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DRV8825 does not work

Posted by radus 
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radus
DRV8825 does not work
August 04, 2013 06:42AM
Hello.

I'm using DRV8825 on my Z axis with sanguinololu.
And motor turns choppy and noise.

What's wrong ? How to fix it?

drv8825 failed video
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492183
Re: DRV8825 does not work
August 04, 2013 07:52AM
Did you set the current correctly?
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radus
Re: DRV8825 does not work
August 04, 2013 08:53AM
I try change current to low and to high but not anything changed =(
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jamesdanielv
Re: DRV8825 does not work
August 04, 2013 09:57AM
are you usng full step? try microstepping at 16x or 32x
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radus
Re: DRV8825 does not work
August 05, 2013 05:34AM
On video first half is 1/32 and second half of video - 1/16 microstep.
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radus
Re: DRV8825 does not work
August 05, 2013 05:35AM
May be DRV8825 not compatible with Sanguinololu controller ?
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jamesdanielv
Re: DRV8825 does not work
August 05, 2013 06:06AM
isn't there also a sleep pin that needs to be pulled high?

[www.pololu.com]
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radus
Re: DRV8825 does not work
August 05, 2013 08:57AM
jamesdanielv Wrote:
-------------------------------------------------------
> isn't there also a sleep pin that needs to be
> pulled high?
>
> [www.pololu.com]
> le_id=0J590

It's new version md20b with resistor.

There are generally anyone have any good experience with these drivers?
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akhlut
Re: DRV8825 does not work
August 05, 2013 09:39AM
Try full-step. What Z-screws are you using?

- akhlut

Just remember - Iterate, Iterate, Iterate!

[myhomelessmind.blogspot.com]
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jamesdanielv
Re: DRV8825 does not work
August 05, 2013 12:50PM
just watched the video. it looks looks like your motors are not correctly wired. switch a with -a. this should invert one of the coils. make a to -a and -a to a. just swap the wires.

otherwise you have bad motors, or need to make sure that a -a are 1 coil and b -b are the other coil.

Edited 2 time(s). Last edit at 08/05/2013 12:52PM by jamesdanielv.
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radus
Re: DRV8825 does not work
August 05, 2013 04:49PM
jamesdanielv Wrote:
-------------------------------------------------------
> just watched the video. it looks looks like your
> motors are not correctly wired. switch a with -a.
> this should invert one of the coils. make a to -a
> and -a to a. just swap the wires.
>
> otherwise you have bad motors, or need to make
> sure that a -a are 1 coil and b -b are the other
> coil.

Tried to invert the coil ... But nothing helped. Still turns choppy with a screech.

All four drivers DRV8825 work that way. =(
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jamesdanielv
Re: DRV8825 does not work
August 05, 2013 05:06PM
do you have any other motor or driver to try?

otherwise you can read more here of issues with that driver chip

[forums.reprap.org]

Edited 1 time(s). Last edit at 08/06/2013 12:51AM by jamesdanielv.
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radus
Re: DRV8825 does not work
August 06, 2013 03:36AM
jamesdanielv Wrote:
-------------------------------------------------------
> do you have any other motor or driver to try?
>
> otherwise you can read more here of issues with
> that driver chip
>
> [forums.reprap.org]

4988 works fine with these motors.
4988 driver works fine
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radus
Re: DRV8825 does not work
August 23, 2013 01:13PM
Problem solved with set firmware to Marlin. Previous was sprinter. And maybe the problem was in the parameter MAX_STEP_FREQUENCY.
In Marlin is 40000, but in Sprinter is 30000...
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