[FR] No delta support for PowerLoss resuming

[karabas2011]

1. when resuming delta, printer homes and moves to XY - crash.
   So it needs to go down a bit, before XY moves

2. hard coded Z speed F200 too slow for delta

[Foxies-CSTL]

@boelle @sjasonsmith
I confirm the problem and why put the label "Feature request" since it worked very well before 20201223.
I validated this function on my printer and I built several firmwares for the FLSun QQS community in different combinations of stepper drivers ( A4988, TMC2208 and 2209). No user feedback since.
I also have a Delta QQS with a Hispeed aka Robin_mini clone with 2209Uart and the function has been activated since the end of September with #define POWER_LOSS_PIN -1 for the creation of the PLR ​​file on the SD card.
But since 20201223(Bump Distribution), the recovery is correct but the head crashes on the bed and its positioning movement is very slow.
Important note: if I active "#define DELTA_HOME_TO_SAFE_ZONE" in the configuration.h , the head does not crash but the recovery and the positioning are very slow !!

[sjasonsmith]

@Foxies-CSTL did you have UBL enabled when it worked previously? With UBL enabled in the configuration file I think there is extreme risk of movement problems on delta right now.

[Foxies-CSTL]

@Foxies-CSTL did you have UBL enabled when it worked previously? With UBL enabled in the configuration file I think there is extreme risk of movement problems on delta right now.

Yes, UBL is always activated after a G28 and I put a G29Lx in the starting GCode of the filament with a K=0. Another note, when I compile in 32 step mode, the function POWERLOSS no longer works (BugFix 20201229 Bump).

[thisiskeithb]

#23622 should address part of this issue.

Can you download and test the latest bugfix-2.0.x?

[github-actions]

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