Setting up to resume a print after a power failure

Renat

I try this function and cant find file sys/resurrect.g on SD card.

i Seach here:

I make all as wrote here: https://duet3d.com/wiki/Setting_up_to_resume_a_print_after_a_power_failure

in config.g

;Setting up to resume a print after a power failure
; For 20V power
M911 S16.0:17.5:19.5 // auto-pause at 17,5V, then either stop at 16V or auto-resume at 19.5V

powerfail.g
G91
G1 Z2 F2400
M83
G1 E-2 F3600

powerrestore.g
M83
G1 E2.5 F600

resurrect-prologue.g
M116
G28
M83
G1 E2.5 F600

What can I do to make the function work?

Renat

Firmware Name: RepRapFirmware for Duet
Firmware Electronics: Duet 0.85
Firmware Version: 1.19+5 (2017-08-30)
Web Interface Version: 1.19

dc42

If the power voltage drops too quickly when power is removed, then the Duet may not have enough power to create the resurrect.g file. It depends on how large the capacitors are on the output of your power supply.

If your PSU voltage is nominally 20V then you can test the function by sending e.g. M911 S16.0:21.0:22.0 to temporarily increase the voltage thresholds.

Renat

If i set M911 S16.0:21.0:22.0 and my voltage 20, then auto-pause and auto-resume will be off, and only save ressurect file will be active and start when voltage drops to 16V.

Do I understand correctly?

dc42

No, the pause and file save will occur at 21V.

Renat

But my voltage only 20V, it never be 21V.

dc42

That's why increasing the threshold to 21V during a print should cause an immediate pause and creation of resurrect.g.

Renat

I can't understand

I Have the maximum voltage at the power supply 20 volts. Where there will take 21 volts?

dc42

Starting a print and then setting the the threshold temporarily to a voltage higher than your PSU voltage is a way of triggering the power down functionality, to check that it is working.