huge noise Only when homing Z...

Prusa i3 clone, ramps 1.4, Marlin 2.0

Recently I am experience an issue only when homing Z.
When I press home Z, it moves a little (variable, but not more than 2-3mm) than it stucks and returns a big noise.
To get rid I have to disconnect and reconnect the printer.
The strange thing is that if I move with Pronterface the Z axis (even 10mm) it NEVER gives this issue.
Only when homing.
Here is a video of the issue: VimeoVideoLink
Any idea?
Thanks a lot.

you haven't set a max feed rate for z, the move accelerates till it exceeding the capabilities of your machine. then tha axis just buzz and howl.

pronterface always uses feed rates in the GUI for manual moves.

Edited 1 time(s). Last edit at 10/26/2020 05:51AM by Dust.

Quote
Dust
you haven't set a max feed rate for z,

You always have an incredible knowledge. Thank you.
Will try: M203 Z100 if I understood correctly.
And I will try to store it in the firmware.
Thanks again,
Gaetano

/**
 * Default Max Feed Rate (mm/s)
 * Override with M203
 *                                      X, Y, Z, E0 [, E1[, E2...]]
 */
#define DEFAULT_MAX_FEEDRATE          { 500, 500, 3, 45 }

//#define LIMITED_MAX_FR_EDITING        // Limit edit via M203 or LCD to DEFAULT_MAX_FEEDRATE * 2
#if ENABLED(LIMITED_MAX_FR_EDITING)
  #define MAX_FEEDRATE_EDIT_VALUES    { 600, 600, 10, 50 } // ...or, set your own edit limits
#endif

I have checked the actual configuration. It seems '3'. in the Marlin firmware.
Is there any command to know if this value was successfully uploaded the firmware?
And if so, according to my issue, what value do you suggest me to provide?
Thanks.
G.

feed rate in pronterface is in mm/min
feed rate in marlin is in mm/s

100mm/min = 1.6mm/s

so M203 Z1.6

M503 will display all settings

Edited 1 time(s). Last edit at 10/26/2020 06:48AM by Dust.