks for providing your time and knowledge! Teaching like this, I believe, would enable anyone with the confidence to take on any electrical project.
I'd like to extend a personal thank you. I'm in my 2nd year of trade school and never touched a motor starter in my life. This helped immensely in my labs. So clear and concise. You're the man Pete
Typically control voltages are 120vac ,24vac, or 24vdc. The lower voltages are preferred because of availability, safety, and durability of the control components. If you use high voltage control components such as 480 or 600 volts, the coil windings are such a fine gauge that they are more difficult to manufacture. And they tend to break easily. 24vdc is typically used with PLC.s. 24vac is typically used with HVAC systems. And 120vac is used because it's the standard voltage throughout North America.
Wouldn't L1 & L2 first feed a control transformer because control devices aren't normally rated at the voltage that the coils for motors and disconnects are rated for?
nice videos, I'm taking level 2 hvac and was wondering if you knew of any links to help learn how to make schematics? we are taking a paragraph of information about a control and load circuit and told to make a schematic and wiring diagram from this information?
Only problem with this example is that you always draw the OL contacts at the end of the of the one line diagram not at the beginning (past the motor coil)Look at any motor starter its got numbers 1,2,3 these represent the same 1,2,3 on the one line diagram if you start with the OL you screw that entire system up.Again … that's why its clear that it is an industry standard to draw the OL at the end of the ckt !!!Other wise its a pretty concise and accurate video !!
There is a new standard from IEC that the overloads are to be placed at the beginning of the motor control circuit. The system of having the 2,3 contacts matching the normally open overload is often dismissed as the number 1 is often used as the feed, 2 as the return.
Pete Vree That does Not apply in any control circuit using NEMA devices - And if your outside the US I could maybe see using the IEC standard but here in the USA 🇺🇸 the NEMA standard is still followed in every diagram application and device currently produced or available. Not to mention naming the rails 1 and 2 only applies to PLC applications not relay logic. At least not in any commercial or industrial application
+Peter Brown I just arbitrarily chose L1 and L2. As long as your controls components were rated for the same voltage as your motor circuit, any two line conductors will have the same voltage. i.e. 208V 3 Phase Motor circuit will have 208V Single Phase available between any line terminals.
Javier, I am working on some new videos that walk through the ladder diagram, followed by actual wiring, and finishing up with voltage readings throughout. Have a look and provide feedback. All the best. Pete
Thank you for the information, very helpful. Can you recommend some literature for someone who is looking for more in depth info on this topic? thanks!
Hi Juan, We use this textbook www.amazon.ca/Industrial-Motor-Control-Stephen-Herman/dp/1133691803 However, these two are good as well: www.amazon.ca/Electrical-Motor-Controls-Integrated-Systems/dp/0826912265 www.amazon.com/Electricians-Guide-Motor-Controls-Book/dp/B013HIBQEU If you find anything else that is good, forward it to me and I'll add it to my website: wyedelta.wixsite.com/html_canada-electrical/untitled-masterpage_13 Thanks, Pete
Yes. For this example the overload was located after coil, and the control circuit was fed from the line side of the contactor. (i.e. the control circuit and main motor circuit are fed with the same voltage)
You could have another 2 rungs below with n/c contacts for the red and n/o for the green... or the green could go in parallel with your coil if all you had was one n/o contact that you had already used for the holding contact in parallel with the start pb.
Hello, im not trying to put you on the spot here but your statement at 2:42. I do believe its not the best practice to wire the overloads first due to troubleshooting reasons. But then again if you do work for a big company you can just replace the whole starter with the overloads. I almost forgot my question. lol. Anyways, shouldnt you connect the wire after the coil to Neutral to complete the circuit? Seeing that its a 3phase power connecting it to L2 incoming voltage will only create a direct short? Great video by the way
1. Overload placement is usually after the coil, but some choose to place it first in the rung. 2. Connection to L2 is because the coil is rated for 208 V. The coil itself is the load, so no short will occur. If I connected to neutral, then there would only be 120 V applied to the coil and it most likely would not pull in. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7QCHXXCrU-I.html
Pete Vree i see what youre saying. So when you do have a 120v rated coil and using lets say a stepdown transformer 480 to 120. You would connect it to the neutral side pf the transformer and not from L2 supply voltage. Correct? L2 and Neutral is really confusing me. Ill watch that link ypu posted
im confused about how single phase power generates , does it come from a transformer with 2 coils or 3? are both possible? how does this relate to delta or wye transformers?
Single phase power comes from a 3 phase source. A Wye 3 Phase connection is made, and any line conductor to neutral then provides single phase ex. 120V, and any two line conductors from the 3 phase source provide a single phase voltage at root 3 higher 208V.... or you have a high voltage three phase supply, one conductor is brought to a single phase transformer outside your house, and is transformed to 13,800 V to 120/240V.
I always go from O\L straight to coil on 208v control i never go from O/L through my HOA,S/S,safteys etc then to coil wire the O/L just like with 120v control straight to the coil i dont know everybodys different i guess.
The normally closed contact is in line with the motor contactor. In this case, I chose a 208V supply, so when there is an overload on the motor, this normally closed contact will open, thereby removing the connection to L2. This interruption of current flow through the contactor coil will bring the motor to a stop before the motor coils are burnt out.
Don't use a start and stop ; use a hand off auto switch hand is on/ off it will stop and auto is what ever you want. it's a 2 wire and if you loose power it will start back up
Where is this overload switch physically, why is it nobody shows this swi5ch and how it physically connects in the circuit, is it like a dry set of contacts? Show me the connecting screws....
Terminals 95 and 96 on IEC Overloads as seen here: www.google.com/url?sa=i&url=https%3A%2F%2Fwww.se.com%2Fww%2Fen%2Fproduct-subcategory%2F3060-thermal-overload-relay%2F&psig=AOvVaw2Uya8hZcSLcMDeg7PI-ee2&ust=1595288146371000&source=images&cd=vfe&ved=0CA0QjhxqFwoTCKjY9O292uoCFQAAAAAdAAAAABAL or the contacts shown on the bottom of this NEMA unit with the red wires ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Gy1KrKzer3o.html
