How to set amps on driver?

[Greolt]

Ok I read posts all about RMS an peak. Square wave moving to sinusoidal at higher RPM.
All went over my head

On the drives that came with a kit from China amp setting is done with a trimpot. Microsteping is set with dip switches

On Lou's sugestion I put my multimeter in series with one phase of a bipolar setup.

Then jog-stepped one microstep at a time till the amps peaked on that phase and adjusted the trimpot to the amps I wanted.

Is this the right way to do it?????

Next question

Repeated requests to China for info on the motors has been a waste of time.
No markings of any kind on the motors.

Looking on the Kellingnc website for motors that match the physical size and wire count I have come up with these assumptions.

Nema 34, eight wire, bipolar series, 3amps/phase

Nema 23, four wire, 3amps/phase

Does this sound like good assumptions or am I way off

Any clever people out there that can help me out will be much apreciated

[ger21]

There's no way to guess the current rating based on size and wire count. I've seen PacSci motors of the same size and torque available with 6 different current ratings.

[pminmo]

You should have information with the drive as to how to set motor current. Usually there is a reference voltage that you adjust and measure via a simple dc voltmeter. You method has issues.

[Greolt]

Thanks Gerry and Phil

I suspected that would be too simple.

I tracked down a PDF on the drive (thanks PatrickM) and this is all it had about setting amps.


"The driving current can be adjusted from 1.0A to 4.3A infinitely. The current will go down when clockwise rotate
the adjustable resistor; and the current will go up when counter-clockwise rotate the adjustable resistor."

Nothing else. What do you sugest?

[pminmo]

Post the pdf, and maybe we can help.

[Greolt]

Phil

The PDF is over the 2 meg limit.

I have read it through six times and the only mention of setting amps is exactly as I quoted.

It is very brief and written in Chinese-English. Looks more like a sales brochure than a tech document.

Thanks anyway, Greolt

[James Newton]

http://www.sxlist.com/techref/io/stepper/wires.asp may help figure out which wire is what. I would expect that some way of meauring the coils must be available that would allow one to compute the other ratings, but I don't know what it is.

[Greolt]

James thanks for that.

I figured out the wires and have the motor connected and it goes no problem.

What I was hoping to do was set the amps to the correct level on the driver.

Mostly concerned about the first question.

[pminmo]

There maybe be some clues even where it's not directly mentioned.

[Greolt]

Phill

This is the link that Patrickm kindly provided for me to the PDF.

Should have remembered this when I first tried to upload the PDF

http://koeienuiers.nl/document_libra...otordriver.pdf

I am convinced that you won't find any thing helpfull but I would love to be shown up for a fool

Thanks for taking the time with this

[pminmo]

Well, I can't see it either. I'd contact the mfg.

[Greolt]

Well that's my problem isn't it I've asked the manufacturer for this info on so
many occasions that it appears hopeless.

Thanks again for taking the time Phill. I appreciate it.