Why we use Relay in PLC Applications | Relay Wiring Diagram | Types of Relay-SPST, SPDT, DPST, DPDT
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Read the full blog post at ▶ upmation.com/relay/
Have you ever thought about "why we use relays" or "How to use them"?
As you may know, the relays in the industry are fallen into two main categories. The Solid-State Relays or SSRs and Electromechanical relays or EMRs for short (Are also called mechanical relays or contact relays).
Of course, if you’re an electrician you may face some other types of relays such as safety relays, Power Protection relays, and so on.
You may see Power relays installed on medium voltage panels and they are a type of protection device for power systems. They more resemble a controller than a relay! So, we decided to talk about them in detail in another video.
In this video, you'll first get to know about Electromechanical relays which are the most used types of relays.
Then, you'll see how electric relays work and learn about the relay wiring diagram. After all, we'll answer some questions: What do we use a relay for? How to wire a relay?
We also talk about the combination of normally open and normally closed contacts of the relays which will shape different types of mechanical relays.
Different types of Electromechanical relays are:
SPST relay (Single-Pole Single Throw), SPDT relay (Single-Pole, Double Throw), DPST relay (Double-Pole, Single Throw), and finally DPDT relay (Double-Pole, Double Throw).
👉 To learn about NO and NC contacts ▶ upmation.com/no-and-nc/
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SECTIONS of this video:
0:00 Different types of relays (EMR, SSR, Safety Relays, Power Relays)
1:38 How electromechanical relays work
2:43 Electric relay wiring diagram (for PLC control systems)
4:50 Why do we use relays in PLC circuits?
5:57 Types of relay switches (SPST, SPDT, DPST, DPDT relays)
6:42 Electromechanical relay types and EMR parts
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#Relays #Upmation #Relaywiring
This is really a great channel. I work as PLC and controls Engineer and I recently started designing Electrical Control Panels as well, I am trying to make notes of every aspect in a control panel and luckily Today I found these videos. The topics that are covered here are very useful for a beginner and for a person who wants to know the 'why' and not just how to do something.
Well done guys!
Hi Gurpreet! Thanks for the input and its awesome to hear that! We try to include more practical points about electrical control panels in future videos. Please let us know if you have any other suggestions. Good luck!
Love the why in the details
@@Upmation great video!!! So good!!
How are you doing with your electrical control panels? Are u still there?
I'm so glad to watch such a great and practical video about relays. The tips when using relays is clearly explained! I appreciate that.
Hope that you guys can make videos about sensors, like 2/3/4-wire wiring, single-ended and differential signal, 2/4-wire measurement and so on.
Hey! Thank you very much and you're most welcome! Sure thing! I'll transfer your comment to the team. Thanks!
The technical content and animation , everything is explained and showed perfectly , thank you so much for this amazing videos
You're very welcome, Denny! We're really happy you liked the videos this much. Please stay tuned for more videos.
Thanks for the professional content creation. I love it. Keep it up.
Much appreciated and glad you enjoyed it! We definitely do!
Good day! Thank you for the video! We have been waiting for this day for a very long time and now it has come :)
Hey! Great to read from you again! Thank you! and of course sorry for this pretty long absence. :) Cheers!
Amazing channel, and well done illustrations.
Thank you all.
Thank you and you're very welcome!
SALAM qardas, bi zahmet videolarinizin sayini arttirin izahlariniz superdir, Azerbaycandan SALAM olsun sizlere
thanks upmation you cleared my concept regading use of relays
You're very welcome!
Just Great Explanation
Great. Very useful information that is often skipped over.
Thank you, Michael! Great to hear it was useful.
Thank you for this video! It helped me make sense of it!
You're so welcome! Glad it was helpful!
If you keep making this kind of high quality videos, you'll bring realpars on their knees in no time. Keep it up!
Hey! Thank you very much for your support! Please stay tuned for more.
this is true ,realpars is now having a big match
One of my biggest questions is answered today. Thank you so much for this informative video
Great to hear that! This gives us more passion to pursue our way!
thank you for detailed explanation
You're welcome, Yosepu!
Thanks for uploading the video and again all your explanation is the most I waiting on TH-cam. Pls keep doing this for us.
Hi there! You're very welcome and thank you for your support. Please stay tuned for new videos.
Wow... so simply you described all things. Thanks...😄
You're very welcome! And than you for your support!
This is really a helpful video. Thank you for sharing
You're very welcome, Ringo!
Good stuff with great animated video representation...I love the way your explained clearly...it's simply awesome n wow....👍
Thank you very much, Mohammad!
Very infomative video❤
Here you back again after a long delay !
I believe it was a break to prepare more videos. As a PLC programmer specially on Siemens, i can say that your videos are very well explained and straight forward.
I will be very exited to see your paid video courses (i believe it's on your plan) but i also hope you'll avoid basic things and focus more on practical aspects and real life projects in your paid courses.
The vidoes posted here on TH-cam gives us an idea of what paid courses will looks like.
Keep it up good work Upmation team!
Hey! Finally, we're back again! :) And sorry for this pretty long delay. Yeah! It was something related to COVID19 but we'll continue preparing more videos. It's definitely like what you said. The courses will be more professional-related topics. We're trying to also add some practical and out-of-the-box points to every video, even the simplest subjects. Hope you enjoyed them and thanks for your support.
Awesome videos very informative keep them coming !
Thank you, Martin! Will do for sure.
Excellent explanation.
Glad it was helpful! Please let us know if you have any questions or suggestions.
Thank you for teaching ❤️
You're very welcome! Thank you for watching!
Nice looking great work
Thumbs Up Upmation . Thanks for the knowledge
Emmanuel, thank you for your support and you're very welcome!
Great Great Great....... Amazing Explanation.... Superb.. Great Work.
Hey! Thank you and happy it helped you this much. Please stay tuned and share this video with your friends and colleagues. Thank you!
Many thanks Upmation
You're very welcome, Athil!
Thanks for this content brother
You're welcome, Reza!
Excellent. Thank You.
You're most welcome, Andrea! Thank you for watching!
thanks for video. i enjoy the contents. keep doing this. thank you
You're very welcome! Will do! Please stay tuned!
Very important thing to mention here is that there is a normal, undersized state of the relay that is spring actioned... because some systems need safety and the logic to be NC to ensure that the failsage (failure mode) always shows a signal. But great video!!! Thinking of cars also helps to understand the purpose, ie. Having large wires close to the relay and load while controlled by the relay allows for smaller wires and more dense power circuits ,modularity.
Thank you for the input!
I am excited to watch your channel and waiting for new videos which is more useful for me... thank you so much...your channel is one of the favorite and top rated in my account...thank you so much...
Thank you, Mohammad! Please stay tuned for more videos!
Really good detailed video
Glad you liked it! Happy learning!
Good teacher
Thanks for nice plc really information
You're welcome!
Top notch video with great animation. 👌
Thank you very much, Hiren! Awesome to hear we could help!
Good effort.good and clear message
Great to hear that! :)
Thanks dear..It made my day😃😃very simple language and animation is best to understand👍👍
You're very welcome! :) Happy it helped you!
Weldone team!!!
Thank you, Emmanuel!
It's a great 👍 video well simplified and explain on top of that you shown wiring installation other videos doesn't show and that's important for beginners like me.
Happy it was helpful to you! Please stay tuned for more of these videos.
Ur videos are excellent . Really appreciate it . Could you please make one on hydraulic valve types and explain the working behind them in detail as you already did the pneumatic valves
Thank you for the video with great and comprehensive content.
You're very welcome, Golnaz! Thanks for your support! Please share it with your friends and colleagues to help us grow faster.
Very useful video, thank you so much.
You're very welcome! Thank you for watching!
Very very instructives your videos!!
Glad you think so!
Thank you very much... good quality video
Very welcome! Please let us know if you have any questions or suggestions.
Great video!
Glad you enjoyed it, Mateus!
Very nicely done. Easy to follow and understand each type of relay. Have a question on the DPDT relays however....do you always have to pass the neutrals with each hot? OR can you pass additional hot circuits through if they all share the same location on a neutral bus bar for example?
Thank you and keep up the good work!
Would love to see a similar video on solid state relays. I would love to know why they do the switching when the current is flowing in one direction, but are always on when current is hooked up the other way. ( and why this is, and how to read the really cryptic diagrams on the side to understand it)
Hi, Tim! Thank you for your comment! Please take a look at this video and let us know if it helps you?
How Solid State Relays Work? th-cam.com/video/J0vi5TqqCyw/w-d-xo.html
So wonderful video
Thank you, Mansour! Happy you liked it!
thank you, for this video.
You're very welcome! Thank YOU for watching!
Thanks for sharing .
You're very welcome!
Your videos are far better than realpars..Keep it up buddy..💐
Thank you very much, Sarang! We'll do! Please stay tuned for more and share the videos with your friends and colleagues to help us grow faster. Thank you!
You explained very well 🤩 please make more videos on Siemens PLC , SCADA
Thank you, Hermant! Sure thing! Stay tuned for more videos.
@@Upmation yes sir
Thx for u content
You're welcome! Please stay tuned for more.
Hi, my friend! I wait your video long time! Good Luck
Hi there! Sorry for the delay. We'll publish the new video in three days (Friday 21st of May).
Impressive
Great video
Thank you!
It's amazing ❤️😍👍
Thank you! Cheers!
Upmation we are missing you
very nice
Thank you.
You're very welcome!
Very good explained
Hey! Thank you! Happy you liked it. Please let us know if you have any questions or suggestions.
@@Upmation sir I want to know about trip logic of motor or instrument air compressor
@@haidarquarrar8848 Ok, I'll transfer your suggestion to the team. Thank you!
@@Upmation thank you so much sir
GOD BLESS YOU REGARDS FROM SPAIN
Thank you! Happy to have you here!
Good job
Thank you!
nice video. Clear motivation to use relays together with high-cost controllers. You did not mention that the controller could be relatively cheap (just 200-300$) and have a fuse for outputs. Seems that in this case the relay on every output could be not so good idea if you want to save some money.
Add a video with safety relays please . Great chanel btw
Will definitely consider your suggestion. Thank you!
Good content😊😊😊
Happy you liked it! Thank you for watching!
Thank you
You're welcome!
Tnx
Thanks
You're welcome! Thank you for watching!
very good
Thank you! Cheers!
Thankyou
You're very welcome, Alex!
We need more videos
It's about 1 month now and we are missing you Upmation. Please when are you going to upload more videos?
Hi Bitebo! Sorry about these delays! We try to publish new videos ASAP. Thank you for your patience.
Good day sir ..I wish that you may content a vs motor and it's function ..ty more videos to come ..
Hey Jasper! Do you mean Variable Speed Drives?
Yes sir .. because there's a vs motor here and ..I don't how it works ..hope that you may content that one ..ty sir
Dear sir I like your video thank you for providing sir I need to understand the plc 750-323 completely writing components if your provide it good for me can you please?????
Nice videos. Please when are you coming up with the next videos?
Hello good morning I learn alot from your vedio
Can you provide schematic Diagram symbols, thanks 🙏 and more power
Happy we could help! We will definitely consider your suggestion. Thank you!
Thanks..
Very welcome! Thank YOU for watching!
Nice video, so when I need to control AC valves I should use relay between the PLC DO card and the actuator right? So basically just take 24V DC for PLC DO Card?
Hey! Thank you! As it's been explained in the video, it seems better to use a relay. If your valve is a single-phase valve use a relay. If it's three-phase, then use a contactor.
Your PLC card is not always a 24V type! It might be capable of switching whatever voltage you need. But it depends on the electrical current it can carry (pass). So you have to check the spec of the DO card you're going to use or buy.
One other complementary point is that (it's not relating to your question) when you are selecting your PLC card (on the detailed design phase of the project) you consider the loads you are going to connect to this card on-site and select the card. But you always consider some SPARE channels for each card and you cannot anticipate the loads they will connect to these channels. So there may be some conflicts between the type of DO card and the new load power ratings. So in this case they need to put a relay in between.
@@Upmation Thank you very much for your answer! I think this channel is really good (Ive liked and subscribed also). Currently I am using Delta DVP PLC where DC DO card is 24V, I am planning to automate dyeing process with this PLC. Since this is my first industrial automation project, I encountered some problems hahaha. Looking forward to gain insight from this wonderful channel!
@@chickenz4604 You're welcome! Good luck with your new project! :) Ask your questions down the way; although some questions are difficult to answer without access to the equipment, we do our best.
Nice
Thank you!
plz post an vedio internal work a plc
Hello :)
At 4:48 you have an example where the AC voltage is connected to Common and the siren to NO. Is it convention or more appropriate to have the Active/Live connection on NO and the siren on Common? This ensure that energy cannot flow through NC.
Hey, Michael! That's correct. This will ensure that the electricity flows toward the device, whenever the relay receives the command.
Thank you. Can you tell me which sofware you use in this video?
You're welcome! I'm afraid I don't know which software has been used by the graphics team.
Sir please make new videos regarding interlockings with wiring diagram and simulation. Thank you.
Hey Anil! Sounds a great suggestion! I'll transfer it to the team. Thank you!
I am testing 2Phase 208v output from an SSR whether the relay’s control voltage is energized or not. How do I design a dummy load so I can verify 0vac with the control voltage not energized and 208Vac with control voltage energized?
Good
Thank you!
Cool
Hi.Can you make a video about 2 and 4 wire connection to PLC ?
Hi there! Yes, of course, we can! Thank you for your suggestion!
Hi, Nice Video. but i have a doubt. Can you explain how to work the circuit of the EMR ?
Thank you! What do you have doubts about? The EMR functions as simple as we have explained. But we try to think more to see how we can elaborate more on that.
It's difficult to find relays that work directly from a microcontroller.. 24dv is already too much. So you need a transistor or relay to power the relay. I would like to switch 220v AC for long durations up to 16A. The power consumption of relays is also a thing here..
In one of our site, the entire IO modules in that DDC panel got short circuited and reason from tech team came as due to prolonged over voltage, what type of relay can be used to avoid prolonged over voltage? Any suggestions?
"Short circuit" and "Over voltage" are two different types of failure in the circuit. Consequently, you should examine different equipment to protect your circuit against them. In your case, as you have more sensitive electronic devices, you should choose protection devices with a faster response time. There are a couple of ways to do so. You can use surge protectors or "Isolators" for your analog cards and fuses (fused terminal blocks) for your digital cards.
Question: what can't we use a fuse instead of a relay?
thank you=)) im from viet nam =))
You're welcome!
can you make video basee in snap acting relay
I'll transfer your suggestion to the team. Thank you!
Can I use the same battery for both outputs on the relay for 2 different circuits? I did this but the relay keeps clicking. It can't stay on.
Hey! Sorry for my late reply! You can definitely use the same voltage resource (Power supply) for the outputs, as long as the amperage capacity of the power supply is on the loads' consumption range.
👌
Can you do one on mov’s
I'll transfer your suggestion. Thank you!
Sir how we find out electrical symbol can you please send me the PDF file?????? Same like your showing e auto cad???
Thanks 👍👍👍 ii
How do you read the diagram on the relay? They both look different.
Hey, Ziyad! Unfortunately, I did not get your question. Could you please elaborate more?
@@Upmation the relay has a circuit diagram printed on them.
@@Z-add We try to cover that in a video.