Is My ToolBoard 1LC Dead?

jonoharms

Hi All,

My Config:

Mainboard: 6HC
Toolboards x2: 1LC with tool distribution board
Printer: Jubilee (core xy with toolchanger)
Firmware: 3.3beta2
Extruders: Hemera

My problem:

One of my toolboards is dead I think. When I power it on with nothing else connected and it not attached to the hemera, it gets the two solid red and blue leds, but no flashing red LED. The atmel chip gets very hot and there is a soft buzzing noise. Measured some continuity to check for a short, and get continuity between GND and 5V when not powered on. My guess is I shorted something.

The other toolboard is fine, and this toolboard was working a few days ago with the new firmware. I think I may have damaged something during the rewiring that I was doing.

Troubleshooting performed:
Tried to do a reset using the button, but got no response. Disconnected all heaters, fans temp sensor. Removed from hemera to rule out a short.

Please let me know if there is anything else I can try. Also, not sure if this a warranty issue if it turns out it is dead.

Regards
Jono

o_lampe

@jonoharms said in Is My ToolBoard 1LC Dead?:

this toolboard was working a few days ago with the new firmware. I think I may have damaged something during the rewiring that I was doing.

@jonoharms said in Is My ToolBoard 1LC Dead?:

Also, not sure if this a warranty issue if it turns out it is dead.

---no comment

jonoharms

@o_lampe I'm 99% sure this is my own stupid fault, and therefore not covered under warranty, but holding out hope that it might be something easy to fix. But I doubt it. Just wanted a second opinion.

Pretty sure it was something to do with the motor cable I made (hemera -> toolboard). I had a second look at my other tool, and although I matched the colors, the pins locations don't match, so I think that must have been it.

oliof

@jonoharms photos of the front and back of the toolboard might help to see if there is irrevocable damage or not (in another forum someone had a short on their tool board due to a tiny magnet, which when removed turned out not to have caused permanent damage).

o_lampe

@jonoharms

Maybe there is a glimpse of hope for you: IMHO it's impossible to damage a stepper driver or other electronics behind the driver by mismatching the stepper wires?!

It either wouldn't run or run reverse, but never cause a shortcut.

Phaedrux

Some photos of the board and how it was wired would help to determine if it's damaged.

oliof

@o_lampe actually ... I managed to fry a stepper driver on my Duet2Wifi by driving a miswired stepper, but that also was at 5x max current the stepper was rated at. But you'd usually get a phase mismatch and overtemp warning before the magic smoke goes out.

jonoharms

Thanks all.

Link to photos (click 'view original' to get the full quality photos. https://1drv.ms/u/s!An1MTmHeuUiDjt8adZsG_NLJ8H69BQ?e=R8Azs9

I can't see any obvious damage, no discoloration that I can see.

Definitely wired the motor wrong (don't ask me why, I don't know ). The motor cable I made goes (toolboard side -> motor side):

red (B-) -> green (A-)
black (B+) -> black (A+)
yellow (A-) -> red (B-)
white (A+) -> blue (B+)

I didn't double check the motor wiring before powering on, because I was also sure that if I did it wrong, it shouldn't destroy anything. From this wiring, I assume it might just go backwards. Can't see how this would have shorted anything.

The CAN cable I made is straight through (checked with multimeter). ie yellow = yellow, red = red etc.

As I said, this was working, then I disconnected it, made the new motor wire, CAN and power cables, and connected it back up, to find it not working. So I'm stumped.

Could it have been static damage?

dc42

It most certainly is possible to damage a stepper driver by mis-wiring the phases. Swapping complete phases over causes on problem; neither does swapping the two wires of one phase (these changes just make the stepper motor run the other way). But mixing up the phase wires can cause damage. The reason is that the stepper driver chip controls the current in each phase by PWMing the voltage across it. The two phases are controlled independently, because at most positions they need different currents.

When you swap phases, the current control breaks down completely, because the current in the motor coils doesn't behave in the way that the driver expects. So you are completely reliant on the short-circuit detection that is built into the chips detecting that there is a problem and shutting down the driver before any permanent damage is done. There is a small delay built in to the short circuit detection, otherwise the capacitance of the stepper motor cable and the motor winding would trigger it. Whether the short circuit protection works fast enough to provide protection will depend on factors such as the VIN voltage, and the motor phase resistance and inductance.

jonoharms

@dc42 Thanks for the information. I'm guessing that's what happened then. Good to know for the future, hopefully that will make me more careful.

dc42

@jonoharms, which country are you in? In case we can get your board repaired economically.

jonoharms

@dc42 Australia. My guess is shipping alone would be more expensive than a new board.