Solid state relay | SSR
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- Опубліковано 5 гру 2014
- Solid state relays are similar to traditional electromagnetic relays but they have no moving parts and the switching is done via solid state circuitry rather than an electromagnetic coil. This video demonstrates how an SSR (solid state relay) works using a bench power supply unit.
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SSRs are prone to back EMF damage. When using them to power an inductive load such as a solenoid coil or motor coil, when the power is cut to the coil, the magnetic field collapses. This causes a very high voltage spike of very short duration. This voltage spike will eventually destroy the relay. To overcome this, in a DC circuit, a diode connected in parallel with the coil and ground is installed in a reversed bias orientation. Because it is reversed biased, it is normally not conducting, but when the voltage spike occurs, it will be shunted to ground, shielding the relay from damage. In an AC circuit, sometimes a 'snubber' is installed (r-c ) with a MOV.
Thanks for the info ;-)
wrong.... a SSR turns on at the zero voltage crossing and off at the zero current crossing...when used correctly..
your the best thank you I appreciate the videos and information I'm sure your very well trusted in the UK your very knowledgeable on alot of subjects
Thanks for the comment ;-)
nice video , what is the max frquency can we use on the input ?
Well that explained it very well, I always wondered wheter you had to leave the switching voltage on all the time or whether it was just a pulse... Thanks for clearing up that one.
I'm glad the video helped
Thanks for the comment 👍
@pete r
It could be induced voltage from a nearby circuit. Led's are notorious for this.
im doing this but instead of the light bulb being the old type im using one of them cheap led converted ones. im doing this so i can turn my lamp on/off by my pc using an arduino. for the leds to flash they need voltage. but if the relay is off that makes a break in the positive (live) wire meaning the bulb should not light up. im an armature but i cant understand how this is doing this. www.glacialwanderer.com/hobbyrobotics/?p=9
anyway thankyou for your reply. i guess ill have to forget about the project :(
pete r
I have not got time to check out the project but try replacing the led with a normal tungsten filament lamp and I bet the problem subsides.
***** agree the Mains LED is not the best load to use as unless you know what method they use inside the bulb to convert from mains to LED drive voltage. Try an old type (mains rated) relay with a low voltage drive coil..?
Those are neat. didnt know those existed. The variable voltage for the activation is great.
Yes, they are very handy for that very reason.
Thanks for the comment
is this must to provide AC volts just for testing at output side? or will it show continuity just with multimeter?
Very informative video as usual, I have a quick question about one of your older videos but thought I'd ask here as you're more likely to see. Regarding the video on Bahco ratchet spanners you mentioned that the bolt/nut cannot pass all the way through and so is held captive making it easier to use. I assume this only works for the larger side of the two, for example a 19mm bolt wouldn't pass through due to the smaller 18mm on the other side but would the 18mm pass through because the other side is larger or is there some sort of plate etc that stops this happening? Thanks in advance, keep up the good work!
Yes, that's correct. When using the larger of the two sizes the nut cannot pass all the way through the spanner due to the smaller size on the other side of the spanner (this is useful for one machine that I work on that is 15mm). They are probably my most used spanners to be honest as one spanner does 4 sizes, but they do have some drawbacks for example they are no good for tightening or undoing nuts and bolts on pipework flanges as the heads are too big, but this is normally true with any ratchet spanner.
Thanks for the comment
i had one of these relays to turn on/off a 240v (UK) light fitting that had a led bulb. when the relay was i nthe off position the led light would flash on and off. when i turn relay on the light would light up as it should. i cant figure out why the bulb flashes when the relay is off. can anyone help ?
Sounds like a bleed leds can activate with very minimal voltage
worked out how it works but i want to wire it up to my cyclone dust extractor with micro switches on my blast gates. what wire do i cut and join the the power input to the relay
I used one of these for a garage door opener. I put the SSR in the live wire powering the garage door (all in a neat enclosure)
Thanks for your teaching sir
Welcome!
another great thought provoking video.
what do you make from this ?
I used it in the remote garage door lock controls-ua-cam.com/video/b2iGCjkMaug/v-deo.html
The 12v supply is taken to the normally open terminals on each limit switch and then the solid state relay. Once both limit switches are made it energises the solid state relay, which then switches on the power to the electric garage door opener.
What the different between
MGR/SSR
Would you be able to do a video on relays that reverse polarity
Yes, I have done a video on a remote control relay board that reverses polarity, it will be uploaded soon ;-)
Hello i have a 12v 4amp adapter
I want to turn of and on my water pump motor with ssr relay
So if i give the 12v current to the ssr relay while testing other 2 points continuity i dont get any beeps from multimeter why is that can you tell me what i am doing wrong?
I am building a brewery at home and use two SSRs wired to the back of two Dual Pid Digital Temperature Controllers, as the controllers can only switch about 3amps. Works great but you have to set the PID controllers up so they have an output cycle time of a couple of seconds or you burn out the SSRs as I am switching 10amps.
Sounds interesting ;-)
Could you not use the SSR's to control a contactor? and therefore use the contactor to switch the 10 amps.
How big is the brewery BTW, if you ever need a chief tester let me know LOL (only joking, I don't drink normally)
***** I could have, I googled a lot before going for the SSRs and the Electric Brewery Company (www.theelectricbrewery.com/) use SSRs directly from PIDs. My brewery is based on stainless beer kegs, I am using washing heating elements to heat the water.
Hoverdog Brewery
Looks good ;-)
At least you know what ingredients go into it if you make it yourself. I'm sure they put something in Stella Artois that makes people want to fight LOL
Hello. your video is very interesting. I would like to know if it is possible to connect the input of the ssr relay to a 12 volt 100w solar panel and to the output of the relay I plug in a 220-240v 1100 watt electric pump. thank you so much.
I'm not sure about that, sorry ( I do not know if the output from a solar panel is stable, or fluctuates)
Thanks for the comment 👍
@@ultimatehandyman thank you very much
The output specifies 214-480 VAC. Can this SSR be used to 'switch' a DC load ?
No, I don't think it can.
You might be better off using a normal relay instead.
Up to around 60v DC would be ok, according to the datasheet.
This is what I like to learn.
Can my SSR-10AA (220V input) manage to switch a DC 24V load?
I've got a 40 amps SSR. But it shows no continuity even if there is an input DC voltage given. But when I connect a supply ac voltage of 220v to one terminal I tested the other terminal with a tester tester light blown. Also Multimeter shows 220v from the exit terminal. But no input DC voltage is given. Also the weird part is even Multimeter shows voltage from exit terminal, it. Does not show continuity between those terminals. I didn't understand why. Any idea
That is strange, but it sounds like the SSR is faulty.
Perhaps it has failed closed circuit, but the multi-meter is not putting enough voltage through it to measure continuity - a bit like when a Megger unit is used to find a faulty motor winding, that can often not be detected using a multi-meter either.
Thanks for the comment
hi, if i use one of these, how long can the solid state relay be energised for at any one time? i.e if i use an electromagnetic relay it seems to get hot and burn out after an hour or so. seem as these have no moving parts can they be energised for long amounts of time? thank you
Shane Coley
Hi, I don't think energising one of these for long periods of time will be a problem as there is no electro-magnet in them.
SSR's need a heatsink if you are going to power something off of it that runs at 20-30 amps.
I have attempted to register but have not received the activation key for the forum. I have 3d printers and one of them has a solid state relay in it and I can get the printer to turn properly with it wired into the system. One of the printers is factory built and have the same basic setup and it works. Not sure what I did wrong, both are wired the same.
Sometimes registration emails end up in the spam folder.
For your specific problem, it might be worth asking the manufacturer via email, or ask in a dedicated 3D printer forum, as they will be experts.
How fast it can switch?
now how do you get the reverse affect? When there is a current it switches off
You get a normally closed SSR
When it is energised it will open the circuit
Electronic control of tankless water heater: Use a PID? SSR vs SCR?
I have an 8KW Atmor tankless water heater that has two switched heating elements. I want to add stable electronic temperature control. But I can't find good information about the different options!
Seems the PID + SSR MAY have longer switching time, and that MAY reduce heating element life from thermal cycling vs a higher speed SCR. But I am having trouble finding the real answer.
How do u wire a ssr relay for pwm ground?
Not sure, sorry.
can this SSR handle to control a water pump with 4hp 220v?
Not sure about this particular one, but you will be able to get one ;-)
which one do you recommend ? and thanks for the reply ?
Do you know how many AMPS it will use?
I have had a quick look and seem to get the figure of 32A, so I'd go for something like this 40 Amp one-
fave.co/2aipV1G
yes i agree with you but i saw someone talking about the starting current.. and it needs something like x5 of the current needed ( for ex the pump needs 30A so i should put 30*5=150A relay ) do you agree with that ?
I forgot about the starting current. You might be better off using a contactor?
Saw a vid where he had a DC fan running off the VAC??
🤔
What do you use your bench power supply for, out of interest, are you an electronics geek?
I bought it for testing out the equipment for the remote garage door locks that I made but ultimately it will be used to power the line bending machine that I made yesterday (for bending acrylic). I am interested in electronics though as I'm an electrical/mechanical maintenance engineer.
Thanks for the comment
***** oh right. I thought 'Ultimate Handyman' was a full time professional company. Do you service factory style equipment?
Maxsdiscos
If I'm not working on the website or making videos I subcontract as a maintenance engineer for a large chemical company doing machine servicing and some installation. Ultimate handyman was just a name I chose when setting up the website, if I knew then what I knew now I would have called it something else LOL
Thanks for the comment
But like, how does it work? how is it actually doing that switching?
Not sure, I just know how to use them 😂
If I was going to make a relay with no moving parts, I would use a circuit with a light emitting diode on one side of the circuit and a photo resistor on the other circuit. I don’t know if this would work, and I have no idea how a SSR works internally 😂
Thanks for the comment 👍
@@ultimatehandyman You somehow just intuited a valid SSR design, what a legend😂
Worth pointing out that you need to test for continuity in diode test mode for most multimeters.
Thanks for the comment
Ac toAc input°°°° L or N
Fun
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