Topics created by Esteban

@Esteban said in Information on the distribution of calculations on Duet cards:

On the other hand, one last question: for very complex machines with a large number of axes, would it be more “efficient” to have a main 6XD and then add 1XDs and another 6XD in daughter mode?

If all the axes and extruders use servomotors then you should start with a 6XD. If there are more than 6 servos to connect then you will need another 6XD or some 1XD boards to drive them. If the additional axes need high step rates then another 6XD would give better performance than 1XDs.

To read mcu and driver temperatures on an expansion board connected to a Duet 3 mainboard, put the CAN address at the start of a dummy P parameter. For example, a board at CAN address 1 would use:

M308 S12 Y"mcu-temp" P"1.dummy" A"3HC MCU"
M308 S13 Y"drivertemp" P"1.dummy" A"3HC Steppers"

https://docs.duet3d.com/User_manual/Reference/Gcodes#m308-set-or-report-sensor-parameters
See the tab for MCU and driver temp

@Esteban

if I max out at 6.8 * 24 = +/-160W and 1.7 * 24 = +/-40W, could that explain why there's no voltage drop?

Sure, but I doubt the measured values. Both @achrn and @dc42 have pointed out how to improve accuracy, but in the end, the Duet has to apply PWM to fine-tune the temperature of a heater, which might be the reason why your PSU can handle the load.

As soon as heaters arrive in PWM mode to regulate the current, they draw less power - on average. Cheap PSUs might be unable to deal with the spikes (that’s why ”Chinese Watts“ tend to deliver less ”bang” than you’d expect), but thanks to beefy capacitors and maybe some over-engineering, you are on the lucky side:

everything has always gone smoothly.

According to my static calculation (addition of nominal power requirements of all components), you are a bit over the limits, but as long as the voltage remains stable, there’s no reason to worry.

@Esteban yes that does seem odd. When you run M122 do drivers 5 and 6 show up in the Move section, or are they flagged as not present?

In theory you could forcefully move the motors by hand so fast as to create an over-voltage condition that could blow multiple drivers both on the main board and the 2-driver daughterboard; but I doubt that you would be able to move them that fast.

@Phaedrux @dc42

Okay, so accessibility depends jointly on the G31 and M208 command?

Concerning my M122, I'm afraid I won't be able to run it after a print stop, because my drivers aren't working due to the failure...
But when I run it on unload, this is what I get, along with my configuration :

config.g
console.txt

@Esteban See my response to this thread, which has the same problem: https://forum.duet3d.com/post/344608

Basically, you need to calibrate the probe with M558.1. See https://docs.duet3d.com/en/User_manual/Tuning/scanning_z_probe_calibration#calibration

Ian

@droftarts No, they're not... Which is something I'm going to do very soon.

Thank you for your feedback, I will contact support 😉

@Esteban Glad you fixed it. I updated your first post with translation and corrected links, and was about to look through your config to see what it was doing, so thank you for saving my time!

Ian

Yes, unfortunately it seems like the driver has failed and should be replaced under warranty.

@dc42

Thank you for your great responsiveness 😉