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- เผยแพร่เมื่อ 23 เม.ย. 2015
- How to draw Ladder Diagrams
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I'm struggling to make this make sense at school, here i am at 2am with no rush listening to this guy who makes everything so clear and simple to understand. Great job
Sitting here in Covid lockdown looking at relay logic. Started working with relay logic back in 1960 and, of course, graduated into PLCs and computer systems for control and instrumentation. Now 79 and retired. I still have a box full of relays and switches in my garage. Maybe I'll find a use for them one of these days.
There was always something very absorbing watching a huge bank of relays in a complex control system clattering away in a seemingly random fashion. I'm certainly not advocating returning to those days. I've spent too many hours looking for loose, broken, or dirty contacts and connections. Microprocessors have made the job much easier and economical especially in large and complex systems. Relay logic clearly still has a place in simpler applications in terms of cost and reliability.
Enough of my old-man memories. Thanks.
Thanks so much for the insightful comment Trevor.
i hope to be a retired electrical guru like you, some day. im 38 and will be starting out as an electrical worker this year.
Would you like to part with those relays sir? I am an instructor for an apprenticeship program. It is non profit so I don't get a lot of materials to use for demonstrations. I, like your self, am retired and I have a class Monday through Thursday evenings for about 3 hours. I would love to have a price sent to me so I can see if I can afford these to help with my teachings. Have a great day sir.
YESSSSSS VREE! one of the best professors I know!
Well done. Easy to follow and detailed instructions!
very helpful. helped me with my shop projects, this should be shown in class.
Good explanation, makes it clean and simple.
Very Helpful as well as part 2 or 3....Thanks Pete!
Very helpful. I appreciate your expertise!
Very helpful video! Thank you for sharing.
Thanks Pete - much appreciated
Thanks man. I'm a millwright apprentice in Kitchener. This stuff helps
good explanation and easy to understand! Thank you sir!!
Great Job Pete.
Thanks Pete. Nice commentary.
You're a great teacher.
I'm going to refer to Norm Macdonald's clips now....
all of your links are interesting ....especially Katie at Galco !
very nice and great teaching method, great sir
Excellent!!
Thanks for this. Very helpful.
thank you this helps in my class
Wonderfully done
Outstanding sir! Thank you
Yeah i got the formula it easy .Thanks
Nicely explained
Thank you.
Please at point 3 & 4 (latching circuit). , 1 & 5, and 1 & 6 contacts to operate both red and green light. We have some terminals of relay there as well e.g at point 1&6, we have relay terminals of 8&6 as well.
My question is are we connecting this relay terminal to this point as well
great video
Hi, can you do a video with 11 pins and thank you for taking the time to make them they are as clear as a classroom .
Very helpful this video
Hi, I like your lecture . Thanks
Thank you!
I am having this issue thanks for making this video. But one thing I’m not understanding is when it comes to wiring the block are you wiring it based on who you have it numbered in the diagram ? With the start button you jumper from the stop to the start then the number one goes on the bottom of the start button with number three
Thanks sir
I have emprexd your video...
Thanks! Can up load npn and pnp sensor working principle
Thannks u were a lot of help
thank you
Good shit!
thanks sir .
Awesome, thank you.
Any time. Thanks so much for the nice comments. All the best. Pete
briliant
interesting diagrams
Thanks
relays are simple but the things you can do with them gets confusing
good one
Thank you, this really helped me a lot on how a ladder diagram works on a relay. But do all ladder diagrams refer to relays? Or can they be used as basic point A to point B wiring? Thanks in advance!
+Samneil Samson They don't always incorporate a relay. They could simply use a contactor for a motor. And, yes, you can often use a ladder diagram to simplify any circuit you are working on.
thanks
Thanks man I will make video like you, you video very informative
Ok. Thanks for the nice comment. Good luck with your TH-cam channel.
How did they get Norm Macdonald to do the voiceover on this?
+Wavestrike Electronics Always amazes me how different you end up sounding on video compared to the manly voice that reverberates in my head. I'll take it as a compliment though. Here are some of Norm's best clips. th-cam.com/video/JaduY_sKce4/w-d-xo.html
Pete Vree
Thanks From Admin and All ,
Kindly share a video about how to interface between real schematic of customer (Hydro power Generator) to PLC
tnx
thanks alot
R A N O V A T I
O rano
can u dicus about the 12"14"16 pin relay
Hi Pete, can you do me a simple three phase ATS DIagram using contactors, AC, DC timers and relays please? Include Generator Control to auto start as well. Do not include voltmeters, frequency meters & Cts...just a simple one.Thanks for your consideration.
Can you give idea how to read electrical drawing and how start
In your cautionary note, to clarify: as I see it it would initially work, but you could never shut off because the stop switch is bypassed, right?
Yes. That is correct.
I'm taking a hvac class and were learning schematic diagrams and it really confusing
so 2 and 7 on the 8 pin contactor feed the coil for the control circuit? which # is the neutral?
Convention is that Pin 7 is the return/neutral
“Then essentially we are stuck” lol
great viedio #starconnectiondeltaconnection#
Great video. However, I don't see the need to use a jumper because 1-4 is fed directly from the power supply, and Pin 1 is hot regardless of state of the stop switch. And I'm not sure about using contact 8-5 as opposed to contact 1-4. They are both controlled by the coil and are fed independently from the power supply.
Have a look again... the video is specifically made to address this misconception.
What good text book name for this stuff
Can you explain how the control relays coil will stay energized after the start push button returns to the open state
Current still flows to the coil because the relay contacts have changed state. The normally-open (in rest state) is now closed. This provides a parallel path around the start pb to keep current maintained to the coil.
@@PeteVree th-cam.com/video/77tDhXDsfqI/w-d-xo.html thanks for all the valuable information
The only thing I'm confused about is right before the 10 min mark when you say it bypasses the stop button when some people try to use 1 and 4. As I look at it, that contact would still change state when the stop button is pushed and the red light should work.
that's how l see it too...
Thanks for commenting. I wish Pete would chime in.
When the start switch is pressed, power flows through it to energize CR, closing contact 1-3. The stop button is bypassed because point 8 and point 1 are both connected to supply voltage. So power is fed (follow the red line) past the stop switch. You can press the stop switch and it will have no effect. The correct NC contact to use would have been 8-5 for the red light.
ussreeves has the best explanation below. Thanks for clearing this up guys.
Boomer NYOB You could still use contacts 1-4 if you use a separate piece of wire coming from L1 to pin 1. Then come out of pin 4 to your red light. But contacts 8-5 would be more efficient by not having to run an extra piece of wire.
What If the supply for the relay is 110v and the your pilot light only needs 15v what will you do
A step down transformer would be required. Often a pilot light will incorporate a small step down transformer as part of the unit. Here is an example of a 120 v supply, 28V pilot light
www.crescentelectric.com/industrial-automation-and-control/electrical-controls-and-accessories/indicatorpilot-lights-and-accessories/indicator-lights/indicator-or-pilot-lights/30mm-push-button-type-sk-pilot-light-transformer-120-vac-red-fresnel-cap
dude thanks . good teaching . 1 question . is that a latching circuit . i mean pb 1 and pb 2 , with that coin at the first line ???
+Lc Fadz It "latches" because the holding contact closes and provides an additional path for current to be maintained to the coil
In this schematic we numbered the terminals of the relay contacts. Why do we not number the stop, start and light terminals. Is this not done etc. I am an apprentice and would like to know this point for exam purposes. Thanks
The light, push button terminals have no polarity, and so it would be redundant, and a complete waste of time to put numbers for all of those components. Also, it would really crowd your ladder diagram. On the relay, you have a choice of using commons 1 or 8 for example, so you have to put the terminal numbers in for ease of installation and trouble shooting later on.
Thanks for clarifying this in detail. Now i appreciate the terminal numbering better and its importance in wiring diagrams.
The relay has those numbers, he's just trying to help on how to use each number on the relay
On an electrical schematic, those termination or landing points would be called out.
sir please could you make a video drawing a diagram of a gameshow button with buzzer and relay timer... please
Your stuck unless you put in another control relay right?
The circuit as shown can be done with an 8 Pin relay, but if we needed more logic to happen, we would need a second CR or an 11 Pin Relay
Pls feature 11 pin Omron timer
I hope I will not miswire one of thoses bad boys out there ahah, they seem sneaky troublemaker
It’s all good just follow the PIN numbers on the block
3:07
Is this AC or DC?
Dc
Check also here for motor control
th-cam.com/video/eAj8YMG8gfU/w-d-xo.html
Thanks Pete - much appreciated
Thanks