Power Failure Resume not working - STM32 boards RRF

selva_tvi

I hope Marlin is doing without any external circuit also.

Any chance of going by the same way?

jay_s_uk

@selva_tvi there are no plans to add anything like that. We basically track the duet version of RRF and as all duet boards have power monitoring, it won't get added

gloomyandy

@jay_s_uk Marlin does it by constantly writing the current resume state to the SD card. No idea how well it works (the save state will pretty much always be behind that actual print state and the constant saving will probably reduce the life of the SD card). As Jay has mentioned, RRF monitors the state of the 12/24V supply and saves the state when it detects a drop in the voltage. But you need a board that has a built in voltage monitor (like the Duet3D boards and some of the Fly boards). You could create a voltage monitor circuit to track the 24V supply state (this needs a couple of resistors hooked up to a free ADC capable pin, take a look at one of the Duet3D board schematics to see what is needed), or you could use one of the external solutions like the board jay mentioned.

selva_tvi

@gloomyandy Thank you. Understood.

selva_tvi

@jay_s_uk Hello, as per your suggestions, I am trying to use MKS UPS 24V.

Connected between the power supply and the MKS module.

As per this post, I made as T1 in M581
https://forum.duet3d.com/topic/28967/power-loss-with-ups/2

In config.g, added the below lines:
M950 J3 C"e3stop" ; input 1 e3 filament sensor
M581 P3 T1 S0 R1 ; PLR sensor P1 triggers Trigger3.g always (R0) TRIGGER OFF

Connected the 3pin from MKS UPS module to BTT Octopus pro e3stop.

trigger1.g:

M140 S0 R0 ; set bed temperature to 0C
M140 S-1 ; set bed temperature to 0K to turn it off
M104 S0 T0 ; set extruder temperature to 0C
M107 ; turn off fan
M913 X0 Y0 Z0.3 ;turn motors off
M25 ; Pause the print
G91 ;Set to Relative Positioning
M83 ;Set extruder to relative mode
G1 Z5 E-5 F1000 ;raise Extruder 5mm

When the power is switched off, it didn't show any change. It continued the print, till MKS UPS drains.

Pls guide me on this. Thanks

jay_s_uk

@selva_tvi that looks in terms of your setup, although you may need to add a pulled using ^ to the pin name.
Can you confirm you have it wired like this?

selva_tvi

@jay_s_uk Absolutely the same. Our setup is connected to BTT Octopus Pro board e3stop.

'although you may need to add a pulled using ^ to the pin name.'

Is it in M950? can you pls point it?
M950 J3 C"e3stop" ; input 1 e3 filament sensor

jay_s_uk

@selva_tvi yes, in M950.

selva_tvi

@jay_s_uk M950 J3 C"^e3stop" ; input 1 e3 filament sensor ?

jay_s_uk

@selva_tvi yes

selva_tvi

@jay_s_uk I tried the above 'M950 J3 C"^e3stop"'

And switched off the power. The machine just paused. And it didn't show any movement.

I changed the trigger1.g :

G91;
G1 Z5 E-5 F1000 ;raise Extruder 5mm
;M140 S0 R0 ; set bed temperature to 0C
;M140 S-1 ; set bed temperature to 0K to turn it off
;M104 S0 T0 ; set extruder temperature to 0C
;M107 ; turn off fan
M913 X0 Y0 Z0.3 ;turn motors off
M25 ; Pause the print
G91 ;Set to Relative Positioning
M83 ;Set extruder to relative mode
;G1 Z5 E-5 F1000 ;raise Extruder 5mm

I thought least Z will move by 5mm. But no movements.

For M25, will it call the pause.g? I hope it didn't call pause.g also.

Once the power in UPS is drained, it will be switched off?

How to resume back? by using M916?

jay_s_uk

@selva_tvi T1 just pauses so if you want to do more than that you'll have to use a different trigger and create a trigger file accordingly.
See here about setting up power resume https://docs.duet3d.com/en/User_manual/Tuning/Resume