Uninterruptible power supply system does not work

Del87

Hello! Need some help or advice.
Before firmware upgrades it works like this: printer working, everythink is ok, I turn off the power on the voltage stabilizer - the voltage slowly decreases, I turn on the power on voltage stabilizer - it becomes 24 volts again (information in dwc). Now after some firmware upgrades: I turn off the power on the voltage regulator - the voltage slowly decreases, turning back - the voltage still decreases, it becomes 24 volts only when I press the power button (associated with auto-off module) on printer. The problems, in my opinion, began after it became possible to change PS_ON pin by the M80 or M81 C command, but downgrading to version 3.3 did not help. Tried consistently down from version 3.4.0 beta 6 - everywhere the same thing. Duet 3 mini 5+ board, capacitor assembly and auto-off module connected (need to hold down the power button for a second to turn on the printer).

Phaedrux

@del87 said in Uninterruptible power supply system does not work:

but downgrading to version 3.3 did not help.

I think you've ruled out the firmware update causing the problem if it still happens on the previous firmware version.

Can you provide some more details on what your voltage stabilizer is and what the auto-off module is?

Del87

@phaedrux direct connection behave same way, so it is not stabilizer problem.
Mb button or relay issue. There is photo of my connection. Two trees auto-off module for Lerdge (https://www.aliexpress.com/snapshot/0.html?spm=a2g39.orderdetails.order_info.4.70dd4aa6H01pfu&orderId=5002151071554668&productId=32974992635&_ga=2.51792621.558492919.1637949936-533605360.1577117828). 220V from main power goes to module. Capacitors assembly connected to Omron Power supply. electric duet 3 mini.jpg

alankilian

@del87 That link goes to your order page so I can't see what the product is.

Can you link to the product page?

Del87

@alankilian https://aliexpress.ru/item/1005002624712285.html module very similar to this one
or https://aliexpress.ru/item/1005001966349289.html
I bought it long time ago, so theres no links to actual module.

alankilian

@del87 OK, I can see the module and wiring diagram now.

I'm not sure how it is supposed to work from those pages.

There seem to be two functions:

When the AC power is removed, tell the printer to move the head up in Z.
Allow the printer to turn off the AC power when a print is finished.

Then you press the RESET switch to turn the AC power back on again?
https://youtu.be/Kk0tKxKDrIg?t=134

Which part are you having problems with?

AC power fail/Z-move
Printer turns AC power off at end of print.

Del87

@alankilian features above works fine. I want it to work like this: turn off the printer power for a couple of seconds, insert it back, printing goes without interruption, the voltage returns to 24V. Without pressing the button of the module by the operator.

alankilian

@del87 Oh, if you want that, you should get a regular AC UPS system and hook that up.

I'm not going to do the math unless you insist, but I think you're going to need a LOT of capacitors on the 24 Volt DC line to run a printer for several seconds without getting an undervoltage stop.

This "UPS" seems to have enough juice to immediately stop the heater(s) and move the Z up a little and then shut down the printer. Not enough to be able to continue printing during that time.

I guess if you want it to auto-start (I don't think that's a good idea) you could try holding in the reset button and see what happens.