Duet 3 Expansion Board 3HC Motors Not Working Properly

[Jered]

So, I have been fighting this for a while and just realized, the board is seems to be bad. I made a short vid for you with more explanation. I am hoping that I can get this board warrantied.

For now, I am going to unplug one of the motors from the Duet 3 Main Board 6HC and plug in my direct drive motor, just get by. I will limit me but at least I will be able to print.

Direct Drive config bak.g

Video

[Phaedrux]

So the motors will drive when the current is increased? What are the specs of the motors?

Can you send M122 and M122 B# where # is the canbus address of the expansion boards and copy and paste the results here?

Also please send M98 P"config.g" and post the response.

Can you tell me what board address the 3HC is using in your config?

You should add a G4 S5 command to the start of your config.g which will add a short delay at startup to allow the expansion boards to boot up and sync before the config is executed. Without this sometimes settings won't get applied to expansion boards correctly.

[Jered]

@phaedrux I will try this after it is done printing. I wired my direct drive motor the the other board to get this print going.

[dc42]

@jered one common reason for this symptom is that the firmware versions on the main board and on the 3HC are out of step. The M122 reports requested by @Phaedrux will reveal the firmware version numbers.

[Jered]

Here are the M122 and M122 B1 Results. The M98 P"config.g" results in a green highlighted bar, but no info. Maybe Its not working.

M122.txt

M122 B1.txt

[Phaedrux]

@jered said in Duet 3 Expansion Board 3HC Motors Not Working Properly:

The M98 P"config.g" results in a green highlighted bar, but no info. Maybe Its not working.

That's normal when running in SBC mode and there are no syntax errors.

Did you try adding the delay?

[Jered]

@phaedrux I have not tried adding a delay as this happens when I do manual moves by either sending a command or using the buttons on the screen to extrude.

[Phaedrux]

@jered The delay goes in config.g to give the boards enough time to startup and sync before the configuration is executed. It has nothing to do with when and how movement commands are sent.

Also, now that 3.4.2 is out can you update using:

sudo apt update
sudo apt dist-upgrade

[Jered]

@phaedrux I added the delay to the config and I am quite shocked to see that is seems to be working.

Before, if I ran the motor at slower speeds, it would work just fine. However, if I ran it at say 6000 (max speed) it would not spin, just sit and vibrate trying to spin. So that's why it seems so strange that, at least for now, it seems to be working with just adding a delay.

About the update, where do I type that command into? The command bar?

[Phaedrux]

@jered said in Duet 3 Expansion Board 3HC Motors Not Working Properly:

So that's why it seems so strange that, at least for now, it seems to be working with just adding a delay.

The delay allows the configuration to be applied to the expansions. So before they would have been using default values if they didn't startup in time. So when you sent commands after the fact to change motor currents, they started working again, because they got some actual values.

@jered said in Duet 3 Expansion Board 3HC Motors Not Working Properly:

About the update, where do I type that command into? The command bar?

Those update commands need to be sent to the Pi command terminal, either over SSH or through the Pi desktop if you use that.

[Jered]

@phaedrux Can I update using a terminal window on the Pi? I have a keyboard, monitor and mouse.

If so, do I enter those commands one at a time or can I cut and paste them both and hit enter?

[Jered]

I just answered my own question, and yes is the answer.

Thanks for your help!
Hopefully no more issues!

[Phaedrux]

After the update you should use M122 and M122 B# again to check that the firmware was successfully applied to all the boards.

[Jered]

@phaedrux I did do that and it all looks good!

[Phaedrux]

Glad it was an easy fix.

[Jered]

Hey guys, so I had this problem happen again. The motor was not turning after I changed the config (accel setting) and rebooted.

So I changed the time on the G4 command to 8 instead of 5. So:
G4 S8

It seems to be working now. But I am now not convinced that this is a permanent fix.

Any thoughts?

Attached is my config. config.g

[Jered]

So, this problem just occurred again. It happens when I make a change to the config. After saving the config, it asks if I want to read the config again or restart the controller. Well, if I tell it to just read the config again, the motors connected to the expansion board will not work at a feed rate of 5000 mm/m or higher.

So, to get the motors to work again I told the controller to restart after the config edit and the motors did work. It appears that just reading the config is not good enough. I am wondering, due to the amount of boards I have connect to the main board may be a problem.

Let me know what you think. My config is attached in the previous reply.

Also, I am adjusting the M201 and M566 setting to try and get better quality, however, these setting seem to have no effect on the machine.

I made huge adjustment to them just to see what happens and I don't see anything. I will probably end up starting a new discussion for this.

[Jered]

I have moved this to a new topic.

[Norder]

Link to new thread...
https://forum.duet3d.com/topic/30135/duet-3-expansion-board-3hc-motors-not-working-properly-again