Rectifier Basics for SCR & Variable Transformer Treadmill Motor Power Supplies Convert AC into DC

[@BL-lo3eg]

Hey, man I know you have much better things to do with your time. I really appreciate you taking the time to help this dummy out. Although I did get it through some trial and error, I fortunately had the circuit breaker on there because you said it needed to be there. You were the only one breaking this stuff down in a way for me to understand how to do this conversion. I appreciate all the help you put out there. Thanks man

[@dazecars]

I am happy to help!!!

[@bill4639]

@@dazecars When you say "power supply" what exactly are you talking about? I want to supply power a DC treadmill motor with 120V AC wall current.

[@dazecars]

that is what a power supply does. It takes 110 AC power and converts it to something else. I have tons of videos on my channel on how to power treadmill motors.

[@Mote78]

Sorry for this late comment, but is circuit breaker connected to the power source then to the rectifier in feed? I want to verify that this iscorrect.

[@dazecars]

I put the circuit breaker between the power supply and the rectifier so that if the rectifier fails it trips the breaker instead of burning up the power supply

[@davidnolan52]

In addition to a top rate explanation I really enjoyed the humor! I'm really glad I saw this new video as I am wiring up my power supply today. Thank you, You're AWESOME!

[@dazecars]

Glad you enjoyed it!

[@paulmanhart4481]

Love your sense of humor Daze. Like Charlie Brown’s parents talking in the background. P

[@dazecars]

👍

[@bostedtap8399]

Excellent point on circuit protection, circuit breakers trip far quicker than a general fuse, fast blow fuses can be troublesome in power circuits, anyone had experience of these. Great video thanks for sharing.

[@dazecars]

glad you liked it!!

[@MichaelJeffers75]

Another great application for bridge rectifiers is to convert cheap arc welders into DC Electrode Negative (DCEN) which almost eliminates welding spatter from flux core welds. There's lots of YT tutorials on it, most also using large capacitors, but I did the bare bones conversion with just the rectifier and now my janky 90amp 110VAC welder can compete with a good MIG welder.

[@dazecars]

Interesting, thanks for sharing

[@charleskutrufis9612]

This blew my mind, electrons flow negative to positive. I read some of the comments and someone pointed that out. Otherwise,as usual, a great video.

[@dazecars]

I found that interesting as well

[@virtuecare994]

great explanation!

[@dazecars]

Glad it was helpful!

[@babylon5952]

I have an SQL 100A 1600V bridge rectifier with 5 pins. The 3 on one side has a tilde mark on the pins and the other side has a plus & minus sign on the pins. I am trying to build a motor controller (using information from your video series and thank you very much for making those videos) for my drill press using a tread mill motor. I am not exactly sure how to wire it. Please help.

[@dazecars]

that is the wrong rectifier. It is setup for 3 phase. I believe you can still use it by only hooking up two AC wires on the AC side leaving the third unattached. Double check it with a meter before using it to confirm you have it hooked up correctly

[@gregburke8163]

Which line should the circuit breaker go on?

[@dazecars]

I put it n the hot side.

[@aguycalledlucas]

Another great video!

[@dazecars]

Glad you enjoyed it!

[@rcasatelli400]

With this setup do you run the inductor & choke ?

[@rcasatelli400]

using the Variable Transformer

[@dazecars]

it’s not required like on the scr. you should watch my mc2100 scr variac shootout

[@rcasatelli400]

​@@dazecars Thanks I did before .. I'm not a electric guy so I miss understood the words "Clean Power " I was running a treadmill motor with a SCR & it just quit so I am converting to use a variac . Thanks again

[@dazecars]

@@rcasatelli400 glad I could help

[@gg-gn3re]

6:32 other way around for electrons, they flow neg to pos

[@dazecars]

Thanks for the correction

[@morcha5107]

Why do you need an extra potentiometer if the Scr has one or am I mistaken?

[@dazecars]

The one in the SCR is oversized for most treadmill projects. Most SCRs come with a 500K potentiometer and for 110 usually 120K-150K is what is needed. You can use the 500K unit but you will need to turn the potentiometer 2/3 of its travel before the motor will come on which only leave 1/3 for total speed control. I use two different sizes of potentiometers for my projects so I have fine and coarse speed control. I cover all of this in this video kzbin.info/www/bejne/ZmXHYahnh6-sjtk

[@akshaytechnics10]

Sir my treadmill Moter 2.5 hp 180 DC volt and 10 A sir please tell me which rectified is suitable my machine to start my treadmill

[@dazecars]

this one amzn.to/3GjVCao

[@TradeWorksLLC]

I guess Im a little confused by what you’re referring to when saying “burning up your power supply” in the event the rectifier has a diode short. Are you referring to a SCR controller or possibly a variac?

[@dazecars]

Any AC power supply, Variac or SCR. when a rectifer fails it is effectivly like connecting the two power leads coming from the SCR together shorting out the SCR. Same would be true of the Varic

[@richbulger9710]

Hey Treadmill guy, question, I’m hooking up a 4 hp, 30amp treadmill motor for my lathe, I’m using all the components you are suggesting Larger rectifier, 20 amp breaker , potentiometer you suggested. I have a problem with the breaker popping as I turn it up, my wire plug in is 16 gauge, all my other wires are 12 gauge , or 20 amp rating. Do I need some kind of transformer to allow me to reach 30amps from a 110 house outlet? I think the motor is drawing more than the system can handle, thus popping the breaker. Thx Rich , great videos ! 11:10

[@dazecars]

I am running 25 amp motor on my lathe with no issues. First thing I would look for is a physical issue. Something binding, turn all moving parts by hand including the motor shaft. What is the RPM rating of the motor? are you using any gearing?

[@richbulger9710]

Just bench testing motor, no load on motor yet, checking rotation seems to be ok no drag, 4.0 hp, 4000 rpm, 90 volts, 30 amps

[@dazecars]

Are you popping the house breaker on the breaker in line between the SCR and rectifier?

[@richbulger9710]

@@dazecars popped the 20a breaker I installed in the wiring circuit to bench test the motor.

[@richbulger9710]

Does the 30 amp rating , mean it will draw 30 amp, that’s why it’s popping?

[@GeraldMcneill]

wondering if you can help me i bought the 4000 w scr speed controller and pack of 4 bridge rectifiers number 5010 to hook up to a treadmill motor so i tried it out on a little 18 volt cordless drill motor and the thing blew out a bunch of sparks ...i thought the rectifier was to bring voltage down to 12 volt ? so i didn't try it on treadmill motor didn't want to blow it out what did i do wrong ? i hooked 120v into scr controller and out to bridge rectifier to ac clip and parallel clip i seen it done a few times then motor to other 2 parallel clips and bang

[@dazecars]

The SCR controls volts and puts out between 0 and 110 V AC. The rectifier converts AC too DC. It is not a 12V converter. That SCR will be too small for a treadmill motor, you will burn the SCR up. Also your rectifiers are likely too small.

[@GeraldMcneill]

@@dazecars i seen the videos where they bought 10.000 and they said it was to big and they had to turn the knob over half way before the treadmill motor would turn they said 4000 would be a better scr and i'm gonna order the bigger bridge rectifier that you showed on this video but what scr would you recommend and Thank you for your reply gonna use the treadmill motor as a powerfeed for tablesaw

[@dazecars]

@@GeraldMcneill wattage has nothing to do withe potentiometer. Sadly there is a lot of misinformation out there. My channel has lots on this topic. Putting Together a QUALITY Variable Speed Power Supply or Treadmill Motor Controller SCR type kzbin.info/www/bejne/o2HGfaSBnJaVr6s Hooking up the Components for a Quality SCR Treadmill Motor Power Supply, Treadmill Motor Controller kzbin.info/www/bejne/iZuomH5-lLJ6fKc Changing the Potentiometer in an SCR Voltage Controller Treadmill Motor Controller Power supply kzbin.info/www/bejne/ZmXHYahnh6-sjtk

[@GeraldMcneill]

@@dazecars if i bought a 12 volt power supply could i avoid the bridge rectifier and do i buy 20 amp or 30 amp thank you in advance for all your help

[@dazecars]

​@@GeraldMcneill What are you trying to do? With a DC motor voltage effects speed. Yes you can power a 100V DC motor with a 12 volt DC power supply but it will be slow (relative to max speed)

[@2OO_OK]

Have you seen the KB electronics KBIC boards?

[@dazecars]

I have my concern with them is amps. Amps are directly rated to torque and their amp rating is well under the max amp rating of most treadmill motors.

[@ranjanroy6820]

Very nice👍👍👍👍👍👍 video thank you

[@dazecars]

Thanks for visiting

[@frankbrayford8194]

Hi, I have found your video's the most informative of all I've looked at here on yt. I followed your directions and completed a treadmill motor conversion on my lathe, it works flawlessly. TY I was given a motor and control board by a friend that has a completely different electrical setup. The board is a "B017D" and I do not know what I need or where I make connections to get this running. I would like to use it on my ban saw. Can you offer any help, you are without doubt much better educated in electronics than I. A google search on the board will give you a very good picture of possible connections I can use.

[@dazecars]

Glad you liked them. You might be able to hook a PWM to RXD and TXD inputs but I don't know for sure as I have not encountered that board.

[@suprigitar4133]

Very helpfully

[@dazecars]

Glad to hear it