I’ll ask again; have you tried making the stepper motor turn (both through the EBB42 and the SKR)?
I’d also like actual pictures of your motor, your EBB42 and the wiring - not catalog images.
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Looks good - thank you.
Now, can you get the extruder stepper to turn? You will need to heat the nozzle to at least 170C, but that looks like it’s possible with your setup with the Stealthburner wired in.
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Do you go with separate 24 V and GND to the EBB42 from your PSU or how is it powered?
How thick are those wires?
You could even declare the EBB42 extruder as X for testing purpose and use SET_KINEMATIC_POSITION for moving it via Mainsail or alike:
https://www.klipper3d.org/G-Codes.html?h=set_ki#set_kinematic_position
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There is no problem in the rotation of the extruder motor. is turning. I can turn it when I increase the temperature above 170 C.
The only problem is that the temperature increase continues even though the stepper motor is stopped.
The cable may seem thin, but there is no heat etc. in the cable.
Thanx for checking that and confirming.
Sorry, can you turn the motor (by hand) when it is stopped and warm? This is strictly for personal curiosity - I would expect that if it is warm, then the coils are energized and it will be locked in place.
Regardless, I think you have to try another EBB42.
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EBB42 has powered from SKR3 CAN-FD port.
There is no heating in the cable.
The stepper and hotend working properly.
I think to change this cable to 22AWG.
You asked before. I am sorry Myke. I forgot to write.
When the stepper motor stops, it cannot be rotated by hand.
But sometimes when the stepper motor stops, there is a strange micro vibration. When this vibration is present, the temperature rises faster. It is as if a current that is too low to turn the motor continues to flow.
After adding sense_resistor: 0.100 to the [tmc2209 extruder] section, these vibrations decreased. (I’m just doing trial and error now)
That vibration that went away with setting the sense resistor is normal, That’s the chopper in the driver working to keep the driver still. It was probably have compensation issues cause you had resistors in the path but they werent defined (that’s an assumption though I’d have to look at the internal circuit of the driver).
Relevant section though:
Specifically:
When the coil current is switched, spikes at the sense resistors occur due to charging and discharging
parasitic capacitances. During this time, typically one or two microseconds, the current cannot be
measured. Blanking is the time when the input to the comparator is masked to block these spikes.
The SpreadCycle chopper mode cycles through four phases: on, slow decay, fast decay, and a second
slow decay.
This isn’t normal as it seems like the TMC2209 is being commanded to be on and hold the position (what @TheFuzzyGiggler indicated).
BUT this shouldn’t be happening if things are just sitting there and you’re not printing (or even started a print).
Could you show the make menuconfig parameters that you are using for the SKR and the EBB42 along with your current printer.cfg and klippy.log?
There’s still something that isn’t right. You could try swapping out the EBB42 but I suspect you’ll have the same problem. Let’s see if we can figure out what’s going on with the software and configuration.
This is true, I made the assumption the stepper was under power and the coils were energized holding it steady.
Per the data sheet:
Since the sense resistors weren’t defined the driver was most likely trying to use it’s internal sense resistors and was expecting a direct connection to ground on the BR pins.
But there were resistors on those pins so I imagine it looked like a “high” (relatively speaking) trace resistance. Could have easily caused the asymmetries it warns about.
But either way, That wasn’t the point of the entire post. I was just curious about it when it was mentioned.
@Dentist
Try powering the EBB42 from the power supply and not through the board.
This would eliminate the chance that the board has a power trace issue with that connector, BTT in the past has made errors in design of PCBs, for example GTR not connecting the diag jumpers to the motor diag pins this made the daig jumpers useless.
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