Driver 4 continues to report high temperature at random times

Dakota

Re: [Temp1 thermistor port fried](Driver 4 reported high temperature)

So this is kind of piggy backing off my old post. I did as @dc42 recommended and grounded the hotend. Which I believe has helped in preventing static shock to the thermistor. Which I can confirm was most likely static shock as I could hear the static charge building up in the ptfe tube of my clients printer. As a side note I’m figuring out how to shorten the filament path to hopefully reduce static build up and friction on the filament.

The main thing I am wanting to sort out is that driver 4 started reporting over heating again which I’ve never seen or know how to deal with, and I really don’t know how to solve it since I don’t know what causes it. Any help on understanding the issue would be greatly appreciated.

dc42

@dakota which Duet do you have, what axis or extruder are you using driver 4 for, and what current have you set on it?

Dakota

@dc42

The duet 3 mini 5 is the controller board. Driver 4 is the x motor (in a core xy set up) and the motor current is 2100mA. I believe the current is within the capabilities of the driver but it’s been a second since I’ve referenced the documentation on that. And I do remember that the motors used were capable of that current. I want to say the max rated current for the motors was 2500mA but I can’t remember.

jay_s_uk

@dakota the max current for the 2209s is 2000ma peak. If you're running them that high, I would suggest active cooling for the board if you're not already.
A continuous fan blowing across the underside of the board should be sufficient.

dc42

@dakota unfortunately the headline figures quoted by Trinamic for max current only apply under ideal conditions with a much larger PCB area for cooling than is practical. However, running the motors at 2A peak may be possible if you provide good cooling of the Duet. See https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board.

Dakota

@dc42

Ah I see… well in that case I’ll lower the current on them. I hadn’t installed active cooling over them but their typical working environment outside of the enclosure on the back panel is 15 - 20 degrees Celsius. Either way thanks for the clarification and I’ll lower the working current.