Sensorless homing corexy not working since upgrade to RR3

[robbrown92]

So i last used my printer with RR 1.2 just updated and renewed the config and everything works apart from the sensorless homing no matter what i set the motor current to or the sensitivity it just plants into the x home and makes loads of noise i have included my complete config and also the testing macro that i am using.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Wed Apr 22 2020 22:44:08 GMT+0100 (British Summer Time)
 
; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"HEVO"                                   ; set printer name
 
M669 K1                                        ; select CoreXY mode
 
; Network
M552 S1                                        ; enable network
M586 P0 S1                                     ; enable HTTP
M586 P1 S0                                     ; disable FTP
M586 P2 S0                                     ; disable Telnet
M552 P192.168.1.103							   ; set fixed IP
 
; Drives
M569 P0 S1                                     ; physical drive 0 goes forwards
M569 P1 S1                                     ; physical drive 1 goes forwards
M569 P2 S1                                     ; physical drive 2 goes forwards
M569 P3 S0                                     ; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                        ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E420.00             ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00            ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00        ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00            ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                   ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        ; Set idle timeout
 
; Axis Limits
M208 X0 Y0 Z0 S1                               ; set axis minima
M208 X300 Y00 Z200 S0                         ; set axis maxima
 
; Endstops
M574 X1 S3                                     ; configure sensorless endstop for low end on X
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M915 X S5 F1 R0							       ; sensorless homing parameters
 
; Z-Probe
M950 S0 C"exp.heater3"                         ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F100 T2000            ; set Z probe type to bltouch and the dive height + speeds
G31 P25 X36 Y10 Z2.5                           ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20                       ; define mesh grid
 
; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M308 S1 P"e0temp" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M143 H1 S280                                   ; set temperature limit for heater 1 to 280C
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit
 
; Fans
M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                              ; set fan 1 value. Thermostatic control is turned on
 
; Tools
M563 P0 S"E3D V6" D0 H1 F0                     ; define tool 0
G10 P0 X0 Y0 Z0                                ; set tool 0 axis offsets
G10 P0 R0 S0                                   ; set initial tool 0 active and standby temperatures to 0C
 
; Custom settings are not defined
 
 

M400                    ; make sure everything has stopped before we make changes
M574 X1 S3              ; set endstops to use motor stall
M913 X25        ; reduce motor current to 50% to prevent belts slipping
G91                     ; use relative positioning
G1 H1 X-300 F4000 ; move all carriages up 700mm, stopping at the endstops           
G90                     ; back to absolute positioning
M400                    ; make sure everything has stopped before we reset the motor currents
M913 X100 Y100 Z100     ; motor currents back to normal
G1 X0 Y0 F2000          ; centre the head and set a reasonable feed rate
M574 X2 Y2 Z2 S1        ; set endstops back to normal so that homedelta.g works

for some reason when i run the macro it moves the Y axis toward the back?

yes i know it makes more sense to use a physical endstop but it worked when i built the printer and havent easily left space to wire in the additional stop

[dc42]

@robbrown92 said in Sensorless homing corexy not working since upgrade to RR3:

; Endstops
M574 X1 S3 ; configure sensorless endstop for low end on X
M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
M915 X S5 F1 R0 ; sensorless homing parameters

On a CoreXY machine, to use stall detect homing on either X or Y, you must set the stall sensitivity on both the X and Y motors. S2 or S3 is usually about right.

[robbrown92]

I changed the code to

M574 X1 S3                                     ; configure sensorless endstop for low end on X
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M915 X:Y S5 F1 R0							       ; sensorless homing parameters
 

it still runs into the x end and they pushes the y axis back

[robbrown92]

scratch last i changed the sensitivity to S2 and it worked but it also jogged the Y axis back slightly is this a belt tension issue? ps thanks for your help and the speedy responses