z-stop not triggering

Plop

Hi all,

Newby here, I'm afraid. I've got a DuetWifi board for a core XY printer. The z-min stop for some reason is not triggering when I query it (x and y are fine).

It is not the wiring or the switch as it is recognised by the software if connected to either x-min or y-min stops. Is there something wrong with the DuetWifi board? Do I need to re-map the input read by the software (i'm not using the max-endstops)? If so, how do I go about this?

I use the 2.02 firmware version

Thanks

Plop

Phaedrux

Can you post your config.g?

When you click the switch by hand does it trigger the Z endstop LED on the board?

Plop

Just checked. The z-stop led comes on when the trigger is pressed, just like the x and y stop leds for their respective switches.

config.g and homez.g attached

config.gcode
homez.gcode

Thanks

Plop

Phaedrux

You're configured to use a Z Probe, not an endstop.

Do you have a Z probe?

homez
G91              ; relative positioning
G1 H2 Z5 F6000   ; lift Z relative to current position
G90              ; absolute positioning
G1 X15 Y15 F6000 ; go to first probe point
G30              ; home Z by probing the bed

config
; Endstops
M574 X1 Y1 S0                                   ; set active low and disabled endstops
M574 Z1 S2                                      ; set endstops controlled by probe

; Z-Probe
M558 P1 H5 F120 T6000                           ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z2.5                             ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20                        ; define mesh grid

Plop

Ah - that makes sense! I do have a z-probe but I haven't got to the configuration point where that is anywhere near operational. I'll work on it. Thanks for your help! I'll learn (hopefully)

Phaedrux

If you need to change your config to use a Zmin endstop you'd need to make the following changes to the sections I quoted above:

homez
G91              ; relative positioning
G1 H1 Z-500 F6000   ; Move Z axis to endstop
G1 Z3 ; back off endstop
G1 H1 Z-500 F360 ; hit endstop again slowly
G1 Z3 ; back off endstop

config
; Endstops
M574 X1 Y1 Z1 S0                                   ; set active low and disabled endstops

You can leave the zprobe section as is, or add a ; to comment it out.