Is there any rules/formulas you need to use when configuring the instantaneous speed change, Acceleration and Max speed in the config files for x and y?

at the moment we are running instantaneous speed change at 500mm/s, Acceleration 60mm/s, and Max speeds at 4800mm/s on both axis

When I have changed instantaneous speed change to 600mm/s, we seem to lose steps, and the print starts around 1 meter away from where it should be. When changing the other 2, it starts to print in the wrong place, and when moving, a high(ish) pitch noise is made

Is there a maximum speed embedded in the firmware?
When jogging the axis, they do seem to move slow, and our slides are rated that they can go up to 5 m/s.
Or could it be that the motors are struggling? We have nema 23's with a 10:1 gearbox on the x and y

Can anyone shed some light on our current config file? All of the motors are currently working, except for the extruders, along with the heaters and temp probes (we have tried thermocouples and thermistors). We do have a daughter board but not tried it yet

We started off using the online configuration tool, but have had to change plenty of things to get it working, but it is just this problem (which is hopefully something simple).
The extruder has worked in the past when we initially got everything talking and running a gcode, but they only turned at the end of the print (that was before we changed the config)

; Configuration file for Duet WiFi (firmware version 1.17)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Mon Mar 27 2017 16:43:36 GMT+0100 (GMT Daylight 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
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X1200 Y2300 Z900 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 Z1 S0 ; Define active high microswitches
M558 P1 X0 Y0 Z0 H5 F120 T9000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X15:2285 Y15:2085 S20 ; Define mesh grid

; Drives
M584 Z5 ; Apply custom drive mapping
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P5 S0 R1 T2 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
M350 X16 Y16 Z10 E16:16 I1 ; Configure microstepping with interpolation
M92 X213.33 Y213.33 Z5000 E495:495 ; Set steps per mm
M566 X900 Y900 Z50 E120:120 ; Set maximum instantaneous speed changes (mm/min)
M203 X48000 Y48000 Z100 E1200:1200 ; Set maximum speeds (mm/min)
M201 X100 Y100 Z20 E50:50 ; Set accelerations (mm/s^2)
M906 X2000 Y2000 Z2000 E600:600 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Heaters
M143 S260 ; Set maximum heater temperature to 260C
M140 H-1 ; Disable heated bed
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M305 P2 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 2

; 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
M563 P1 D1 H2 ; Define tool 1
G10 P1 X0 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

; Network
M552 S0 ; Disable network

; 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 H1:2 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1:2 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Custom settings are not configured

I have just looked at the tfree, tpost, tpre files and I am guessing that they are the issues, but not sure what needs to go in there.
tfree is
; tfree0.g
; called when tool 0 is freed
;
; generated by RepRapFirmware Configuration Tool on Mon Mar 27 2017 16:43:36 GMT+0100 (GMT Daylight Time)

tpost is
; tpost0.g
; called after tool 0 has been selected
;
; generated by RepRapFirmware Configuration Tool on Mon Mar 27 2017 16:43:36 GMT+0100 (GMT Daylight Time)

; Wait for set temperatures to be reached
M116 P0

tpre is
; tpre0.g
; called before tool 0 is selected
;
; generated by RepRapFirmware Configuration Tool on Mon Mar 27 2017 16:43:36 GMT+0100 (GMT Daylight Time)

we might of cracked it, but the paneldue screen is now just a blank screen. Is there some kind of way to do like a factory reset (like hold down the reset button for x seconds)?

With the microsteps, does it come from the geckodrive which is 10microsteps, or the onboard driver on the wifi?

We are struggling with steps per mm with our z axis with a 20mm pitch leadscrew.

Wondering if it is the pulse? at the moment the command is M569 P5 S0 R1 T2 not sure if that looks right or not. There aren't many examples online with a T value

that is what we first tried, but with no luck, which is why we tried E2Stop

have sorted it now in the homez file

Our Z axis is controlled by an external stepper (using the E2 pins), and is talking with the board, our next job is the endstop for this.
We are connected via the expansion pins to E2_Stop and also GND (using the same principle as below which is working).
Our X and Y uses the onboard drivers and the endstops are working correctly using only their own GND and STOP pins

So I'm guessing that we need to change the commands, but to what?
M574 X1 Y1 Z1 S0 ; Define active high microswitches
M558 P1 X0 Y0 Z0 H5 F120 T9000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X15:2285 Y15:2085 S20 ; Define mesh grid

is the disable pin on the driver used?
I have seen on web that people with CNC machines not using this pin
When I use the pin, the motor free wheels and the error light come on, and when I don't use it, it doesn't, and there is current going to the motor (so it isn't free wheeling)

Gecko say this terminal will force the winding currents to zero when tied to the step and direction

Due to us using a large stepper motor for our z axis (a 4A nema 34), we are going to use an external driver, a gecko G203V.
Just need a little help of connecting it.
The connectors on the driver are as follows:
1- power gnd, 2 - 18to80vdc, 3-6 are for the motor, 7 - disable, 8 - DIR, 9 - Step, 10 - Common, 11 & 12 current set

The wires from the driver to the motor is fine, the 2 current set connectors on the drive is done using a resistor.
But its the wiring from the expansion board to the driver that we need help with.

Looking at the Using external drivers page, I guess that pin 5 goes to no 9 on the driver, pin 6 connects to no 8 on the dirver.
That is as far as we have got

Thanks
I have seen else where on the forum that you've said that a 2.8A motor is reasonable for a wifi board. When you say that, is that at the upper end of the limit, or would the board just about cope with a 3A motor?

We have been using 3D printers for around 18 months now, starting with Ultimakers, then progressing onto larger Gigabot printers We are now looking at going bigger and are building our own (print bed of 2.1x1.2x1m). But we are new to building from scratch. The frame is being build and we are now doing a shopping list, and it looks like the Duet WiFi is the board we will be using.
Due to the size, the stepper motors will need to be a bit beefier that the Nema 17 (that is what our 3 gigabot printers use). I have read that the Nema 23 stepper motors are suitable for this board, but will the Nema 34 motors work?