I measured the resistors and they are all 47 Ohm with a maximum tolerance of plus 1%. After re-soldering all gate resistors the output seems to work again. I will do a longer test run to check the reliability. Thanks a lot for the quick help.

That makes sense, I had a bug in the software that sent the wrong ID.

Another question, is there a way to send a message to the web interface via CAN, similar to M117? Or in the other direction via G-code a message to the "Expansion Board" similar to M118.

Thank you.

Hello everyone,

I'm currently trying to communicate with my Duet 3 via the CAN interface. I have a self-developed board that controls several heaters and sensors. To keep it simple I want to make it look like an expansion board for the Duet3. When I try to run M308, i get correct data on my board, but the Duet is not happy with the response. First I get "Warning: Discarded msg src=1 typ=6031 RID=0 exp 0" and then "Error: M308: Response timeout: CAN addr 1, req type 6031, RID=0". Therefore I assume that my reply arrives but something is wrong. I have already searched in the firmware but haven't really found what should be attached as "text", for example. Can someone tell me what exactly the Duet3 expects as a response?

Thank you!

I measured the resistors and they are all 47 Ohm with a maximum tolerance of plus 1%. After re-soldering all gate resistors the output seems to work again. I will do a longer test run to check the reliability. Thanks a lot for the quick help.

Hello and thank you for the quick response,

i must have overlooked this thread druing my search. I have tested the board with 12V and it seems to work.

My board has the serial number WD31722. I can send you the output of the M122 command by e-mail, if needed.

If i'm right i have an version 1.0 Board with no diodes, is there a possibility to fix this problem?

Hello Forum,

I currently have a problem with my Duet3 6HC. When controlling the stepper motor on channel 5 the motor runs bad and one phase seems to be not controlled correctly. The driver repots "short to GND". I have swapped the motor to an other channel and tried a second motor on the bad channel. The motors and the wiring seems to be ok.

I have made several measurements and everything seems to be ok. The PWM is clean at the gate of the FETs and also looks good at the output. The high and low side FETs inside the half bridges seem to be ok, too, since i loaded them with some resitive load against V+ and GND. During the measurement at the shunts i found that there is no current flow in one phase although both shunt resistors are ok. But I don't want to exclude that the contact was not good during the measurement.

Has anybody ever had a similar problem or has any other ideas where the fault could be? Currently I assume that the Trinamic Chip is defective.