The best video on relays I have seen! I'm in a mechatronics program right now and the instructor did not explain these very well nor did he take one apart to show us the inner workings, so this helps tremendously; thank you!
You got that right!!! I'm a gear head and am currently wiring a line lock and a msd 6al-2 step into a latching relay setup. 94 z28. 6 speed. THANK YOU SIR
Discovered this by accident. I was an electrical fitter in a power station, in Scotland, for 35 years and in the early days we did our own maintenance and repairs on the lifts. This really takes me back. Plc control came in and specialists took over maintenance and all we did, in house, was emergency egress of passengers when the lifts broke down. When we did work on them I remember scratching my head trying to work through sheets and sheets of schematics!
It was the same in the BT (British Telecom) buildings - the relays in the motor room lift logic were very similar to the ones used at the time in the telephone exchanges - so they kept the old lifts running using their own engineers (or so I'm told)
This is excellent! I'm in my late forties and I was rubbish at physics at school, but now I have a project that requires me to understand basic relay technology and I found your tutorial very clear and well presented. Thank you!
Fuck, now I got it. I did all kind of mathematics in the electric engineering course ,like Karnaugh maps, Boolean algebra, Complex numbers, Integration etc, all passed very well, but now a days nobody explains you how a simple latch actually works. Good job man.
This is a master piece, when I watched this video years ago when I was about 11, it was so easy yet Complex that I could understand it because of your clear explanations!
its an excellent tutorial, It brought me back to the old Cross Bar electro relay telephone exchanges, if you want to see relays and understand them its mind boggling, the exchanges are full of them, it takes 3 weeks to teach the students on just how to get dial tone which is tracing the circuit from the picking up of the telephone handset to obtaining dial tone, I never did the course as I didn't work in the telephone exchanges, goes to show how smart the technicians had to be, well over my head, unfortunately when the semi conductor was invented and the exchanges used micro processors their knowledge became obsolete.
Awesome video. Very clear how this works. I'm a complete starter in this, just doing it for kicks and hobby. So you have explained how to use a "soft button" to turn a system on, how do you get the same button to operate as the off switch in the same circuit so that every other push is on, off, on, off, etc...
This could be done, but now you're probably introducing transistors and 'flip-flop' circuits. I'm not aware of an easy way to do this with just relays.
Another great video. I enjoy them all. Been an elevator "nerd" my whole life. To this day I still will peek in open elevator machine rooms or watch elevator maintenance personnel doing their thing.
+Fireship1 Cool! I didn't know there were other people around that liked lifts/elevators, but since I joined youtube in 2008 I've learnt that there are many people, including you by the sounds of it :) Thanks for your comment
Matt, I have to say that out of all the physics classes I attended at secondary schools, yours came out the best! Seriously... this relay video is very educative. I hope you make more of these... as you can tell, a lot of people appreciate the work you do in these videos.
That's a massive compliment and thank you very much for it!! :) :) I have plans to make further "easy to understand" electronics videos, but to do them "MRMATT" style with my perfectionist qualities takes time. Next video I want to explain building circuits using Normally Open, Normally Closed, Common, Double pole, Single pole switches.
Bloomin' heck, but through the befuddling circuits: a light was turned on in my mind. Amazing what you go through in just stepping into an elevator. It's a good vid to watch, .. Recommended.
Latching relays are clever, I got it now finally thanks to you. Didn't understand it when I was in college, I which I have seen your lecture back then. :)
Good question! The one that I am using to construct the circuit is a DPDT - Double Pole (2 sets of individual switches inside the relay) Double Throw (each switch has 2 contacts, one when it's on, one when it's off). The relay is 12volts. Buying the right relay is the easy bit, generally a 12v DPDT relay will suit most applications, the difficult bit is understanding "what connector does what" on the relay base - some are easy (like 12:01-12:05), some are not marked as clearly as this one is.
Sensational tutorial mate! You should get a medal for your teaching style -- it deserves to be duplicated in every classroom in the world! If only I'd had you as a teacher in school, I'd have taken over the world by now! ;-) THANKS! Keep up the great work!
+Robert Smallwood Many thanks for your comment! I have another video planned to explain COM/NO/NC for beginners. Not sure when I'll make it as I've got other videos on the go, but it's in the pipeline. I always explain things with complete beginners in mind. I've been on loads of training courses where the tutor has "assumed" that everyone was at the same knowledge level, then gone on and on, leaving less experienced people behind. I love explaining and training also. I always think that, if the person doesn't understand what I'm training, then it's up to ME to rethink how I should explain it differently so they do understand.
Thank you! This helped me design a simple circuit to latch an output from a small PLC. I'm holding an output until I see confirmation from another modules output, then I release the output with the other SPST relay. Thanks again.
Super-helpful, thank you! Realising that series/parallel switches correspond to logical AND and OR, and seeing how you can make a latching relay circuit, helped me design a scheme for powering a device in a car from the permanent BAT supply using the ACC supply to turn it on but not off (using a separate switch for turning it off).
Thank you for posting this! Unfortunately, I have a hard time understanding how relays work, especially when in use with I/O ports. This helped simplify and clarify.
Very, very well explained video that explains step by step without getting overtly technical. (My current challenge is a relay that turns on via a button, and off again after five mins - so can't use a 555 with a delay that long - This twin relay idea might help)
thanks for the comment. Sounds like an off-the-shelf 12v timer to me! For me, long gone are the days of soldering up a project that will do this when you can buy what you want from ebay for £5! ;)
Alas, I didn't find anything. The nearest was a push button that turned off after 1min -15 mins ... but that was wired to the power constantly via a transformer - the very thing I was trying to avoid. My unit 'isolates' itself from the mains when it goes off, and then uses a battery/switch to retrigger. (I finally used a thyristor and JFET)
Thanks for posting this! I'm installing a double decker car elevator lift in my garage floor. It came with a pair of chinese elevator control panels and a micro controller. I'm chucking all that crap and going old school with relays, limit switches and idiot lights to drive the hydraulics. To keep anyone else from running it, I've got a 4channel BT relay setup running from my cell.
this is one of the best electrical tutorials that I have seen so far! I hope that you do more of these videos that explains the basic electrical components and how to use them
Hashim Al Sakkaf Wow, many thanks for your comment - I do have one planned that explains exactly what you just mentioned, but focusing on COM/NC/NO explainations of the relay contacts and how to use them.
Thanks for this video! Surely I'll be visiting for more. Indeed this has been my big question for a long time but with the help of this video I'll likely succeed
The best,,,,,,, ,I've been searching for---ev--------er to find a Good video on 8 pin latching relays and how they work. Easy listing Easy watching ,,,,,,thanx
Cool, glad you enjoyed it! I did this a while ago now and did plan to make another one to explain COM-NO-NC as in my industry people have problems understand it! But it's on a long list of videos that I want to do and I might get round to planning it one day!
Really nice tutorial. I have done something similar in the school. the elevator diagrams you showed here could be useful when i like to make my homemade elevator sometimes... :)
Was looking for some thing els but your no nonsense explanation and diagrams hooked me in will be checking out your other vids. INFO was looking for a way to switch power supplies to a second immersion heater from my free solar switch it heats cylinder one first but has an output to another load we have a second cylinder with a separate supply when spare juice available would like it to go into cylinder Two
Many thanks for the comment :) I do the training for my company - I never assume people know something and I'll all about explaining things in a way that anyone can understand. Regarding your project, which device decides when Cylinder one has finished heating (to initiate the heating of Cylinder two?). I'm assuming the power being used here is mains (240v in UK)?
Very good explanation, best I've seen. But I'm a still a bit puzzled as to 'why' use a relay when you can connect 'direct'. I know there must be a very good reason for this but I've not seen it stated yet.
A relay can switch much higher current with smaller control wiring. You would have to run large gauge cable all over the place to handle the high amperages of motors. With relays you can use small gauge wire to energize the coil and the relay contacts can then switch the higher amperage load. When we use a relay to control a large motor we call it a contractor. (Same basic principal)
The advantage in logic and control circuits, is that one relay can control another. Which might control another. And you can wire each of the the coils and switches up in different ways. In this video, that only happens once, in the example with the latching and de-latching. But in a complex lift controller it can happen more. One relay latches when you press a button. It's coil is connected through a second relay. This one will break the circuit, un-latching it, when the lift arrives at the correct floor. Eg if the button for floor 4 is latched, upon arriving at floor 4 it needs to un-latch. But then those relays have yet more switches, and these can go towards controlling the lift's motor. To switch power to it when it has a floor to travel to. But of course the lift can go up or down. Other relays control that, deciding which way the motor is connected to it's power, to run forwards or back. And then there's a good few more relays completing the whole lift's functions. All wired in combinations. So some of the relays are turned on, not by a user pressing buttons, but by other relays. You can't do that with just a switch. And of course how would a user know which combinations of switch to press, if that was all brought down to buttons in the lift car? Not to mention the very heavy, high-voltage wires you'd need to run to the car, and the huge buttons to switch that much power. Using relays, you can use light, low-voltage wires to the user buttons. These wires then run up the shaft, to control low-voltage relays, which eventually control big powerful relays that switch the high power lines to the motor itself.
Daniel Sabag Thanks :) I am planning another one that explains COM - NO and NC contacts but I've so many videos to edit currently I cannot see when I'll start it!
fantastic explanation! I'm already very familiar with relays but this video is extremely thorough and you make the diagrams really easy to follow! well done!
Hello Great Video and thank you for your time in making it. I need to ask you a quick question on which relay I will need to operate 230v input and 0 volt or 5v output. Basically need a relay so when I plug it into wall socket motor turns oneway and when I unplug from wall socket it turns other way. The motor has its own power and is plugged in the socket all the time.
I think I get it, but just to clarify - What voltage will you use to activate the relay coil? What voltage will you be using to drive the motor? If you PM me your email address then I'll knock up a quick sketch for you.
@mrmattandmrchay Thanks a lot, really useful tutorial. I think this is especially great if there are any beginners that want to start using relays. This could come in handy for me. Its nice to have a little bit of extra electronics knowledge when you can.
+Nicholas Aarons (Nick Mini) Many thanks Nick, I have a follow up video planned, but no dates as of yet (takes loads of planning, voice overs, etc to finally get a video like this up)
Hey. Im still learning about automotive electrical wiring. I'm trying to built a power distribution box for my bike. The question is, can I use one main 40 Amps relay(coil get power from ignition) to power a fuse box that has 6 slots. And each slots has its own 40 amps relays. In each slot, the relays' coils will get power from its own independent switch such as horn or light, to complete the circuit. This is the order: Battery>Circuit breaker 30amps>Main 40amps relay (swithed from ignition) >6 way fuse box> 40 amps relay>light/horn switch>device. I want to power 6 devices each with its own relay. This is because I'm afraid if there's no relay between the device's switch and the fuse box, the switch might fail and cause a short circuit due to high amperage draw (such as a pair of horn). I hope you understand. Thank you
Great vid. Could you do one explaining how a program in a chip makes a physical reality happen? Example: a chip with a program in it causes a relay to open or close causing a circuit to energize or de-energize. I can't picture how 1's and 0's translate to physical action.
1's and 0's working in a microcontroller are just sequences of tiny voltage values. 1 means voltage present and 0 means no voltage present. The processor or chip running a program will have output circuits using semiconductors (probably transistors) to turn some of those tiny "microchip voltage" pulses into stronger, more usable "signal voltage" pulses through output pins on the chip or board identified as logic outputs. These logic outputs provide enough voltage and current to operate transistors or tiny, low voltage (5v or less) relays which can then control the power to the big relays running your device (lifts, factory machines, ventilation fans, heavy equipment, etc...)
The 0s and 1s are represented in the chip as, say, 0V and 5V. The same also in memory chips, and peripheral chips. It's all voltage or no-voltage. So the program code in a chip is also a group of voltages. Chips have an address bus and a data bus. They read data from a particular memory address by putting that address on their address pins. IE address "5" would put 5V on the A0 and A2 pins, 0V on the rest. The memory chip would then return the stored value from "5" by putting voltages on the data pins representing that value. As well as memory chips, though, other things can connect to the bus. It might be that address 999 (I won't tell you which pins that uses, because it's lots!) connects to an I/O controller chip. When it's address is on the address bus, it connects itself to the data bus to read what's on it. The voltages representing that data will flow into the I/O chip. Then the I/O chip will put those voltages on it's output lines. Those output lines connect to, say, an LED, or a printer port, or perhaps a relay or a power transistor. The relay or power transistor then controls a motor or heating element or whatever. So the voltages representing program code flow through a whole shitload of transistors, turning on and off according to an internal sequencer. Those voltages form addresses and data. If the address is a particular one, the data-voltages can be brought out to an external device, through an I/O chip that buffers that voltage, allowing it to supply lots of current. That current drives the relay. Hope you got this! It is a tricky thing to visualise at first. But at the real physical level that's all "programs" are, it's all the letters and graphics on the web are. Voltages on pins of chips, and inside those chips. Bring the voltage out of the chip, and you can control the world!
No enough information sorry. What are you attempting to do? What is the relay controlling? What is the old output supposed to control? What voltages are we dealing with?
have a practical exam this afternoon using the latching circuit with a fluorescent lamp i can now fully explain what i want to say thank you!
I'm really happy that this video helped you :) Many thanks for your message
The best video on relays I have seen! I'm in a mechatronics program right now and the instructor did not explain these very well nor did he take one apart to show us the inner workings, so this helps tremendously; thank you!
Thank you very much for your kind comment :)
You got that right!!! I'm a gear head and am currently wiring a line lock and a msd 6al-2 step into a latching relay setup. 94 z28. 6 speed. THANK YOU SIR
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Discovered this by accident. I was an electrical fitter in a power station, in Scotland, for 35 years and in the early days we did our own maintenance and repairs on the lifts. This really takes me back. Plc control came in and specialists took over maintenance and all we did, in house, was emergency egress of passengers when the lifts broke down. When we did work on them I remember scratching my head trying to work through sheets and sheets of schematics!
It was the same in the BT (British Telecom) buildings - the relays in the motor room lift logic were very similar to the ones used at the time in the telephone exchanges - so they kept the old lifts running using their own engineers (or so I'm told)
WOW. what a great explaination. im an engineer and this made me feel like i never really understood relays until i watched this video! THANK YOU
This is excellent! I'm in my late forties and I was rubbish at physics at school, but now I have a project that requires me to understand basic relay technology and I found your tutorial very clear and well presented. Thank you!
Fuck, now I got it. I did all kind of mathematics in the electric engineering course ,like Karnaugh maps, Boolean algebra, Complex numbers, Integration etc, all passed very well, but now a days nobody explains you how a simple latch actually works. Good job man.
I really didn’t realize that I commented and viewed this video 3 years ago lol. I fully understand now. Nice job on this!
This is a master piece, when I watched this video years ago when I was about 11, it was so easy yet Complex that I could understand it because of your clear explanations!
Well I guess I’m late to this video but I can tell you as a tech . It explains things the best . I hope young techs see this thank you
its an excellent tutorial, It brought me back to the old Cross Bar electro relay telephone exchanges, if you want to see relays and understand them its mind boggling, the exchanges are full of them, it takes 3 weeks to teach the students on just how to get dial tone which is tracing the circuit from the picking up of the telephone handset to obtaining dial tone, I never did the course as I didn't work in the telephone exchanges, goes to show how smart the technicians had to be, well over my head, unfortunately when the semi conductor was invented and the exchanges used micro processors their knowledge became obsolete.
Best video on relays i've seen so far with excellent visual and theory explained. Excellent.
this video was by far easier to understand than looking images up on google
Awesome video. Very clear how this works. I'm a complete starter in this, just doing it for kicks and hobby. So you have explained how to use a "soft button" to turn a system on, how do you get the same button to operate as the off switch in the same circuit so that every other push is on, off, on, off, etc...
This could be done, but now you're probably introducing transistors and 'flip-flop' circuits. I'm not aware of an easy way to do this with just relays.
The best video i ever seen I want to build elevator model with real life solutions and now i can build it THANK YOU SOOOOOO MUCH
Krzychxxx me too!
Another great video. I enjoy them all. Been an elevator "nerd" my whole life. To this day I still will peek in open elevator machine rooms or watch elevator maintenance personnel doing their thing.
+Fireship1 Cool! I didn't know there were other people around that liked lifts/elevators, but since I joined youtube in 2008 I've learnt that there are many people, including you by the sounds of it :) Thanks for your comment
Matt, I have to say that out of all the physics classes I attended at secondary schools, yours came out the best! Seriously... this relay video is very educative. I hope you make more of these... as you can tell, a lot of people appreciate the work you do in these videos.
That's a massive compliment and thank you very much for it!! :) :) I have plans to make further "easy to understand" electronics videos, but to do them "MRMATT" style with my perfectionist qualities takes time. Next video I want to explain building circuits using Normally Open, Normally Closed, Common, Double pole, Single pole switches.
Very good video,Lift companies should show these to Apprentices,Mates,even fitters.
Bloomin' heck, but through the befuddling circuits: a light was turned on in my mind.
Amazing what you go through in just stepping into an elevator.
It's a good vid to watch, .. Recommended.
Very nicely explained. You are genious. First ever video I saw , explains so nicely with DIAGRAMS.
Thanks a lot!
Latching relays are clever, I got it now finally thanks to you. Didn't understand it when I was in college, I which I have seen your lecture back then. :)
cool, many thanks for your comment! :)
Good question!
The one that I am using to construct the circuit is a DPDT - Double Pole (2 sets of individual switches inside the relay) Double Throw (each switch has 2 contacts, one when it's on, one when it's off).
The relay is 12volts.
Buying the right relay is the easy bit, generally a 12v DPDT relay will suit most applications, the difficult bit is understanding "what connector does what" on the relay base - some are easy (like 12:01-12:05), some are not marked as clearly as this one is.
Sensational tutorial mate! You should get a medal for your teaching style -- it deserves to be duplicated in every classroom in the world! If only I'd had you as a teacher in school, I'd have taken over the world by now! ;-) THANKS! Keep up the great work!
+Robert Smallwood Many thanks for your comment! I have another video planned to explain COM/NO/NC for beginners. Not sure when I'll make it as I've got other videos on the go, but it's in the pipeline.
I always explain things with complete beginners in mind. I've been on loads of training courses where the tutor has "assumed" that everyone was at the same knowledge level, then gone on and on, leaving less experienced people behind.
I love explaining and training also. I always think that, if the person doesn't understand what I'm training, then it's up to ME to rethink how I should explain it differently so they do understand.
Thank you! This helped me design a simple circuit to latch an output from a small PLC. I'm holding an output until I see confirmation from another modules output, then I release the output with the other SPST relay. Thanks again.
Cool, glad it helped!
Super-helpful, thank you! Realising that series/parallel switches correspond to logical AND and OR, and seeing how you can make a latching relay circuit, helped me design a scheme for powering a device in a car from the permanent BAT supply using the ACC supply to turn it on but not off (using a separate switch for turning it off).
Thank you for posting this! Unfortunately, I have a hard time understanding how relays work, especially when in use with I/O ports. This helped simplify and clarify.
Best described latching relay circuit on net.
Thanks a lot ❤️
Thanks and welcome
Very, very well explained video that explains step by step without getting overtly technical. (My current challenge is a relay that turns on via a button, and off again after five mins - so can't use a 555 with a delay that long - This twin relay idea might help)
thanks for the comment. Sounds like an off-the-shelf 12v timer to me! For me, long gone are the days of soldering up a project that will do this when you can buy what you want from ebay for £5! ;)
Alas, I didn't find anything. The nearest was a push button that turned off after 1min -15 mins ... but that was wired to the power constantly via a transformer - the very thing I was trying to avoid. My unit 'isolates' itself from the mains when it goes off, and then uses a battery/switch to retrigger. (I finally used a thyristor and JFET)
...outstanding tutorial. Thanks! And in ACTUAL ENGLISH! How refreshing!
Thanks! I get comments now and again about my accent - to me it's normal haha!
Best tutorial how latching relay work!Thank you very much!
thanks for the comment
Wow. Simplicity in explanation. Been struggling to understand this and you made this very easy to understand. Brilliant.
Thank you for making this video. I was researching relays to use in a small project, and this video really helped me understand how relays work.
Thanks for posting this! I'm installing a double decker car elevator lift in my garage floor. It came with a pair of chinese elevator control panels and a micro controller. I'm chucking all that crap and going old school with relays, limit switches and idiot lights to drive the hydraulics. To keep anyone else from running it, I've got a 4channel BT relay setup running from my cell.
You are very skilled at explaining things. Very well done.
+TheZionPhil cool thanks very much. I've been looking to do another one like this but all takes time to plan and record.
+mrmattandmrchay hello sir,where did you works..on youtube only or anywhere else?
This takes me back to my Uni days. I loved working with relays. I always found them much more rewarding than the microprocessor/assembly code options.
Very good animation, very good explanation with a nice voice, perfect instructional video.
Thanks
Probably the best video on relays! Thank you!
This one of best videos on relays .
Very neat explained.
this is one of the best electrical tutorials that I have seen so far! I hope that you do more of these videos that explains the basic electrical components and how to use them
Hashim Al Sakkaf Wow, many thanks for your comment - I do have one planned that explains exactly what you just mentioned, but focusing on COM/NC/NO explainations of the relay contacts and how to use them.
Your explanation helped me a lot, in particular your practical example. Thank you so much.
I can now do a self latching SPDT relay!!
Excellent! Glad you found it useful :)
wonderfully clear and concise . I have a better understanding now thank you.
one of the best free info presentation. thanks very much sir. more power !
thank you!
The best video on relays I have seen!
Thanks for this video!
Surely I'll be visiting for more. Indeed this has been my big question for a long time but with the help of this video I'll likely succeed
The work involved is very obvious. Excellent work!!
Thank you, this has been very helpful. I now understand what relays are and their function.
Cool, glad it was useful for you :)
The best,,,,,,, ,I've been searching for---ev--------er to find a Good video on 8 pin latching relays and how they work. Easy listing Easy watching ,,,,,,thanx
Excellent presentation! Shows the circuit diagrams and the real-life equipment, with transitions between the two. Great learning experience. Kudos.
Cool, glad you enjoyed it! I did this a while ago now and did plan to make another one to explain COM-NO-NC as in my industry people have problems understand it! But it's on a long list of videos that I want to do and I might get round to planning it one day!
thank you for the detailed explaination of relay and its types , this detailed explaination helped me a lot
Really nice tutorial. I have done something similar in the school. the elevator diagrams you showed here could be useful when i like to make my homemade elevator sometimes... :)
relays are became beautiful to me only because of u sir....
thank you
wowwwwwwwwwww....Real Application in compare to diagram..great teacher and fantastic coach. God bless maan
+Okusitino Tahitua Wow thanks very much for that! I must do another one sometime!
Thank you 😊 your explanation was excellent !!
Cool, thanks for the comment
Awesome circuit with great explanation! Thank you for sharing.
I enjoyed this video,it gave a very good explanation of a circuit,from simple to complex.
Cool, thanks for your comment.
OMG!! You totally helped me a lot!!! I spent 3 hours trying to figure it out. Saw this video and got it right away!
Fantastic. Thank you for taking the time to break this down. You really should be an instructor
This is a masterpiece.
Thanks, wish I'd spend even more time on it if I'd know it was going to get this popular lol! :) Thanks for the comment
Was looking for some thing els but your no nonsense explanation and diagrams hooked me in will be checking out your other vids.
INFO was looking for a way to switch power supplies to a second immersion heater from my free solar switch it heats cylinder one first but has an output to another load we have a second cylinder with a separate supply when spare juice available would like it to go into cylinder Two
Many thanks for the comment :) I do the training for my company - I never assume people know something and I'll all about explaining things in a way that anyone can understand. Regarding your project, which device decides when Cylinder one has finished heating (to initiate the heating of Cylinder two?). I'm assuming the power being used here is mains (240v in UK)?
this is the best presentation i have seen thanks for this video !!!
Thanks for your compliment :)
Thank you for spreading your knowledge and taking the time to educate us. Peace!
Fabulous... a clear explanation. Thank you!
I've been trying to fined some latch/unlatch relays and It may be easier to just do like you did and just make one
thank you so much for the information above different relays , this information helped to know in detailed manner about relay and its operations
Thank you for taking the time to record and edit as well as upload this. I found it relay informative. ;)
Namaste
Very good explanation, best I've seen. But I'm a still a bit puzzled as to 'why' use a relay when you can connect 'direct'. I know there must be a very good reason for this but I've not seen it stated yet.
A relay can switch much higher current with smaller control wiring. You would have to run large gauge cable all over the place to handle the high amperages of motors. With relays you can use small gauge wire to energize the coil and the relay contacts can then switch the higher amperage load. When we use a relay to control a large motor we call it a contractor. (Same basic principal)
+Fireship1 I meant to write "contactor"
The advantage in logic and control circuits, is that one relay can control another. Which might control another. And you can wire each of the the coils and switches up in different ways.
In this video, that only happens once, in the example with the latching and de-latching. But in a complex lift controller it can happen more. One relay latches when you press a button. It's coil is connected through a second relay. This one will break the circuit, un-latching it, when the lift arrives at the correct floor. Eg if the button for floor 4 is latched, upon arriving at floor 4 it needs to un-latch.
But then those relays have yet more switches, and these can go towards controlling the lift's motor. To switch power to it when it has a floor to travel to. But of course the lift can go up or down. Other relays control that, deciding which way the motor is connected to it's power, to run forwards or back.
And then there's a good few more relays completing the whole lift's functions. All wired in combinations. So some of the relays are turned on, not by a user pressing buttons, but by other relays. You can't do that with just a switch. And of course how would a user know which combinations of switch to press, if that was all brought down to buttons in the lift car?
Not to mention the very heavy, high-voltage wires you'd need to run to the car, and the huge buttons to switch that much power. Using relays, you can use light, low-voltage wires to the user buttons. These wires then run up the shaft, to control low-voltage relays, which eventually control big powerful relays that switch the high power lines to the motor itself.
What a job well done. Fantastic explanation. Kudos to you
one of the best tutorial video on relays
Daniel Sabag Thanks :) I am planning another one that explains COM - NO and NC contacts but I've so many videos to edit currently I cannot see when I'll start it!
I'm waiting for such a video very much
fantastic explanation! I'm already very familiar with relays but this video is extremely thorough and you make the diagrams really easy to follow! well done!
This is great!
Thanks so much for explaining so we'll, how latching relays work.
( Years ago; I worked with large relay arrays).
The perfect explanation in all ways. Thank you, sir.
Thanks very much for the comment :)
Excellent video - and I've seen plenty of these before getting to yours! Thanks!
cool, thanks for the comment :)
Brilliantly explained - Thanks very much
getyaboogieon Many thanks!
very good video...............you must have done lot of effort.........thank u very much for the very useful information
thanks :)
Great video mrmattandmrchay, from a Schindler Elevator empolyee.
Re relays, best tutorial I´ve come across.
Ty
very understandable apart from common..is common the power or neg supply?
Great vid, very educational, made very clear, could be used at school level. Look forward to seeing more.
Oh, and i forgot to say, excellent tutorial!
Awesome video! Very well thought out, simple and clearly delivered!!!! Thanks for posting this....
Hello Great Video and thank you for your time in making it. I need to ask you a quick question on which relay I will need to operate 230v input and 0 volt or 5v output. Basically need a relay so when I plug it into wall socket motor turns oneway and when I unplug from wall socket it turns other way. The motor has its own power and is plugged in the socket all the time.
I think I get it, but just to clarify - What voltage will you use to activate the relay coil? What voltage will you be using to drive the motor? If you PM me your email address then I'll knock up a quick sketch for you.
Very good, and informative. I want to go make a latching relay circuit my self.
Let me know if I can help
Where can I find the relay that you have used in this video?
@mrmattandmrchay Thanks a lot, really useful tutorial. I think this is especially great if there are any beginners that want to start using relays. This could come in handy for me. Its nice to have a little bit of extra electronics knowledge when you can.
Fantastic!!!!!!!!
I love Relays.
me too - most of my channel is based on lifts/elevators that use them :)
Cool, thanks :) I like positive feedback because I enjoy teaching people stuff and tutorials like this take absolutely ages to do!
thank you so much .. the best explanation i have ever seen ... you are awesome
VaRuN SiNgH Thanks very much! :)
Excellent very clear explanation.
+Steve Smith Thanks
just started learning PLC and i love your explanation. keep em coming mate! subscribed!
Best video yet, great job
That Was Fantastic. Keep up the great work. Nick.
+Nicholas Aarons (Nick Mini) Many thanks Nick, I have a follow up video planned, but no dates as of yet (takes loads of planning, voice overs, etc to finally get a video like this up)
Hey. Im still learning about automotive electrical wiring. I'm trying to built a power distribution box for my bike. The question is, can I use one main 40 Amps relay(coil get power from ignition) to power a fuse box that has 6 slots. And each slots has its own 40 amps relays. In each slot, the relays' coils will get power from its own independent switch such as horn or light, to complete the circuit.
This is the order: Battery>Circuit breaker 30amps>Main 40amps relay (swithed from ignition) >6 way fuse box> 40 amps relay>light/horn switch>device.
I want to power 6 devices each with its own relay. This is because I'm afraid if there's no relay between the device's switch and the fuse box, the switch might fail and cause a short circuit due to high amperage draw (such as a pair of horn). I hope you understand. Thank you
Great vid. Could you do one explaining how a program in a chip makes a physical reality happen? Example: a chip with a program in it causes a relay to open or close causing a circuit to energize or de-energize. I can't picture how 1's and 0's translate to physical action.
1's and 0's working in a microcontroller are just sequences of tiny voltage values. 1 means voltage present and 0 means no voltage present. The processor or chip running a program will have output circuits using semiconductors (probably transistors) to turn some of those tiny "microchip voltage" pulses into stronger, more usable "signal voltage" pulses through output pins on the chip or board identified as logic outputs. These logic outputs provide enough voltage and current to operate transistors or tiny, low voltage (5v or less) relays which can then control the power to the big relays running your device (lifts, factory machines, ventilation fans, heavy equipment, etc...)
The 0s and 1s are represented in the chip as, say, 0V and 5V. The same also in memory chips, and peripheral chips. It's all voltage or no-voltage.
So the program code in a chip is also a group of voltages. Chips have an address bus and a data bus. They read data from a particular memory address by putting that address on their address pins. IE address "5" would put 5V on the A0 and A2 pins, 0V on the rest. The memory chip would then return the stored value from "5" by putting voltages on the data pins representing that value.
As well as memory chips, though, other things can connect to the bus. It might be that address 999 (I won't tell you which pins that uses, because it's lots!) connects to an I/O controller chip. When it's address is on the address bus, it connects itself to the data bus to read what's on it. The voltages representing that data will flow into the I/O chip. Then the I/O chip will put those voltages on it's output lines.
Those output lines connect to, say, an LED, or a printer port, or perhaps a relay or a power transistor. The relay or power transistor then controls a motor or heating element or whatever.
So the voltages representing program code flow through a whole shitload of transistors, turning on and off according to an internal sequencer. Those voltages form addresses and data. If the address is a particular one, the data-voltages can be brought out to an external device, through an I/O chip that buffers that voltage, allowing it to supply lots of current. That current drives the relay.
Hope you got this! It is a tricky thing to visualise at first. But at the real physical level that's all "programs" are, it's all the letters and graphics on the web are. Voltages on pins of chips, and inside those chips. Bring the voltage out of the chip, and you can control the world!
Thank you for this video sir. Could you explain how this latching relay is implemented in elevator by using plc
Visuals of relay concept is very good..
No enough information sorry. What are you attempting to do? What is the relay controlling? What is the old output supposed to control? What voltages are we dealing with?
What program you are using
Excellent video ! Explained very well, Thank You !
+Keith Shreve thanks for the comment :)
GREAT, absolutely great. Wonderful video. Thank you very much.
Bravo ! Perfect ! clear explanation ! Thank you Sir !
What a perfect explanation!
Cool, thanks!
Great video. You also sound just like Alfred from batman