PID Tuning Caused Bed Heater To Not Work

I'm running thru the initial configuration & setup for my first V-Core 3.1 500mm build. I had zero issues running a few calibration cubes, and went onto doing PID Tuning. I was able to successfully PID tune the extruder, and moved onto doing the bed heater. About 1/2 through the PID process of heating to temperature of 100* (Print mostly ASA), Klipper returned an error of not heating at the expected rate. I restarted firmware, and proceeded to try and heat the bed again but it keeps returning the same error. Klipper shows giving the bed 100% power but the bed doesn't seem to heat up anymore. Bed heater is wired to the SSR correctly, Could I have fried the SSR? Could I have fried the heater? Is there some sort of PID Bug?
27 Replies
R34Pr
R34Pr2y ago
SSR seems to be working fine
blacksmithforlife
Upload a picture of your SSR wiring
R34Pr
R34Pr2y ago
Pretty messy pic before I cut everything to length but I followed the attached diagram.
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blacksmithforlife
what board is that?
R34Pr
R34Pr2y ago
BTT SKR 3 EZ (won it during the RatRig giveaway last year sometime) I replaced the fuses onboard to see if itd make a difference but it didnt. I can find my go-to multimeter but the cheap one I have doesn't get a reading. I'll upload a vid shortly.
blacksmithforlife
I can't tell from the photo, did you hook up the AC and DC sides correctly on the SSR?
R34Pr
R34Pr2y ago
Yes (at least I believe so), I triple checked the wiring diagram and even used it as a checklist to confirm.
blacksmithforlife
did you follow https://os.ratrig.com/docs/boards/btt/skr-3-ez for everything but the SSR?
R34Pr
R34Pr2y ago
correct! I used it as a reference, made sure stepper motors matched, removed any jumpers, etc. EBB42 is used for the extruder and functions at it should. Waiting on a multimeter to get delivered today. I think it toss out some crazy current or something in the middle of the PID tune and fried the bed, possibly.
blacksmithforlife
ok, because I don't see the thermistors attached like in the ratos diagram
R34Pr
R34Pr2y ago
If you open the pic in a browser and zoom in you should be able to see it easier. I ended up sleeving it in red.
R34Pr
R34Pr2y ago
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blacksmithforlife
Yeah, idk then. I would bring out the multimeter and verify everything is getting power correctly
R34Pr
R34Pr2y ago
I shouldve probs not tried to PID as high as 100C maybe, idk. I just find the whole thing odd.
blacksmithforlife
No, that seems reasonable if you will have your bed near 100 most of the time
R34Pr
R34Pr2y ago
Thats exactly why I selected 100 bc I'll mostly do ASA prints. I suppose I can bypass the ssr and attempt to plug the bed to the main board and run it like 30C
R34Pr
R34Pr2y ago
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R34Pr
R34Pr2y ago
I’ve got 120v basically all the up to the bed. I’m thinking the PID Tune fried it. Does klipper logs show temps?
blacksmithforlife
It should - maybe you blew your thermal fuse
R34Pr
R34Pr2y ago
Yeah I was able to confirm it with the multimeter sadly do you know where I can get a new fuse @blacksmithforlife 🇺🇸
blacksmithforlife
someone might know in #self-sourcing I don't know offhand
R34Pr
R34Pr2y ago
thank you for your help!
R34Pr
R34Pr2y ago
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R34Pr
R34Pr2y ago
Thank you very much for the help @ptegler ! Much appreciated! I’ll take a look at those that you linked. I ran to my local Micro Center (I’m a lucky SOB that lives near one) and picked up two NTE8125’s as a temporary solution.
R34Pr
R34Pr2y ago
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R34Pr
R34Pr2y ago
I need to be careful because the holding temp is 106* C . I’m hoping to get ASA to stick at like 85-90 even if I have to use magigoo too.
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