Power Failure Heatbed (17319)
Hello,
after successfully assembling my XL 5 Toolhead with original enclosure, the machine works fine and a first 5-color print was printed without problems. This is what I thought. But at the initial run and calibration, the printer rebooted and reported a power failure of the modular heatbed (error 17319). I updated the firmware (6.1.2) and ignored it for now.
But running the heatbed self test later again, the printer software crashes immediately and reports this error. It is nearly the same as this single tool topic:
I had a chat with Prusa support for some hours. Voltages of the PSUs are OK, the heatbed board has the correct voltage, the cables are checked, re-seated and seem ok.
When the heatbed draws a high current, its board reports a power panic (the LED is lighting). Printing small models with a few heated tiles, like my first test in PLA, does not provoke the power panic. Heating the whole bed in small celsius steps also works. Then, there are no errors regarding faulty tiles and even a check with an infrared camera shows, that all tiles are heated evenly.
The Prusa support will send me a new PD part (lower back part, which powers all PSUs), because they guess that at least one PSU gets a bad AC supply. Well, it might be, but what I read from other users, the cause could be in another part. I even unscrewed the heatbed PCB and left it hanging, since this has helped another user. No change.
Has anybody solved this problem already or has a suggestion?
Zwacki
RE: Power Failure Heatbed (17319)
Update: After measuring the voltages (which were stable during power fail), the solution was a defective heatbed sandwich board. I got a new one from Prusa and now it works.
Thanks to the support team!
RE: Power Failure Heatbed (17319)
So what board did they swap? The upper board in back or the heatbed controller board under the heatbed?
I’ve been fighting a raft of similar heatbed issues.
It printed fine for months until I started a huge project with ASA in the enXLosure, and then all hell broke loose. Apparently the 38-41C in the enclosure was just enough to make a hidden isssue surface:
I was getting a whole variety of bed issues, from tile temps reading way hotter than the bed, half the bed just not heating, thermal runaway errors from tiles that weren’t even heating, current issues, just a mess of crazy stuff. Worked with tech support back and forth for almost 2 months before I got one more error I hadnt’ seen before and that one asked to look at the cable between the heatbed and the sandwhich board. Upon examining that, It turned out to be Prusa had mashed the heatbed controller cable under the metal trim that covers it during factory assembly which nearly severed two of the 5 conductors (one had literally one strand of the 26AWG conductor unbroken) and squashed a 3rd one as well.
I spliced that temporarily which made most of the issues go away, but I’m still getting this really weird deal that after a print if I take the print sheet off (like to swap it out for a different one on the next print) I get a current mismatch error simply by removing the sheet.
Prusa sent a replacement cable (which I swapped last night, it was a near total tear down of the machine to do as you have to remove the heatbed, all 3 power supplies, pull all the extruder cabling, dismantle the vertical channels in the printer the two sets of power lines that go through the chain to the heatbed, dismantle the cable chain, pull all the metal trim stuff off around the back and then redo all that to put it back together.
I have’t printed with it yet to see if I still get the error on sheet removal post print.
I’m hoping all the intermittents from the trashed cable didn’t jack up the board.
RE: Power Failure Heatbed (17319)
I replaced the heatbed controller board. It never worked from the first minute.
Curiously, Prusa did not want the faulty board back for analysis. So I guess that they know this type of error. But why do I have to chat hours and hours to get a new one?
Regarding your problem, @lewnworx, I do not understand why the software does not recognize broken or unreliable cables. As I understand, the heatbed controller has its own microcontroller and talks over a digital protocol with the printer's main processor. Error detection in digital communication is established for decades. Either the processors can communicate without problems, or I expect the printer to tell me, that there is a physical communication problem...
RE: Power Failure Heatbed (17319)
@zwacki
yeah, You’d think…
heh.