fg
Apr 15, 2019

TMC2100 stepper drivers potentiometer setting

Hi!


Did anybody already do the math for the reference voltage setting of the TMC2100 stepper drivers?


The instructions tell to turn the poti of the drivers to a specific location but since tiny turns already change the settings a lot I would like to eliminate a faulty setup on my side because the Y-axis sometimes isn't able to move the print head...

Makertech
Apr 17, 2019

For the X axis (platform) you can set it between 0.95-1.05v and for the Y-axis (hotend) you can get away with less, between 0.6-0.7v. If your Y-axis is struggling, check you don't have any resistance on the axis when powered off and moving it by hand.

fg
Apr 17, 2019

Thank you! I will try that as soon as I receive the replacement/missing parts. Indeed I get lots if resistance on this axis About every 10 cm it is really stuck in place and I need more force to move it...


Makertech
Apr 24, 2019

@fg
It sounds like it might be an issue with the roller wheels being on too tight, have you tried loosening them a little. Also the tool carriage, where the Y-belt connects to might be rubbing against the extrusion beam, if that's the case you may need to use a pair of pliers to bend it so its straight.

esmith13
May 17, 2019Edited: May 17, 2019

@Makertech
, I am having a similar issue. My Y-Axis moves smoothly with one finger but when I try to perform the Y-Axis movement it moves once then won't move again unless I power off and on. If I give the Y-Axis home command it will move all the way across the gantry and home perfectly fine - but then never move again unless i power off and then back on. Any ideas?

Gavin Rea
May 19, 2019

I have the same issue as esmith13. I've made sure both the belt and the rollers on the y axis are loose and there is no rubbing. When I power on I can move the Y axis a single increment but then it is unresponsive. I've checked the wiring several times. Could it be software related?

Makertech
May 22, 2019

@esmith13
@Gavin Rea
If you haven't already, try adjust your TMC2100's trimpot, it could be sending too much current through the driver causing it to shut down to protect itself. If you have access to a multi-meter you can check the vref as outlined above. Other wise you may need a replacement driver.

esmith13
May 22, 2019

@Makertech
, where can i measure the voltage from an which direction is which for voltage up/down?

esmith13
May 22, 2019Edited: May 22, 2019

@fg
@Makertech
I think I see my problem but I don't know the solution... My Y axis driver is at 1.918V no matter what position the trim pot is in. I could adjust the X driver just fine. What does this mean?

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