VFD's and 3phase Induction motors FAQ corner / pls. Read all first

So you can choose what voltage you want to operate with at home? Thats a very nice to have!

Speedy is very smart! He does have a weird way of explaining things sometimes, but at least he's explaining things.

Congrats at finding your VSD Tom. Great stuff!

Cheers

FarmBoy,
Residential - We have our mains coming in as 230V, Single Phase - In our Main Panel - we "leg off" to get the standard 115v for most everything electrical in our homes.
A/C, Electric Stoves, Electric Clothes Dryers, Heat Pumps, are always 230V. If you have other needs, such as a 230V air compressor / some pool electrics / well any other 230 v items, you have it at your disposal.

SOME massive homes CAN have 230V 3 Phase coming in - BUT it is "out of this world" in pricing. Most all of your industries have 3 phase, 460V Supplies (and higher) coming into their Massive Power Boxes.

@speedy is indeed an electrical GURU - and you just have to take the time to learn Speedys' "ways"........once those are learned, you Never have a problem....Here in US, he would be termed a heck of a "Rascal",
which is a GOOD thing.

Keep truckin' FarmBoy...we all are learning so very very much in this thread.

Tom

PS - I'm elated with having the correct VFD's purchased....."me" don't have to worry about that anymore.

Thanks for explaining that!
230VAC single phase is it for our residential areas in RSA.

Absolutely right about speedy. My intended once off question turned into a book. He is doing a great job teaching! Please do keep it up @speedy

@FarmBoy ... Wow ... that's who you are and what I'm talking about ... Since you're from South Africa ... So you're a "Raw piece of diamond" ... Stubborn in construction that needs more pressure to grind " If you accept that and I'll do more effort too" ... you have a lot of sparkling lights that points to a talented gifted technician inside you having a very important questions to tell about ... let me just Sharpen all your sides and see what comes out then ...
Be patient for weird things as I'm and don't move .

Please excuse my English as I'm mind translating my words and using Google for faster help .

I hope this will bring out more light ...

Speedy & FarmBoy,
I have an important question - very well thought out and "factual" -

???? Isn't Harmony Blissful???

Blessings,
Tom

Speedy and ALL,
Find attached the list of "Features" for my VFD - the list you posted with "check-marks" and asked IF I had any questions...........
I answered them to the best of what I could find.....please expound on these - (Please keep "bitching / ranting & raving" to a minimum)

Let's see if I got any of them right????

Thanks,

Tom

• Simple volts/Hertz control : that is the new advanced strategy that inverters use for controlling AC motors ... as the input side will be an analog voltage signal and the output side will be output frequency ... the older one is Scalar control ...
  
• Pulse Width Modulation (PWM) : that is the methodology of the internal control of each drive with additional modifications/stages in each model for additional features for speed control ... like modification made to the PWM to be Sinusoidal PWM and the additional vector control technology and its additional Feedback card ...

Hi Speedy,
In my .pdf, reply 106 - Were my answers fairly correct the way I answered them??
Thanks so much,

Have a blessed one,

Tom

Hi,

I want to use two servo motors in my first 2 dof sim, I bought already arduino uno r3 board and I read that it is possible to convert pwm signal from arduino to 0-10VDC(my servo mitsu MRJ2S have 0-10 V input) but I also read that low pass filter RC is not good solution for that. Maybe someone already have solution? Thanks for any help!

A low pass filter is used to turn pwm into a voltage. I think you need something more along the lines of a non-inverting op amp to double the voltage output of the arduino to control your motors though.

@BlazinH Hi, I am presently getting information together to purchase a Delta AC servo and drive (400W) but am in doubt how to connect it all up. Your non-inverting op-amp solution has my ear. Any examples where I can find this to build? I have posted a thread of the gear I want to use to built this "power" servo to start with a 2 dof and experiment a bit to built to a 3 and more dof simulator. That is why I have chosen for 400 W so there will be enough power coming out of my one phase domestic outlet in the NL. Still struggling a bit whether I should go this route as these puppies are not cheap and if it fails well it will only be one as a pilot but still.

The RC filter introduces a small delay and if not matched for the PWM frequency you may have cut-off or clipping. Best is to use a real DAC output if possible.





PS. I was talking about AC motors since a year and a half now... no-one cared.
Speedy is talking about them a year after, and everyone is pissing their pants... Hmm... lol

@Martin van Hagen, There is an op-amp solution posted on this site somewhere but I don’t have one of my own to show. I’ve been a DC power user so far and have not required the use of one yet myself.

I agree that an RC filter may not be the best solution, especially for DIY’ers since the components used need to be matched to work properly with other components in the system. But, with the right components, it should suffice. I did not advocate for its use in my post above however.

Btw, why are you not considering a DC powered solution? Or are you? 400watts is still a small motor and a DC motor with a feedback device attached (pot, encoder, hall-effect) is a servomotor too! Then you won’t have any worries about how you are going to drive them either!

@tronicgr , You think you should be compared to the likes of Bill Gates, Steve Jobs, and Steve Ballmer because “no-one cared” about what you said? That’s got to be the funniest thing I’ve read posted on this site yet to date! Rofl.
Again, do you have points to share with some facts to back them up, or are you just confirming eaorobbie’s statement; you just like to stop by every now and then to gloat?

Gloat? lol... now that's funny. I'm trying to show people for the alternative options and I'm considered I'm doing advertising... I just like pointing out facts.

I have tried all possible solutions, DC motors (large,small, tiny), BLDC Servomotors, AC motors... I think I can speak of experience now and then... All these completed projects speak by themselves anyway.

Hahahahaha... who ME??? LMAO! Gates? Ahahahahaha... I just posted that funny photo, it reminded me of the situation here... LOL!!

Picard perhaps...

Here is another funny picture I see every time I visit here:

Lol... really?

Well nothing bad about the dead but why did I only recently realize that we owe a lot to persistence & perseverance of a gentleman with the name of Dennis Ritchie.

That just proves that no one cares about geeks or related matters.

@BlazinH reading your reply I am even more puzzled; I was under the impression that 400W in the DC world difficult to control was due to the H-bridges and the high currents. Then the Pac = Pdc = 400W each with their own characteristics. My plan is to build a power servo that will last with industrial components and reproduce in the quantities required to develop myself from a stage 01 2 dof race simulator to a stage 4, 6 dof sim. I have 3.2 kW available before the MCB in my distribution board "pulls the plug" leaving me with darkness. I agree that at present the path of DC servos will be easier.... but then with a bit of ingenuity and help from the Oracles on this forum we might be able to do something out of the box
I was thinking about Arduino and a PWM or 0-10VDC analog signal but then why not using the MODBUS of the drive and the PID controller and the feedback that comes standard with these power servos? It will be a learning curve for me to get it all up and running but I like to see it as a team effort as mentioned before.
I was reading up on this on this forum but lost my trail back to this thread.....

Finally why not an 230VAC 3phase Servo and if not why an standard 230Vac 3phase motor else 12 Vdc....