simple soft start circuit DIY
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- čas přidán 3. 06. 2024
- Hi, Guys..
Here is a "quick and dirty" way to build a soft start circuit for power tools or heavy inductive loads on 230 volt AC.
It is built with a absoblut minimum component count.
I am using this circuit for more then 15 years now.
It is a "proven concept".
Feel free, to copy my circuit, but be careful, when working with mains voltage. ;)
#softstartcircuit
If you want to support me and my projects out here in the shop, you can become a patreon under:
/ larifari - Jak na to + styl
🙏 I like the circuit and your patient & clear explanation 👍
Nice, very simple indeed.
Great idea. Thanks for sharing... and for looking after the hedgehogs!
Thanks for sharing!
Liked the clip. Thanks. Liked the notion of using a diode to drop the current seen by the motor. Your local parts electronics store might max out at 3 amps, but you can parallel two or more diodes to get to the current that might work a little better, I would guess.
Yes, you are right, the diode sees about half the current, which the motor takes when it is "full on". ...and just for 1 second. I have "upgraded" my 1200 watt table saw with this circuit about 8 years ago and it still does its thing. Paralleling two or more diodes would work, if there is the need for more "juice" ;) But i have to mention, that some loads / Motors are not happy with the diode, then you have to use a low value, high power resistor istead... Every Motor shows its own individual behaviour, which may make slight changes in the circuit necessary. Thanks for stopping by, my friend..... Greets from Germany.
Theoretically, using two or more diodes in parallel to share the current load may work, and in fact it will to a certain extent, but in practice you should never do that.
The reason is that internal resistance of the diode, along with its voltage drop are never exactly the same between diodes, even in a series of diodes made in the same batch. The current will always flow in the diode that presents the least resistance. So in fact, both diodes are connected in parallel but only the one with lower resistance will carry most of the load (as resistance is not summed in parallel junction) and will probably fail because it is already used in its boudaries. This is also a common mistake done in LED lighting.
Thank you
Hi do you have a parts list available ad I need these to use solar power for my power tools please and thanx
So nice thanks sir
The simplest circuit is a diode in parallel with a toggle switch in the phase wire break
Yes, you are right.. Thats what i did on my table saw, when i was a apprentice.. I had a 2 step rotary switch. (0 - 1 - 2).
Great design by its' simplicity! Do you think it will work with 650 VA toroid transformer on 230 V?
If you choose a relais, which can handle the load current ..so at least 3A continous at 230 V...than the circuit will work for your task... And as i said in the video, if the half way rectification with the diode gives you weird behavior, you can try a high power resistor intead of the diode.. (typically somewhere between 1 and 10 ohms (test)).. Thats how its done in a microwave oven, because the big transformer also has a huge inrush current.. Greets from Austria..
Good day lari. Thanks for sharing this, its help a lot. I plan to make this one, my question is,can i replace those relay on the circuit, and use dc to ac solid state relay, instead ? I planning to make this one, and install it to my 2hp water pressure belt type.
has the Water pump a induction motor? Than the diode method will not work. Replace it by a high power resistor (somewhere 1 to 10 ohms), or better an wire wound ballast. Like i did on my table saw build. The solid state relais shoul theratically work, but it draws way less currrent than a relais coil. So you will need prbably a smaller dropper capacitor. 220 nF or less. It is a bit of a trial and error thing, to mach up all the components, to get the desired behaviour of your load / motor.
Great explanation sir. Could I ask you which component handles the delay?
It is the electrolytic capacitor. And the threshold voltage on which the Relais kicks in. Make the electrolytic capacitor bigger and the delay gets longer..
Hi, great friend Lari!
I finally managed to assemble!
The story is a little long, but the changes were:
330 nF to 1 uF capacitor (to get 10.6 volts);
Capacitor from 470 uF to 2200 uF (to get a 1 second delay);
Rectifying diode from 6 amps to 20 amps (to guarantee an 1800 Watt saw);
24 volt/1 Watt zener diode for 12 volt/5 Watt (just in case if it gets hot);
24 volt relay for 12 volt/16 amps (from microwave oven).
The mount was a little bulkier than yours, but the important thing is that I won't have that feeling that the saw blade wouldn't fly towards me when turned on.
Thank you very much for your help!
A big hug from Brazil!
Merry Christmas and a Happy New Year to you and your family
THX for the report, my friend. Nice to see, that you have made so much effort, to adapt this circuit to the grid voltage of your country... So that other people from the 120 Volt world can copy yours... Thats what i call "evolution" xD I have added the soft start to all of my power saws, because i had the feeling, that the violent startup is not good for the gears. The machine should last longer, with a soft start...at least in theory... Merry Christmas from Germany.
Why you upgrade bridge rectifier 6 amps to 20a. I think enough 1A 1N4007x 4. What do you think ?
@@harunozcan5380 Hi Harun
I opted for a diode (only one) of 20 amps because the circuit is for a table saw of 1800 Watts.
The calculation formula is: Power divided by voltage
(1800W /127V equals 14.17 amps)
4 diodes in parallel, according to the literature, is not advisable, because, although in theory they are the same, in practice they are not. The parts are not manufactured exactly the same and the current ends up flowing in different amounts in each one.
Lari can explain better than I can.
A hug from Brazil
In time: 4 x 1N4007 diodes in parallel would support 4 amps, theoretically
@@claudemirvernini6719 hi, where do get 20a diode? I'm looking to buy one.
Hello sir. Thank you for this great video.
I am helping a carpenter with his machines. His machines start at very high current as you say. For example an old bandsaw. i think it draws around 15 amps on startup then 3 amps. What is the simplest/cheapest way to reduce the starting current? is the soft starting the best method? thank you again
Hmmm..i think, the startcurrent of such machines is way more than 16 A... Its more like 20 times the "normal" current. This would be 60A for your Bandsaw, for a short moment...
It depends on what kind of motor these machines have. I assume, the bandsaw has a induction motor. You can use this soft start circuit also for induction motors but then you need to change the Diode for an high power resistor. If you dont want to solder by yourself, by a cheap timing relais and a contactor. Recently i finished my table saw project. The Saw has a 2, 2KW induction motor. I use 200 meters of single core installation wire as a start resistor. (ON for 2 seconds). For the timing i use a Microcontroller, but you dont have to bother with that. Its just because i can. ;) Watch my vide "table saw PT 4".
Great video! I was looking for this circuit. Only one question. Is the 330 nano F value ok? Does not have to be micro F? Thanks!
It depends on your grid voltage, freqency, and the current which your relais draws... There is a proper calculation, to get the perfect value. (or look for onlinecalculator) If you dont want to do the math, try differnt values..... Start with 220nf and increase, till your relais gets enough juice...but not to much. If you overshoot to much, the zener diode gets hot.....
Thats usually the way i do it.... Because i am a fool.. xD
@@LariFariCZcams xD. Thanks for your response Lari! Very kind from your part. In my case I have pretty much the same values you have, so that value should be ok. I'll build the circuit and measure it. Regards!
I'd like to know more about your panel saw. Did you build?
Yes, i built it some years ago. It is such a pleasure to work with.. I have a Video online.. Go to my channel and search for "homemade automated panel saw explaned"... There is also a Video online, where i explane the circuit in detail... Several people around the world rebuilt this saw in the last years... Greets from Germany.
Hi Larry, in your wiring diagram there are Neutral and Line, what if they swapped? Because we dont know which N and L in every electric socket. Thank you.
Dont worry. Because it is AC, it does not matter. We over here in Europe can plug in our 230 v plugs ether way round. Our houshold sockets are not polarized. The only thing you have to keep in mind is, that relais will eventually switch the N instead of the L. But if you not having suicidal tendencies, you should not fumble around on elektronic tuff, which is pluged in to mains, anyway... xD So this circuit will work, no matter which way round you connect it up... By the way... because i had some questions on that...the order is: Power plug --> switch --> soft start module --> Motor / load. Greets from Germany.
So I got a makita soft starter module want yo add it to my dewalt table saw how do I go about wiring it up.
I dont know the Makita soft start module, but i assume, it gets wired between power switch of the saw and the saw motor. Because i think, it does more or less the same like my simple version here...But maybe a bit more advanced... with microcontroller and triac..
Hi Lari. will a 220v motor controller module do the same? also act as a soft start cirduit? thanks for the video. keep safe.
I am guessing you talk about a phase angle controller. Yes, it would do the same thing. Even better. You could ramp the duty cycle from 0 up to 100% in a defined "startup time", as well as in a defined "startup curve" ....All you need is a arduino, attiny or some other cheap microcontroller and a ready made AC dimmer module like this.
de.aliexpress.com/item/32802025086.html?src=google&src=google&memo1=freelisting&albch=shopping&acnt=494-037-6276&slnk=&plac=&mtctp=&albbt=Google_7_shopping&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&albcp=12554800262&albag=127990761348&trgt=1284054470089&crea=de32802025086&netw=u&device=c&albpg=1284054470089&albpd=de32802025086&gclid=Cj0KCQiAzfuNBhCGARIsAD1nu--RdH2mSyYILRisfb7YA_gWVVZ2f4r3AyNWwPNrX8hUEgOD86NobqkaAinPEALw_wcB&gclsrc=aw.ds&aff_fcid=65c6684b6f6949cdb5b453acc9bdd5bb-1639906254613-09708-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=65c6684b6f6949cdb5b453acc9bdd5bb-1639906254613-09708-UneMJZVf&terminal_id=31954d0fc749441a856e15b8c7ee427e
There are lots of code librarys out there for the task.
Such a solution would be much more advanced but also more complex then the very simple circuit from this video.
Maybe i will do a follow up on this subject and make a video on microcontroller based startup / AC motor controlling.
Greets from Germany
@@LariFariCZcams thanks Lari for the reply. basically it is a light dimmer that i have that uses a mosfet. i connected the dimmer to my drill before as a test. it worked on the drill. hoping it will also work on my 1400w circular saw. crossing my finger though. i will be waiting for your video using a microcontroller chip. keep safe.
@@newvaper3794 ohhh..be aware..I dont think, the light dimmer uses a Mosfet...i think, it is a triac.... But anyway....such dimmers are made for loads up to 600 Watts. Chances are high, that you will fry it, by hooking up a 1400 W circular saw to it. But there are such dimmers for high currents available on e bay..( 3000W and more) they cost a few bucks.. Or you make your own. All you need is a beefy triac, a diac , a potentiometer and some resistors... I think it can be done with salvaged parts from scraped houshold appliances...
Thank you for sharing your circuit. Amazing how you simplified it. Wery clear explanation of parts of circuit. I'm in US and will need to build 120v version but I never build single thing for electronics. Would same circuit work for 120v and handle 24A if I replace your diode P600K with diode that can handle more current ? Or will I need to modify more components please ? By the way I love your channel name :-)
The answer is hidden somewhere here in the comments... If i remember correct, a brasilian guy redesigned the circuit for 120 Volt and posted all component values here.. The diode is good for universal motors. If you want to softstart a inductive load, like a transformer or a induction motor, you should use a high power resistor instead. (value somewhere in between 1 and 10 Ohms).. or you make your own inductive ballast, like i did on my table saw build.
@@LariFariCZcams Thank you for reply and tips. I saw the post of guy from Brazilian guy. I'm planing to use it on RV air conditioner compressor. I'm guessing that compressor
may be inductive load.
Ok.. Build the circuit first and make sure, the relais kicks in with some delay.. Somewhere in the ballpark of 1 second...Then add the diode ( or several in parallel for more amps).. Or even better....try to put the diode in series with your load first.. To see, if your load wants to start up in the first place..If not, try a big resistor (somewhere 1 to 10 ohms).. If the load does not run with a diode and a resistor in series, you will need a indctive ballast...You can make the ballast by yourself.. Go to my video "homemade table saw Pt 4" Minute 12:06.. By winding the wire around an steel core, you can get away with a smaller version and less wire.. I used thes 200 meters of wire because they come coiled in a box like this already. I had enough room in my junction box, so i did not bother and i used them, like they came out of the box... Lazy mans solution. xD The ballast softstert is big, but almost industructable....even in case of a dead short.... This is the german style of building stuff ;)
@@LariFariCZcams This is amazing. Thank you for all help. I will build it and report back.
cool !!!
Hallo Lari Fari! Nette Schaltung! Eine Frage hierzu: Sehe ich das richtig, dass die Verzögerungszeit bereits zu laufen beginnt, sobald am Eingang Netzspannung anliegt? Wäre problematisch, wenn man mit einem großen Winkelschleifer arbeitet, welcher keinen Sanftanlauf hat und diesen als Last an deine Schaltung anschließen würde. Hätte sowas im Sinn wie z.B. einen kleinen Zwischenadapter im Gehäuse mit eigenem Netzkabel und Schukokupplung am Ausgang.
Ja, genau. Die Zeit läuft, sobald du Saft drauf machst. Das Ding also deinem Winkelschleifer, der einen eigenen Schalter hat, vorschalten, wird nicht funktionieren. Und so klein wirst du die Schaltung nicht hin bekommen, dass sie noch im Gerät Platz findet. Winkelschleifer mit Sansftanlauf hatten früher einen zweistufigen Schalter. Heute ist da ne Platine drin..alles SMD. Traust du dir zu, sowas Kleines zu bauen? Ansonsten kann ich in dem Fall nur raten, einen Winkelschleiferschalter mit Sanftanlauf als Ersatzteil bei ebay zu kaufen..(zb für Makita oder Bosch) und dann versuchen, das Gehäuse etwas "anzupassen"..
Hello, Lari
I liked the practicality and simplicity of its circuit.
What changes should I make to 127 volts?
Grateful
You can use the circuit as it is also for 120 volts AC. I think, it should work, because the capacitive dropper limits the current, not the voltage. If you dont want to do math, start with a 220nF capacitor and increase the value, if your relais gets not enough juice. Stay as low as possible, or the Zener diode will get way to hot. The electrolytic capacitor sets the time delay...All of this depends on the propertys of the Relais...how much current it needs to kick in. And be careful, even though, there is 24 Volt at the "secondary" side, everything in this circuit is live mains voltage and can give you a nasty shock. Greets from Germany.
@@LariFariCZcams
Perfect!
Thank you so much, Lari!
I will follow your recommendations for sure!
A big hug from Brazil!
@@claudemirvernini6719 You should measure the Voltage present on the Relais. In the circuit from the video, the Voltage on the Relais, when its on, is 19,5 Volts. As i saied, i am using a 24 Volt Relais, so its a little bit undersupplied, but thats just to be on the save side... I did test the Relais first with my benchtop power suppley. It kicks in at around 12 Volts. You should try, to stay a bit under the Zener Voltage, when the Relais is powered...(by choosing the right dropper capacitor)...so you can be sure, the Zener Diode does not get hot... Sty save, my friend..
@@LariFariCZcams Thanks for your attention, Lari!
I will follow your advice.
Excuse me if I annoy you.
Hug!
@@claudemirvernini6719 No Problem Claudemir...I am curious to see, if my circuit works on 120 Volts and what changes the design need to work in your country. So, if you are building the circuit and you get it to work on 120 Volts, please give me a feedback.
hi can i use it for compressor refrigerator .. thanks
Yes you can...but normally, there is a built in soft start in every refrigerator compressor.. a PTC type divice.. You should check, if the PTC softstart in your refrigerator is malefunctening..
nice video ,
I was wondering if this circuit works even if fed with the "biphasic" output from an inverter with pure sine wave , this circuit in good substance decreases the inrush current ? thanks
Hmmm.. Never tried it, but i see no reason why it should not work... I mean, the diode just cuts away one half of the sine wave..And you could also replace the diode with a power resistor if needed..
@@LariFariCZcams Power resistor with what features ?
But in series with the diode ?
@@albertotorcoletti7006 Some appliances dont like the chopped off sine wave, created by the series diode.... If thats the case, put a power resistor into the circuit instead of the high power diode... The value depends on the electrical properties of the device, you want to soft start...For a "classic" application like an angle grinder or a scircular saw, (about 1500 W) the value is somewhere between 2 and 15 Ohms and at least 50 Watts. (the resistor is in series with the load for just 1 second).. In the end, it takes some experimetation, to get the behavour of your appliance just how you want it.... I hope, that makes sense. :)
Why not make an over damped lc filter?
Sir may i ask is the diode p 600 k can handle 800 watts 6 ampere i'm i correct sir tnx
800 Watts at 6 Amps? Is the grid voltage in your country 125 Volts? Yes, the Diode can handle that, because it is under load for only 1 second. But if you want to build the circuit for 125 Volts, you have to change some part values. There was one guy from brazil, who did it already. He posted all the necessary changes here in the comment section. His name is Claudemir Vernini.
Is the inrush current cut in half? Or by what % reduction can you figure with?
Yes, it is half the current, because the diode cuts one half of the sine wave. If you use a Resistor instead of the diode, you can determen the current reduction by yourself... Typical values are somewhere between 1 and 10 Ohms. I made myself a wire wound shunt for my homemade table saw.. Check the video out.
@@LariFariCZcams thanks for the reply
Great explanation sir. But please could you explain the relay circuit for me, I don't understand if the doide is connected to the Nc or No and where the output of the L is connected to, thank you 🙏
The Diode is in series with your load. I put it in the "hot" wire L..but you coul put it also in the N wire.... The Diode lets current flow just in one direction...Therefor the Load / Motor gets just one half of the AC and runs on half power. The relais shorts the diode after a delay time (1 second)... Then all the current flows via the relaiscontact to the load == Load / Motor 100 %... If you want, you can experiment by puting a diode in series with incadecent light bulb...It will light up about half brighness.. One word of caution: be sure you use a diode which can handle the voltage and amps...at least for a short time..
Thank you
will this work for old compressors?
Yes, it will. I think, your compressor has a induction motor. You will need a low value resistor instead of the Diode.
Watch my video "table saw part 4" I used 200 meters of insulated, solid core wire as a startup resistor for the 2,2 kW induction motor.
Hi Lari. Can I use this circuit for 220 volt AC? If not, then what need to be change
Yes..we have 230 Volt AC here in Europe.. so...yes, this circuit is for fine for your needs. Where are you from? Greets from Germany.
@@LariFariCZcams hi Lari. Thank you and I will try. Best regards from indonesia.🇮🇩🇩🇪
bro,. may i change diode 4005 to 4007, and u have another alternative of 600v diode? tengkyu...🙏
It depends on the load you want to soft start. The 1N4007 is a 1A, 1000V Diode...as far as i remember. You can try to connect 3 or more of these Diodes in paralell, to get the required amp rating. Or you look on the junkyard for an old computer power supply. The often have a beefy diode on a heatsink built in. (TO 220 package). Instead of the diode, you can also try a power resistor (less than 10 ohm).. Greets from Germany.
In use with an induction motor that has a start and run capacitor, do I need to bypass or remove the START cap?
A diode in series will not work on a induction motor.. Use instead of the diode a low value resistor. Somewhere in the region 1 to 10 ohms...or even better, a wire wound ballast. Like i did on my table saw build.
Ah ok. Thanks for your help. I was trying so many ways with a NTC thermistor, but was unsuccessful.
If I have an inrush of say 20A on a 240VAC motor, does it make sense that a 10ohm resistor needs to handle almost 5kW?
A induction motor needs the full sine wave to operate.. So you have two options.. Using a resistor instead of the diode or a inductor.. The resistor / inductor needs to handle the high current just for 1 second, then the relais kicks in and all the current goes through the relais.. In my table saw build, i made my own soft start ballast coil out of 200 meters of installation wire.. You can build a smeller version with 50 meters of copper wire and a iron core. Watch the video "Table saw pt 4" to see what i mean. If you want to use a resistor, 10 ohms would probably be to high.. less the 5 ohms would be more suitable for such a high inductive load. There are a lot of variables involved and it needs a bit of experimentation to find the best value for the task.
Excellent! Thanks for your knowledge. Yes, I found your video and saw the inductor you made 😁. Ok, I have a 3ohm 10W resistor that I'll try.
Thanks so much
Awesome video! So nice I have to make one. Only thing is for the hard of hearing like me the music makes it hard to make out your narration.
Ok..I will take that in consideration, when i do the editing for my next video... Greets from Germany.
Im looking at building this for 120v like Claudemir has detailed but keeping the 24v relay. Does this part list check out?
1x) 1A axial lead fuse
2x) 470K resistor
1x) 330nf X2 capacitor
4x) 1N4005 diode
1x) 2200 uF capacitor in place of 470uf (to get a 1 second delay)
I think it would make more sence, to go for a 48 Volt relais, because it takes less current to get it going.. The capacitive dropper limits the current, not the voltage..(simplified).. Your list is more or less ok. The 330 nf capacitor could be a bit low for 120 volt... Try to stay below the Zener voltage, when the relais is activated, so that it does not get hot.(by tinkering with the value of the dropper capacitor).. I am working on several big projects at the moment and have no spare time on hand to make tests and modifications for 120 volts on the circuit. Would be nice to see, if you are able, to get the circuit going on 120 volts and what kind of modifications you come up with. ;)
@@LariFariCZcams Thanks for taking the time to give feedback. I am not sure when I would build this. The next step for me is to work on a schematic and learn to calculate the proper values.
@@richiem9316 Oh, yes, there is a way, to calculate the proper values, but therefor you have to know, how many mA your Relais draws. Personally...For such small circuits i am faster to slam some components together on a breadboard and test it right away... I know, breadbords are not ment to work on 120 Volts or more.. xD
Hi. In my project AC voltage before bridge is only 12v and after bridge is 9v DC.. How to get more to power 24v relay? I been use parts like on move. Any help welcome.
Make sure, that it is a 24 Volt Zener diode in your circuit..If the Zener diode is correct, your relais wants to draw more current then mine... Try a bigger dropper capacitor. 470nF instead of 330 nF.... Or even higher, if you have a big Relais.... Dont get confused, the dropper capacitor limits the current, not the Voltage.. The Voltage, which you get on your Relais is the sum of how much load you connect to this "transformerless power supply"... So if you remove the relais and the Zener diode, you will get about 320 Volt DC out of the bridge rectifier...(unloaded). No matter, what value you have for the dropper capacitor. Once you burden the circuit, the Voltage will collapse and settle at an equelibrium point... Thats, where the Zener diode comes into play... It clamps the voltage down, if the Relaiscoil gets damaged and out of circuit...It protects the Electroloytic capacitor, because this cap is not made to handle 320 Volts. In my circuit i ended up with 19 Volts on the relais... That means, the Relais works, without getting to much Voltage and the Zener diode has nothing to do, because it is not conducting at 19 Volts.. So the Zener diode acts as a "crow bar circuit" it will conduct just in case of Relais failuer and blow the 1A fuse intentionally... It is a safety measure.. Short story long... increase the value of the dropper capacitor until the voltage is enough to power the Relais. Measure the voltage, when the Relais is on. It should stay a bit under the rated voltage of the Relais. This is fine and extends the life of your Relais.... I hope, all of this makes sense for you.. xD And you will get the thin running. ;)
@@LariFariCZcams Thank you for answer. I recon when relay is not connected output voltage is 24.8v .When i plug relay its works , hold connection but voltage drop to 9v. When i try start with relay connected den voltage cant build more then 9v. So I susspect my relay needs more current. I'm right ? His resistance is 540 ohm. Needs try bigger capasitor.
Yes, try a 470 nF capacitor or higher if necessary...@@krzysztofwojcik108
All done. Fix my problem with replace a relay with another one. Same as yours. Soft start works fine. So in my case problem was with too big relay. Thanks for support.@@LariFariCZcams
Hi,can you post links for relay and orange capacitor.Thanks
Yes..
Here is the Relais: www.digikey.de/de/products/detail/te-connectivity-potter-brumfield-relays/OZ-SS-124LM1-200/1427513
But any somewhat similar 24 v DC Relais would do just fine..
And here is the dropper capacitor:
www.digikey.de/de/products/detail/vishay-beyschlag-draloric-bc-components/BFC237341334/502562
..but, again...any 0,33 microfarad capacitor will do, as long as it can handle at least 250 Volts.
All these items are very cheap and / or can be "rescued" from electronic scrap...
@@LariFariCZcams I forgot to ask link for Z24V and 1A fuse. Is 470uf capacitor 400V or something else?
Also do you maybe have photos of both sides of board? Thank you very much
The capacitor is a 0,33uf / 275V AC ..You can use any "non polariced" capacitor which can handle minimum 250 Volts AC. (i am assuming, your grid voltage is 230 Volts)....so a capacitor with a 400 Volt rating is a good choice. The capacitance value depends on the amount of power is required to drive the relais... A bigger relais needs more "juice" to kick in and therefor a higher capacitor value. If the 0,33uf (330nf) capacitor is not enough, you can go higer to a 470nf or even more. But if you go to high, the zener diode will get hot...so dont overdo it, there is a sweet spot... ;)
The fuse is a "normal" 20mm x 5mm Version on 2 fuseclips.
But again, you can choose any other formfactor...lets say for instance, you want to mount the fuse into a frontpanel. Then you need the appropiate fuseholder for the task.
I have used in my circuit a zener diode, which is rated for 1,3 Watt.
But going higher would be in this case always a good idea.
Here is a link:
www.digikey.de/de/products/detail/onsemi/1N5934BG/1474304
Give me your e mail adress and i will send you closeup pics of the circuit board.
@@LariFariCZcams there is email address on my profile,because yt is deleting comment when I write it here
it can use for 1hp single phase ac motor?
Induction motor or universal motor?
induction motor for shallow well tank
can i have your diagram clearly sir🙏🙏🙏
For induction motors you can not use a diode. Replace the diode in the circuit for a high power resistor about 1 to 5 Ohms.. Or a better solution would be a "ballast"... On my homemade table saw, i used 200 Meters of copper wire as "start ballast".. The ballast is big, i know, but it is built, to last forever... Thats how we germans like to muild stuff.. Go to my video "homemade table saw Pt 4"... Minute 12:05.... And give me your e mail adress, i will draw a diagram for you.. Whats the grid voltage in your part of the world? 120 or 230 Volt?
I try with my 2.2kw motor but I have problem, when current going trough diode, motor doesn't rotate just buzz and jump around, any suggestions?
What kind of motor is it? This circuit is ment to work on universal motors. If you have a induction motor, use a low value but high power resistor instead of the diode. ( 5 ohms or less)
@@LariFariCZcams Thanks for answers 🙏 yeah it's induction motor, I will try with resistor, I have 100w 3.9 ohm
@@milanmilicevic4618 I remember, about 20 Years ago, i had a table saw with such a motor. I used a 1,5 kW heating element from a washing machine as a startup resistor...Since it is on for just 1 second, it works even in dry environment.... The irony is.... at the momnet i am working on a new table saw project..(upcoming video)..it will have a 2,2 kW induction motor and the same soft start, as back in the days.... Sometimes i feel, i have been gong round the loop.. xD
@@LariFariCZcams here where I live, we don't have city's water pipeline, we all have big water storage and some natural water source, and I'm using 2.2kw water pump with 200L expansion tank to get 50-90psi in house pipelines. That motor goes bad every few years but I think that soft start will help to improve motor lifetime. What do you think about arduino triac/diac soft start? Do you think that can work with induction motor, if you keep full positive and negative sine wave just shorten a bit 🤔
@@milanmilicevic4618 Huuuh..a simple phase angle controller would not work on a induction motor. What you need, to do a soft "ramp" , is a VFD. It can be done with arduino (microcontroller) and some IGBTs, but i never tried to build my own VFD, because the parts would cost me more than a ready made one... On ebay a VFD for 2,5kW costs under 100 Euros.... at least here in Germany. A more "maker friendly" approache would be, to use an Arduino and several start up resistors. Starting this motor in 3, 4 or even 5 steps in sequence would do definitely the job....It would get bulky, but i dont think, this is a problem in your application. Another qestion: Can you tell the reason, why the motor is passing away every so often? Bearings? windings? motor capacitor? Does the motor has a centrifugal startup switch built in?
Memasang Dimmer Rakitan Sendiri
Adalah kepuasan tersendiri, karena kita mengerti dan memilih komponen triac yang tepat kita memaksimalkan peruntukan alat tersebut. Apalagi alat tersebut di samping untuk Alat softstart ternyata juga bisa melakukan penghematan pemakaian listrik rumah. Beberapa alat penggerak motor & elemen pemanas yang biasanya untuk kebutuhan rumah tangga dengan kapasitas mampu menahan beban 4000 watt :
1. pompa air
2. Mesin cuci
3. Blender / Mixer
4. Pemanas Air / setrika
5. Penanak Nasi
6. Mesin Bor / Gerinda
Saya coba pakai microwave 1100 watt ternyata juga mampu biasanya jeglek walaupun listrik PLN 1300
** tidak bisa digunakan untuk keperluan mesin las listrik**
** saat memakai alat dimmer usahakan di posisi kan potensiometer meter kondisi minimal ( Rendah) kemudian atur potensiometer sesuai kebutuhan **
Lebih detail mengenai Dimmer Speed control dan Skemanya silakan lihat Deskripsi pada link CZcams :
Komponen Triac BT 137 saya lihat data sheet nya 8 A jadi saya pakai 2 biji untuk mendapatkan kemampuan menahan daya 4000 watt atau bisa juga cukup 1 biji komponen Triac BT 139 data sheet nya 16 A atau setaraf dengan 4000 Watt.
czcams.com/video/BEMn9zsWcdQ/video.html
what are the calculations if i want 2 second start time instead of 1 second ?
double the capacitance of the electrolythic capacitor.... (timing capacitor)... It depends on the kind of relais you use... You have to find the right value by trial and error..
@@LariFariCZcams for more precise activation of the relay, shouldn't we put some kind of transistor, and the timing capacitor controls the voltage of the transistor gate instead ?
Yes..this would be "the next level" ;) The circuit in the video ist the most simplest, you can get away with... There are lots of ways to do it... You can use a Transistor circuit, an 555 Timer IC or even a small attiny microcontroller.... But in the end, it is what it is...a simple soft start.. In most cases it does not matter if the relais kicks in after 1,5 seconds or 1,8 seconds... ;) The nasty inrush current spike occurs in the first 0,5 seconds...At least in the application, which it is designed for...starting motors or transformers..
@@LariFariCZcams one more think, when selecting the appropriate relay that can withstand the load, should i consider that the load is inductive load ? because relay are rated for resistive loads and have about halph its original rating if used with inductive load
Yes, would be good practice to go with the relais about double the "run" current... My table saw pulls in operation about 10 A @ 230 Volts... I used a 25 A relais for tis machine... So far no problems... Its not the inrush current, what harms the relais contacts. It is the spark, when you turn off your device.. A 100nF 400V capacitor in parallel with the relais contacts can also help, to qunch this arc. Than, your relais will last longer..
Can we Run refrigerator compressor on it?
Hi, my friend.... Hmmmm...most refrigerator compressors have already a PTC start circuit built in, because a refrigerator compressor starts on full system pressure. So if you have problems with your compressor, you need to change this component. (cheap on ebay). If you have some other project in mind, where you want to use a "hacked" fridge compressor, i think, you can use this circuit. But dont use a diode... Use a high power resistor (about 5 ohms...you have to find the right value..) I never tried to use this circuit on such a compressor and i would be curious to see, if it works. It is so simple to build, so it is worth a try anyway.. ;) If you do so, please leaf me a comment, if it works or not. Greets from Germany.
@@LariFariCZcams Thanks dear for you reply, actually the problem is when refrigerator compressor start it's take upto 10 times more power. I want to run it on Small solar inverter of 1.5kw..
My solar inverter max 5Amp out put. If i run refrigerator on it maybe my inverter die🤣..
Uh..thats tricky... My suggestion: Make the wires on the input side of the Inverter as short + thick as possible (battery cable), to reduce the voltage drop on DC side of your system. I dont think the Inverter dies, but it will detect a overload situation and the protection kicks in.. Probably you would be better of with a bigger Inverter.
@@LariFariCZcams Hmmm. Ok but there are electronics circuit in market to perform this. I don't know what they are using in this kit. But it's work.i think Your DIY project is same , anyway I send you a link please if you have time just watch.
czcams.com/video/p2K0ptvYb6Q/video.html
Or you can search easy soft start in CZcams
You can make for DC power
Hi, TJM... I am already working on a simple softstart circuit for DC motors. A video about that topic is coming soon... Greets from Germany.
@@LariFariCZcams ok thanks you
Thanks for your sharing of material. Would you consider providing a scaled up version of your circuit to fit my application?
I want to reduce inrush current of a 10HP AC Motor; Single Phase; with approx 31.67 run amps and potential surge at three times the run value at approx 95 amps.
If you could provide this, it will be appreciated. Thank you!
7,5 Kw singel Phase? On 240 Volts? Where the hell do you live?.. You could practically use the same circuit... Just use the Relais to switch a bigger contactor, which can handle your motor current.. And instead of the diode or a power resistor you could make your own inductor coil...Like i did in my Table saw build.. I used 200 Meters of copper installation wire..This solution takes up some space but is simple and robust... almost indistructable...even in case of a dead short.. Go to this video..Minute 12:00.... czcams.com/video/b2LhjqxPc8Q/video.html
2 step soft Start
Could you sell me one for a 4 HP power? I want to soft start a motor?
KIT POWER SOFTSTART BELL BGR SOFT NTC
Alat ini berfungsi untuk membantu meringankan tarikan listrik power pada pertama kali dinyalakan sehingga tidak membuat MCB / sekrinh rumah anda turun.
Keunggulan :
- peredam sesaatnya dengan NTC
- High quality component
- tegangan relay stabil
- rangkaian simple
- terdapat soket ac
• Tidak membuat MCB rumah Turun
Saat menyalakan perangkat Audio power Amplifier, Motor gerinda, mitter circular etc
• Menahan spike arus sesaat saat beban berat (trafo besar) dinyalakan
Beli di toko online seperti Tokopedia
Berkisar Harga 50.000
Soft start dengan kawat nikelin
czcams.com/video/W2cudrZmLTk/video.html
Memasang Dimmer Rakitan Sendiri
Adalah kepuasan tersendiri, karena kita mengerti dan memilih komponen triac yang tepat kita memaksimalkan peruntukan alat tersebut. Apalagi alat tersebut di samping untuk Alat Anti Jeglek ternyata juga bisa melakukan penghematan pemakaian listrik rumah. Beberapa alat penggerak motor & elemen pemanas yang biasanya untuk kebutuhan rumah tangga dengan kapasitas mampu menahan beban 4000 watt :
1. pompa air
2. Mesin cuci
3. Blender / Mixer
4. Pemanas Air / setrika
5. Penanak Nasi
6. Mesin Bor / Gerinda
Saya coba pakai microwave 1100 watt ternyata juga mampu biasanya jeglek walaupun listrik PLN 1300
** tidak bisa digunakan untuk keperluan mesin las listrik**
** saat memakai alat dimmer usahakan di posisi kan potensiometer meter kondisi minimal ( Rendah) kemudian atur potensiometer sesuai kebutuhan **
Lebih detail mengenai Dimmer Speed control dan Skemanya silakan lihat Deskripsi pada link CZcams :
Komponen Triac BT 137 saya lihat data sheet nya 8 A jadi saya pakai 2 biji untuk mendapatkan kemampuan menahan daya 4000 watt atau bisa juga cukup 1 biji komponen Triac BT 139 data sheet nya 16 A atau setaraf dengan 4000 Watt.
czcams.com/video/BEMn9zsWcdQ/video.html
doesn't it broke the power tools ..lari??
No...not yet. I upgraded my table saw with this circuit about 8 years ago. No problem so far. But you should be careful to add a circuit like this to a power tool, which has a speed control electronic built in. In such a case, you should not use a diode. Use a power resistor instead.... If your power tool has "just" a universal motor and a switch, you are good to go with this circuit. Because a universal Motor runs, as the name applies, on AC and DC. Hooking up a half way rectifier in series for a brief moment does no harm..
@@LariFariCZcams no speed control, only motor induction and switch😁
ohhh yeah, the VA maks. capacity of this electronic??
so so clear explanation.. lari
tenqyu...👌
@@lurkingcorsa10 You can use this circuit for AC power tools with universal motor up to 2500 Watt. It depends on the kind of relais you use in the circuit. I used in my case a 24 volt Relais with 900 Ohms coil resistence. If you want do upgrade the circuit with a bigger relais, you need also a bigger dropper capacitor. ( 470nf.......680nf......or even higher).. Maybe you can explane a little bit, what kind of tool / Motor you want to soft start with the circuit...
@@LariFariCZcams okkk ..
and the last,. what about the torque? does tge power tools get lost a little torque through this circuit.. lari?
@@lurkingcorsa10 No. The Tool starts with half power and torque and after one second it switches to full power and full torque. No losses...
Isn’t that clever?