Duet 3 Mainboard 6HC Motors not Working

tryingtomakestuff

@gixxerfast
The other control board that a tried was a rambo 1.3 off an old Makergear M2. This does have different phase wiring than the Duet boards, but I changed it to match.

I am using E3d Super Whopper motors (motech motor MT-1705HS200AE) and I also tried E3d High Torque Motors (motech motor MT-1704HSM168RE).

Thanks

Gixxerfast

@tryingtomakestuff I'm asking partly because you are running them at 2A peak which is the max that the motors are rated for. The other motors are rated to max 1.6A

This is what's said in the docs M906 about motor currents: "As a rule of thumb, the recommendation is to set M906 to use 60-85% of the rated maximum current for the motor."

Maybe you should lower that a bit and see what happens ?

Otherwise I cannot think otherwise than that your motors are wired incorrectly.

Cheers

tryingtomakestuff

@gixxerfast I tried a couple of different currents, I had it set at 2A because I thought it might work at a higher current. Unfortunately, I could not get it to work at any setting.

Thank you for your help!

Gixxerfast

@tryingtomakestuff said in Duet 3 Mainboard 6HC Motors not Working:

This does have different phase wiring than the Duet boards

I apologize for these questions but I have to ask. As far as I can see, the Rambo 1.3 has the same motor wiring as the Duet board.

How did you rewire it? The motors have crossed middle leads in the docs I have found so far.

tryingtomakestuff

@gixxerfast No problem, I was unclear. For the duet boards, I had used the crimps to make cables and, for the Rambo board, I used the supplied cables from the E3D motor. I believe the E3D wires do have crossed leads and the rewiring I did was uncrossing them to test on the Rambo board. I tested the wires I crimped together by connecting it to the 3HC expansion board and verified that the wires worked with the motors.

Gixxerfast

@tryingtomakestuff OK, because they should be crossed:

Anyhow, I'll leave it there

tryingtomakestuff

@gixxerfast You are correct the wires are crossed, I just had the motor pinout confused in my head.

Any other ideas?

jumpedwithbothfeet

@tryingtomakestuff you say all drivers report a short to ground?! how have you mounted the board? can you post pictures of your your board and how its wired? have you tried disconnecting everything off the board and giving it a try?

#edit incidentally I also run super whoppers on my printer @1600 and they work nicely

dc42

@tryingtomakestuff when and where did you purchase the 6HC? We had an issue with some components back in 2020 that could possibly account for this, but as soon as we became aware of it we recalled all the boards affected. To check whether your board might be one of those affected, use a magnifying glass to read the manufacturing code on the tiny 6-pin packages between the stepper driver chips and the output connectors. There are 4 of them per driver, and they will almost certainly all have the same manufacturing code (so no need to read them all).

tryingtomakestuff

@gixxerfast
Yes, all drivers report a short to ground when activated. The board is mounted on a piece of acrylic with nylon standoffs and screws, shown in the picture below. Since the message only happens after the motor drivers are activated I was not sure if trying to activate the drivers was a good idea with nothing connected.

Duet 6HC.jpg

@dc42 I ordered the 6HC from Printed Solid on 7/17/2020, so it sat in the box for a while until I finished fabricating the rest of the printer. I am having difficulty reading the 6-pin package, but it looks like it reads kaxs4. Also, the serial number is WD41586, I was reading about the recall and that was in the range for the recall.

dc42

@tryingtomakestuff I confirm that your board serial number is in the range of the recall and the KAXS4 manufacturing code confirms this. We will replace it. Please send an email to warranty@duet3d.com and include a link to this thread. I'm sorry for the inconvenience this causes you.

tryingtomakestuff

@dc42 I sent the email for the replacement. Thank you for all of your help! It's not too often a company has this good of service for their products!