Thanks all becomes clear now. It was right there in black and white in the wiki but just didn't see it no matter how many times I looked at it. (Probably coming from a MKS Base 1.4 where the BLT does connect as a Z Endstop - thats my excuse anyway). Peirof - this might be your solution too!

So I changed M558 P5 X0 Y0 Z1 H5 F100 T2000 to be M558 P4 X0 Y0 Z1 H5 F100 T2000 and used the E0 Stop connector now everything works as it should and I have successfully homed Z for the first time. Is there an issue with the Z Stop connection?

On start up the BLT does a self test of deploying and retracting the probe twice. The red internal LED is on and the probe finishes in the retracted position. I have another BLT on my old Tevo Tarantula (running Marlin) that does exactly the same thing on power up so all looks good from that perspective.

I have now got the stage of testing Z homing with a BL Touch Smart however I seem to be in the same space as "Peirof" in that I can make the BLT respond correctly to the commands M401, M402 and it runs the M280 test and reset routines so I'm happy that the servo side is set up properly but I cant seem to make any sense of the ZProbe bit.

When I try to do a G30 or Home Z the Duet stops and reports that the Z probe is triggered before it starts moving the Z axis.

I followed the instructions in the Wiki and checked the wiring all seems OK however the Zprobe value displayed on the Webpage always stays at 1000 no matter what state the probe is in and is shown on a pink background like there is an error of sorts. Its the same if I remove all connections to the Z-probe and the same if I short "Zstop" to either the "Gnd" or +3.3V on the board. The board does recognise a trigger when I short "Zstop" to "Gnd" as the Z probe endstop LED changes. I can also just barely see the LED flash when the BLT probe is triggered so it looks like the hardware side of things is happy but there's something I'm missing in the config file.

Grateful for any help trying to sort this out. Here is my config file:

Configuration file for Duet WiFi (firmware version 1.17 to 1.19)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Wed Nov 01 2017 22:28:59 GMT+0100 (W. Europe Standard Time)

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates…
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M307 H3 A-1 C-1 D-1 ;

M667 S1 ; Select CoreXY mode
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X290 Y290 Z390 S0 ; Set axis maxima

; Endstops
M574 Z0 S0 ; Define active low and unused microswitches
M574 X2 Y1 S1 ; Define active high microswitches
M558 P5 X0 Y0 Z1 H5 F100 T2000 ; Set Z probe type to BLTOUCH, the axes for which it is used and the probe + travel speeds
G31 X0 Y0 Z0 P25 ; Set Z probe trigger value, offset and trigger height
M557 X15:275 Y15:275 S20 ; Define mesh grid

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z2000 E420 ; Set steps per mm
M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 E1200 ; Set maximum speeds (mm/min)
M201 X500 Y500 Z250 E250 ; 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

; Heaters
M143 S245 ; Set maximum heater temperature to 245C
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4725 C7.060000E-8 R4700 ; Set thermistor + ADC parameters for heater 1

; 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

; Network
M550 PH.EVO ; Set machine name
M552 S1 ; Enable network
M587 S"" P"********" ; 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

; Fans
M106 P0 S0 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
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Custom settings are not configured

Just to close this issue…turns out I had decided that 3mm/s z axis speed was way too slow so had set it to 30 mm/s so the problem was that I was just trying to drive the steppers way too fast.

Errr slightly embarrased now as I went back to it to have another fiddle after writing the post and its all working again, the only thing I can think of either a dodgy connection or I tweaked something wrong in setting up the firmware. All I did was download a basic set up from reprap and try to run a single motor off a known good cable and all was OK. I then removed the jumpers added the second stepper in and both worked OK but were quite noisy. Maybe I was trying to drive the steppers too fast because now I've tweaked the Esteps value to something closer to the eventual calibration setting and is back to its super quiet norm. Slightly bemused but happy

Hi all new to this forum and Duet3d and I have a problem with my recently purchased duet wifi. I'm building a Hypercube Evo and partly wired up the Duet board to test the motion. All worked well I tried the z axis on a single stepper and then later a dual stepper all worked OK. I then shifted to test the XY motion and that worked OK. The problem came this evening when trying to run both X,Y and Z axis - while X and Y worked fine, the Z axis was moving slightly then stopping, I intially thought it was binding or one motor was fighting the other and when I checked the connections while the continuity was OK, somehow one of the cable was wired wrongly, so I fixed that and thought it would work but it doesn't in dual configuration I can get one motor to run unloaded but there isnt any power to drive the axis also is suddenly very noisy whereas before it was very quiet. So Ive swapped cables, swapped motors and eventually configured E0 to run the z axis which successfully proved the z axis channel has a fault. Is there any further diagnosis I can do I don't really want to write it off so early into the build - I thought the drivers were bullet proof (the wiki tends to make you believe that you would have to try pretty hard to destroy something) so I'm surprised that it looks like I have killed it even though I took precautions to always power down while changing connections. I also noticed a little red LED between the drive connectors was lit - is that significant as I have come across any documentation for it?