"Z probe already triggered at the start of the homing move."????

crchisholm

On a coreXY printer:
I have X and Y homing working as I would expect....home X and the bed drops about 10mm, X homes and the bed comes back up. When home X and Y, everything is fine. When I try to home Z, I get the message (above) saying that "Z probe already triggered" and the homing failes. I can't figure out what I have setup wrong. Below is my current config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

M667 S1 ; Select CoreXY mode

; Network
M550 P"Core XY" ; Set machine name
M552 S1 ; Enable network
M587 S"BHNDVW3201B4B28" P"3c5d116a" ; Configure access point. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S0 ; Drive 3 goes backwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80.00 Y99.3639 Z402.6845 E98.00 ; Set steps per mm
M566 X900.00 Y900.00 Z150.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y6000.00 Z380.00 E1500.00 ; Set maximum speeds (mm/min)
M201 X3000.00 Y500.00 Z100.00 E10000.00 ; Set accelerations (mm/s^2)
M906 X950.00 Y950.00 Z950.00 E950.00 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 Y270 Z300 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 H5 F0 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X15:13 Y15:195 S20 ; Define mesh grid

; Heaters
M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 ; 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

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

Phaedrux

Can you post your homing files as well?

What type of probe is it?

dc42

Have you tested your Z probe as described at https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

crchisholm

@phaedrux I don't have a probe. I have an end-stop. That's part of what is confusing me.

crchisholm

Here are the homing files

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-305 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 S1 X-305 F360 ; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Y-275 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 S1 Y-275 F360 ; move slowly to Y axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; 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

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

crchisholm

I say I don't have a probe, but actually I have a BLTouch (still uninstalled and in the original package). I have not printed anything to mount it too yet, so I was hoping to put that off until everything else was setup and working.

Bad Plan???

SupraGuy

@crchisholm said in "Z probe already triggered at the start of the homing move."????:

I say I don't have a probe, but actually I have a BLTouch (still uninstalled and in the original package). I have not printed anything to mount it too yet, so I was hoping to put that off until everything else was setup and working.

Bad Plan???

I wouldn't say that it's a bad plan, particularly if you have everything that you need to get basic printing started without needing the BLTouch sensor to get started.

Adding the sensor isn't too big a deal, and you can always revert back to a known working configuration if you decide that you need to print something else without getting it working.

Phaedrux

@crchisholm said in "Z probe already triggered at the start of the homing move."????:

; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops
; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 H5 F0 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X15:13 Y15:195 S20 ; Define mesh grid

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; 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

You can change your configuration to use a simple endstop for the Z axis for the time being, and setup the BLTouch later once you have the parts printed.

First you'll need to change the quoted config section above to match the following:

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

; Z-Probe
; M574 Z1 S2 ; Set endstops controlled by probe
; M558 P5 H5 F0 T6000 ; Set Z probe type to switch and the dive height + speeds
; G31 P500 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
; M557 X15:13 Y15:195 S20 ; Define mesh grid

Basically just added the Z min endstop to the first M574 command, and commented out the whole z probe section.

For the homing files you'll have to change homez and homeall to not use a G30 command and instead use G1 S1 Z move to seek the endstop.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Z-300 ; seek end stop
G1 Z5 ; back up 
G1 S1 Z-300 F300 ; home Z again slowly
G90 ; absolute positioning
G1 Z5 ; part nozzle 5mm above the bed

SupraGuy

For that matter, you can set upt he printer to use a manual adjustment for the Z probe

M558 P0

This will allow you to use the Z jog buttons in the DWC as the Z probe, adjusting the Z height to 0 manually until you're ready to print the BLTouch parts.

My earlier response was assuming that you had an already complete kit though.

crchisholm

this worked great. Thanks.
One more question, though. Am I right to assume that the Duet supports either am min or max end-stop, but not both?

Phaedrux

@crchisholm you really only need one or the other to home to, afterwards the firmware will enforce travel limits.

You can use one of the other endstops like e0 or e1 and use it as a general trigger endstop to do whatever you want if triggered. They can all be wired together if you use a switch on each axis for max.

crchisholm

@phaedrux question: the code you show above... can it be entered and exicuted directly in the DWC? I have my printer built and all functionality tested except the BlTouch, so I don’t want to do something now that creates a problem (like a crash into the bed). I think I understand the M557 and M558 commands, and a lessor understanding of the G29, G30 and G31 commands but not real confident yet. Ruining this sfuff like console commands would allow me to dip my toes in the process ( I think)

Phaedrux

Yes every command can be run from the console. The config.g is just a list of commands that gets run in order at startup. There's nothing special about it other than that. Any time a new command is run it takes effect.

So you could enter each line one at a time in the console. Or to make for less typing you could enter the commands into a new macro file called BLTouch test and then run that macro. That way if you want to revert just reboot the duet. If it all tests ok you can put the commands into config.g.

The gcode wiki is a good reference to keep on hand for figuring out how the gcodes work.

G29 is for mesh bed leveling.
G30 runs the macro bed.g. and can be used for a number of things like lead screw leveling. It's not required.
G31 defines the XYZ position of the probe in relation to the nozzle tip. So when the probe triggers the system know where the nozzle is.

crchisholm

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crchisholm

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crchisholm

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Scachi

@crchisholm You have your bltouch connected now ?
Check your sensor signal wiring and the value of your probe-z shown in the web frontend.
If it reads 1000 all the time you may have a wiring problem like bad crimp or using the wrong polarity of your probe signal cable or something like that.

Check the documentation and all the test and probe release reset command mentioned there:
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_BLTouch

crchisholm

I don't know why I am having trouble typing here, but what I actually entered in DWC was...
M557 X0:200 Y0:200 S50
M558 P9 H5 F100 T6000
G32
and I get the Z Probe already triggered before probing move started.

Phaedrux

@crchisholm what do you have in bed.g? That's what gets run when you send g32

crchisholm

@scachi Well, you called that one correctly! I have continuity on four or the five wires all the way from the termination point back to the jack on the BLTouch connector. The white wire does not. I am not sure what I can do about this as my eyes are just not up to working on a connector that small. I may have to return the device back to Amazon and order another. This is frustrating, but then, no body forced me to build this printer. Crap