How to tune Stall Detection?
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Are you definitely running 1.20 or 1.21RC series firmware, on a Duet WiFi or Duet Ethernet?
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Sure!
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What are your Z steps/mm?
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It's 400 steps/mm
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From comparing other motors, I estimate the inductance of that motor to be about 8 to 10mH. What maximum Z speed at full torque does that give?
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I am not 100% sure, if all the other values I have are correct.
I took them from this site: http://www.mytechnologie.de/2017/05/22/projekt-3d-drucker-die-motoren/I suppose by "maximum Z speed at full torque" you mean "Speed at which torque starts to drop (mm/sec), high slip angle".
For 8mH this gives me 32,7mm/s and for 10mH it is 27,9mm/s.
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No additional suggestions?
This feature was one of the main reasons for buying the Duet
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Is it just the Z motor that you can't get stall detection working on? Does it work on the X and Y motors? How about U?
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It works on X and Y. I tuned the values until I got no more false detections. S22 seems to be the value to go on these axes.
I tried [c]M915 Z S-50 F0 R1[/c] and [c]M915 P2:4 S-50 F0 R1[/c] for Z but never got stall detections on drives other than 0 and 1 (X and Y).
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I have added this to my list of pending investigations. I should get to it before the end of this coming week.
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Great, thank you!
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Any news on this already?
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Do you have one Z motor or two? If you have two, how are they connected?
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See this post: https://www.duet3d.com/forum/thread.php?pid=37997#p37997
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If you run M915 without parameters, what stall detect configurations does it report for drivers 2 and 4?
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The console does not show the whole response. Seems to be too long:
Driver 0: stall threshold 23, filter off, steps/sec 200, coolstep 0, action: log
Driver 1: stall threshold 23, filter off, steps/sec 200, coolstep 0, action: log
Driver 2: stall threshold -10, filter off, steps/sec 200, coolstep 0, action: log
Driver 3: s -
You can send M915 D# where # is the drive number, to report the settings for a single drive.
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Yeah, sure.
Drive 4 is the same as 2.
Tried this before with -50 instead of -10 for drives 2 and 4. -
Please can you set up a config.g file and test script (based on your Z homing file) that I can use to test this. I don't mind whether you have 1 Z motor or 2, just so long as I can put those files on a bench test setup and replicate the fault.