MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS. The power panic is triggering when on a UPS this should not happen. I have several printers running on UPS and when power to UPS is interrupted all printers attached work perfect except for the MK3 which triggers power panic. I dont know if this issue is the latest firmware or hardware a hardware issue but it is way too sensitive.
The Latest Firmware can be found here https://github.com/prusa3d/Prusa-Firmware/releases
Open Firmware Issues https://github.com/prusa3d/Prusa-Firmware/issues
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
You should create an issue on github so the developers see it.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
I'm using the previous firmware (3.2.1 I guess) and got the same issue, I was wondering if it was beacause of the UPS but it seems not
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
I'm running firmware 3.2.1 and UPS (1000VA), never had a power panic trigger on my printer.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
The previous firmware had this problem too when switching to battery on the UPS. This would often cause a layer shift for me but I don't know if that is still the case with the new firmware.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
I see the same on my 9 x MK3. It usually trips a thermal runaway and waits for reset.
I’m running pi zero W on all. I have 18 printers on 2 circuits, and any switch to batteries almost always kills the prusas, whilst my form 2s and CR-10s run without issue until I reset the breaker.
My UPS are all 1500KVA cyber power running in parallel, with 10 UPS total.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
There is 2 type of UPS ;
One when a power cut occurs a little time exist to commute to battery by relay ; perhaps may be problem.
The other battery is continus link in the out plug and a continus flow exist. This model is more expensive.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
I'm running firmware 3.2.1 and UPS (1000VA), never had a power panic trigger on my printer.
Did you ever notice a power failure that could have activate your UPS ?
I bought my UPS specially for printing, my other custom printer which is stupid never stopped because of power failure
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
There is 2 type of UPS ;
One when a power cut occurs a little time exist to commute to battery by relay ; perhaps may be problem.
The other battery is continus link in the out plug and a continus flow exist. This model is more expensive.
Maybe just disable power panic if you're running from the cheaper kind of UPS? Wouldn't that work?
I don't know about the Prusa power supply, but I know that computer ATX power supplies are required, in order to meet the standard, to carry the computer for the up to 10ms of expected voltage drop that may occur with the cheaper UPS's when they're cutting over to battery power.
If not sure, you could insert a suitable supercap across the 24v output of the power supply to serve that purpose.
All in all, though, it sounds like the power panic may be panicking a bit too quickly!
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
"Off-line" : an old type of back-up ups, the commutation is slow (like with relay almost mecanical) ;
"Line-interactive" : the mine APC Back-ups PRO1500 for the PC, imp3D too, the commutation time is less than 2ms, for me i don't test power cut.
The third is "on-line" and so the flow is always continue but batterys is under high charge ; price is up too.
With the mine with short cut => no problem.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
I recall when researching a UPS purchase, some types provide what could be characterized as 'dirty power', and better models provide 'true sine wave' power. If I recall correctly, the MK3 PSU has power factor correction technology. Perhaps these two things are related somehow.
Re: MK3 Firmware 3.3.0 - Power Panic triggers when on a UPS
My experience is that low cost line interactive UPS' produce a fairly nasty stepped square wave that is basically the minimum that a switched PSUs will accept. They also tend to allow pretty nasty frequency and voltage jitter as they can only be on battery or not (some can 'trim' up a brownout). A decent quality "double conversion" or online UPS will make a fairly good sine wave, not allow frequency jumps (this does tend to upset switched mode power supplies), brown-outs or spikes but other than the capital cost, there is a ~3% heat/power overhead to consider.
