Does M906 set RMS or peak current?

wilriker

@garis My motors are also not optimal with 4.4 Ohm and 10mH and with my extruder motor I was not able to find a better setting than the default. That said there is no guarantee that you can find a setting that will be silent.

I do have silicone dampers on my Z steppers (which I will replace with these standard Nema 17 dampers if I not keep forgetting to order them) and also change my nut to one made from POM/Delrin which also reduced the noise or at least shifted it to a nicer frequency. You could try that.

Martin1454

So, I have been playing around a bit with it - But when I change TOFF from 72 to 69, the sound is a little bit better, but my stall detection/ sensorless homing stops working - @dc42 do you know why this happening?

dc42

@martin1454 said in Does M906 set RMS or peak current?:

So, I have been playing around a bit with it - But when I change TOFF from 72 to 69, the sound is a little bit better, but my stall detection/ sensorless homing stops working - @dc42 do you know why this happening?

I don't. Trinamic has not made the full details of load sensing public, all we know is that it measures motor back emf. I think the back emf can only be measured during the off-time; so maybe it needs a minimum off-time to work.

Have you checked whether you can get stall detection working again by changing the M915 setting?

wilriker

@martin1454 I can only say so much that stallGuard is very sensitive to any kind of changes. This means if you change TOFF you probably have to retune stallGuard. It might continue to work without adaption but there is no guarantee it will.

dc42

Please note, the TMC2660 datasheet says that the lowest TOFF setting available must not be used with the lowest TBL setting.

I have just implemented a TOFF parameter in M569. I expect to release beta firmware later today or tomorrow.

wilriker

@dc42 said in Does M906 set RMS or peak current?:

Please note, the TMC2660 datasheet says that the lowest TOFF setting available must not be used with the lowest TBL setting.

All of the values posted above have a TBL setting of 36 which is RRF default and the second highest value for this parameter at the same time.

I will add this restriction to the generator tool though.
EDIT: Done and added a new release.

I have just implemented a TOFF parameter in M569. I expect to release beta firmware later today or tomorrow.

Looking forward to this!