Hi,
I'm trying to enable the POWER_LOSS_RECOVERY feature but it's not working well.
After a power failure, pin 31 is activated by the HIGH value and printing is interrupted.

These commands are not executed even if the UPS 24V power supply is still active:
POWER_LOSS_ZRAISE 20 mm
POWER_LOSS_RETRACT_LEN 10 mm

After restarting the printer, the extruder moves to position X0, Y0,
HB and HE are heated, but printing does not start exactly where it left off.
The Z axis will not return to where it was before the restart.

Thanks



UPS 24V connected.
https://github.com/makerbase-mks/MKS-UPS12V-UPS24V?spm=a2g0o.detail.1000023.17.53df5356e6PStx

Marlin FW bugfix 2.0.x

#define POWER_LOSS_RECOVERY
  #if ENABLED(POWER_LOSS_RECOVERY)
    #define BACKUP_POWER_SUPPLY       // Backup power / UPS to move the steppers on power loss
    #define POWER_LOSS_ZRAISE      20 // (mm) Z axis raise on resume (on power loss with UPS)
    #define POWER_LOSS_PIN         31 // Pin to detect power loss 
    #define POWER_LOSS_STATE     HIGH  // State of pin indicating power loss
    #define POWER_LOSS_PULL    pulldown // Set pullup / pulldown as appropriate
    #define POWER_LOSS_PURGE_LEN   20 // (mm) Length of filament to purge on resume
    #define POWER_LOSS_RETRACT_LEN 10 // (mm) Length of filament to retract on fail. Requires backup power.

    // Without a POWER_LOSS_PIN the following option helps reduce wear on the SD card,
    // especially with "vase mode" printing. Set too high and vases cannot be continued.
    #define POWER_LOSS_MIN_Z_CHANGE 0.05 // (mm) Minimum Z change before saving power-loss data
  #endif

Edited 8 time(s). Last edit at 05/23/2020 03:49PM by DrumClock.

I updated bugfix 2.0.x and the problem is solved