E3D Roto + Duet Roto Toolboard - Stepper motor stalling

arturolaz

I haven't been able to conrrectly configure stall detection for the extruder, I just found this post from some years ago https://forum.duet3d.com/post/102570 so I'm running out of options if CoolStep can't be implemented...

dc42

@arturolaz I doubt that CoolStep is the solution because I am not convinced that the driver is overheating. How quickly after the driver stopped extruding did you take the M121? If the driver really is shutting down because of overheating then it will cool down fairly quickly.

BTW your M121 report says that the driver on the tool board is stalled:

Driver 0: pos 0, 2682.0 steps/mm, stalled, SG min 0, temp 69.9C, read errors 0, write errors 0, ifcnt 52, reads 40354, writes 0, timeouts 0, DMA errors 0, steps req 0 done 251658

If you haven't set the stall detection threshold using M915 then that doesn't necessarily mean that it has stopped moving, but it does suggest that it was under high load when last commanded to move.

arturolaz

@dc42 I sent the command as soon as I realized it was failing, 2minutes difference top, at that point I hadn't enabled anything related to stall detection.

Quick update of my tests:

Disconnected the Roto motor from the Roto toolboard and rewired it to use a Duet3 stepper driver - Still failing
Printed the exact same test print but now with PLA hoping that the ABS ambient temperature was the trigger of the motor failure but it also failed
Inspected the whole motor assembly but found no issues apart from maybe insufficient grease on the gears (waiting for the grease to test)

At this point I'm almost sure the motor or some configuration is the problem but I can't find the root cause of it

dc42

@arturolaz what mode are you running the driver in? Send M569 P121.0 to check.

arturolaz

@dc42 these are the current settings:


M569 P121.0
Driver 121.0 runs forwards, active low enable, mode spreadCycle, ccr 0x00053, toff 3, tblank 0, hstart/hend/hdec 5/0/0, pos 8

dc42

@arturolaz said in E3D Roto + Duet Roto Toolboard - Stepper motor stalling:

How can the CPU temperature can be calibrated?

Turn the printer off and give it time to reach ambient temperature. Read the ambient temperature from a thermometer. Turn the printer on and immediately use M122 to get a report from the board of interest. That report includes the CPU temperature. Compare it with ambient and calculate the correction required.

Currently, only the main board CPU temperature calibration can be stored, using the M912 command.

arturolaz

@dc42 the Duet3 control board is not installed inside the closed chamber as the roto toolboard is. How can this calibration affect the outcome of the printing tests?

Is there anything off in the M69 P121.0 report?

arturolaz

For anyone following.

I just measured the coils resistance in "hope" for them to be out of spec but they are not. Both measured 7.6 ohms at room temperature.

I haven't been able to print ABS nor PLA. I will keep trying tweaking the configuration but I feel that I have tried everything.

elmoret

@jay_s_uk said in E3D Roto + Duet Roto Toolboard - Stepper motor stalling:

@arturolaz there is this as well about the Roto itself

That's a PLA limit, to avoid jams in the hotend.

Notepad

@elmoret Can confirm, E3D testing is always a "worst case" recommendation. The max motor amperage is only if they are pushing ultra high flow high pressure, in a 50+C heated chamber, for extreme lengths of time.
You may want to raise your amperage as that would give you more force available.