@azariel I don't know about that specific board, but on other Duet boards, there is an on-board jumper that connect 5V to the board. The jumper is removed when it's powered by a USB port. Is the jumper in place?
If it was never removed, it's possible that the USB 5V backfed into the onboard 5V regulator and damaged it.
@aitor Does it happen often enough that testing different configurations could help, or its it so infrequent you're just curious what's going on?
You can start by carefully checking all the power connections. One of the best and easiest tests is the "wiggle test." With everything powered up and running, wiggle all the connections and see what happens, which should be nothing. Another test (hence the question above), is to unplug everything not necessary to have the machine in its idle condition (power, display, and/or Ethernet), and let it sit and see if it resets.
If nothing is found, maybe consider replacing the power supply.
@adarack Glad that it's fixed. My money is on a poor connection such that as it approaches the temperature setpoint and shuts off the heater, there's a good size voltage spike that resetting the board. If it starts doing it again, I'd suspect the power supply, Meanwell or not.
@leobg Your blue and red wires are reversed at the stepper in comparison with mine.
@nightlonk42 Here's how it's wired at the stepper end. Note that this is as viewed from the front of the extruder, and also that the stepper has been rotated so that its connector is on the bottom.
@nightlonk42 Those colors match how I have mine wired at the toolboard end, but at the stepper end, manufacturers can be a bit arbitrary. Honestly, just try a few permutations, as it'll take much less time doing that than waiting around for answers that may not be appropriate for your stepper.
Also, double check how you configured the stepper - having that wrong could do it as well. Someone's bound to ask for you to list out your config.g...
You can try washing the board in distilled water, then putting it in a warm area to dry. That said, were any changes made to the printer before the failure? It's highly unlikely that Dimafix is causing the problem, but try the above.
@fcwilt Fredrick, I've seen posts by some advanced users where they're directly accessing the Duet firmware. Are there not global flags for X, Y, and Z homing? If so, it seems like these flags could be could be temporarily loaded with "Homed" and the extruder moved as desired. Or are these flags unavailable?
@thekm Understood, but it does argue for position feedback, so that speed can be slowed down smoothly and still end up where you want it.
I just realized the flaw in my suggestion: If it's got enough momentum and bulk, it'll still coast to a stop even when the steppers are trying to stop it after hitting the switch, losing its known position.
This seems to make a case for stepper "servos" with positional feedback, or go for the full Monty and move to true servos.
I wonder if you could play games with the code, like, temporarily setting motor current limits low before homing. It seems like it would slow down both acceleration and deceleration, maybe.
Dumb question: why can't you have and endswitch at, say, 50mm from the hard stop. When it passes that point, you know where it is, and can slow and continue on for N additional counts to get to where you want to end up?
"...I thought I had made the reason for the failure clear enough. Please read my first post properly..."
You're not going to make any points or friends here talking that way. You had the problem, and at this stage, still appear unsure it's really fixed. Good day, sir.
A few more possibilities:
@ooly said in warning leds:
flashing infrequently
Well... what do you mean by "flashing infrequently"? It's a bit of a double meaning depending on interpretation. It's normally flashing at a periodic 1Hz rate.
Yup. If it's reporting "active" when enabled, it means that the switch is already in the "active" state (defined by you as a high or low signal), when the sensor was enabled. It's either what fcwilt said above, or it could be a shorted or open switch, depending how it's wired.
If there's some question of what the switch is doing, unplug it from the controller board and put an ohmmeter/continuity tester on the connector leading to the switch. It'll either be shorted or open. Now activate the switch, and it should go to the opposite state. If it does, there's nothing wrong with the switch or cable, so the question becomes: is the voltage level being fed to the controller board what's expected by how you have it configured?
@phaedrux said in Duet 2 Wifi issue. Wont connect after high voltage warning:
Slowly add back things one at a time to see if you can find what it was.
^This. Best practice is to plug in each connector with power off, turn it on briefly and read the voltage or watch for the error message, quickly shutting it off if there's a problem. It's now been isolated to whatever cable was plugged in last, so unplug the far of that cable, and power up the board again. If the problem reoccurs, it's in the cable, and if not, it's in whatever that cable connects to.
@achrn Haha, yeah. If they proving anything, it's that the cross sectional shape of materials matters for bending strength, and has little or nothing to do with the material itself.
They probably mix their units... like, "This PLA beam of size X is as stiff as a bar of steel of size Y."