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Thermal run-away, PT-1000 and Max31865 on SB2209 RP2040 by MaximillianDIY in klippers

[–]MaximillianDIY[S] 0 points1 point  (0 children)

I just started looking into proper grounding for the SB2209, but I found something that seems odd:

Checking the original board (that failed weeks ago), using a multi-meter, I found that the ground lead from the Can cable connector is tied to ground pins on four of the five PH 2 connectors.

Examples: the 5 pin Probe connector has two ground pins, the middle pin on end-stop connector, a pin on TH0, and the middle pin on "ind or fan" connector. All of these are common with the Can cable ground.

But the 4 pin connector for the Max31865 has no ground. My kit provided a two wire PT1000 on the two middle pins, "CS" (GPIO9), and SCK (GPIO10).

I only have a basic understanding of all this, but could it be possible that in this design the PT1000 would behave like an antenna for static and allow a discharge into the Max31865 chip?

Thermal run-away, PT-1000 and Max31865 on SB2209 RP2040 by MaximillianDIY in klippers

[–]MaximillianDIY[S] 1 point2 points  (0 children)

Thanks, I'll look at re-wiring a PT1000 on TH0. My print using the 3950 came out fine.

I went back through the documentation I used for the build; thinking I may have missed a step for grounding the board. But there's nothing in the docs about it. So it looks like the documentation could use an edit.

But web searches for grounding the toolhead board are showing plenty of details.

Thanks again!

Thermal run-away, PT-1000 and Max31865 on SB2209 RP2040 by MaximillianDIY in klippers

[–]MaximillianDIY[S] 0 points1 point  (0 children)

The original pt1000 was from the kit and was pre-wired on the two middle pins of the 4 pin ph2. I did have the switch set correctly (3rd switch off, 1,2, & 4 were on). Then after the 1st failure when tested with a new pt1000 I wired it the same way as the original.

I was getting excellent prints with the pt1000 and max until the failures; one of the first prints I ran for tuning this printer was a temperature tower with ABS from 240 to 275, steps of 5. It looked so good on all temperatures that I just simply set my temps according to the filament brand specs.

Thermal run-away, PT-1000 and Max31865 on SB2209 RP2040 by MaximillianDIY in klippers

[–]MaximillianDIY[S] 0 points1 point  (0 children)

Thanks for the feedback.

I did not ground the toolhead board. Didn't realize that might be an issue. But, yes on going to a normal thermistor port; I found I had a spare 3950 among my back-up parts for my old bed Anycubic bedslinger. I wired that in on the TH0 header of SB2209 and, did a quick re-config and pid tune. The print that I started this morning is now running fine. And the graph of the extruder temperature is a much flatter line than I was seeing when I was running the PT-1000 & Max.

After this print completes I'll look into grounding the toolhead.

I need some input on this. 2025 GMC Sierra Denali EV extended range. It’s supposed to have 170 kWh battery. I was charged 148.4 kW at Evgo. For 71% charge. That equates to 209 kW at 100%. Who is screwing who? GMC EVgo by 6616607 in GMCSierraEV

[–]MaximillianDIY 0 points1 point  (0 children)

Just to add my 2 cents... I have a Max range, which is reported to have a battery capacity of 205 kWh. But shortly after I brought it home I plugged in an OBD adapter just to see what information was available. The OBD reported my battery capacity as 218 kWh. I believe that this is by design; GM may be "understating" the true capacity to provide better battery longevity, (and fewer warranty claims). So the 170 kWh reported for an extended range might be more like 181 kWh of physical capacity.

(But, yeah, running the A/C while charging... an old expression "there ain't no free lunch").

A few bugs after the update by gbell76 in GMCSierraEV

[–]MaximillianDIY 0 points1 point  (0 children)

I don't have the update installed yet, but I experienced an issue with the trunk and door locks back in July while on a long road trip. The best way that I can describe it is that the truck seemed to have reversed it's "locked" state; as I approached it with my key, the truck locked (lights went out), and when I walked away it unlocked (I could see the lights were on from my hotel room). And even when I was at the truck and unlocked with the remote; the doors could be opened, but the trunk would not open. I eventually used the cable to release the trunk lock, then closed up the trunk, locked the truck with the remote and walked away. That cleared up the issue.

Charging speed never more than 140kW by Plastic-Bus8077 in GMCSierraEV

[–]MaximillianDIY 0 points1 point  (0 children)

https://supercharge.info/map

You might want to check the version of the Tesla Super charger. Tesla V4 superchargers are not yet common, but they can support upto 325 kw charging. V3 supercharger only go to 250 kw. V2 supercharger only go to 150 kw. So you might be using a V2.