Expansion 3HC M906 not working properly

mauriciomartins

Hey!
This is my first topic and I hope to get my problem fixed

I don't know why but my Duet3 3HC is not accepting the stepper motors currents settings... Maybe it's a mistake in the config.g

Do not be alarmed by the size of the printer, it will be really giant ... as soon as I have permission I will publish some photos

Thanks in advance!

Here is the config.g

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Thu Mar 04 2021 11:26:14 GMT+0000 (Western European Standard Time)

; General preferences
G90                                           ; send absolute coordinates...
M83  

M550 P"io_BIG"                               ; set printer name

; Drives
M569 P1.0 S1                                 ; physical drive 1.0 goes forwards | X Front Stepper
M569 P1.1 S0                                 ; physical drive 1.1 goes forwards | X Back Stepper
M569 P1.2 S0                                 ; physical drive 1.1 goes forwards | Y stepper

M569 P0.0 S0                                 ; physical drive 0.0 goes forwards | Front Left Z
M569 P0.1 S0                                 ; physical drive 0.1 goes forwards | Front Right Z
M569 P0.2 S0                                 ; physical drive 0.2 goes forwards | Back Left Z
M569 P0.3 S0                                 ; physical drive 0.3 goes forwards | Back Right Z

M569 P121.0 S1                               ; physical drive 121.0 goes forwards | Front Right Z

M584 X1.0:1.1 Y1.2 Z0.0:0.1:0.2:0.3 E121.0   ; set drive mapping

M350 X16 Y16 Z16 E16 I1                       ; configure microstepping with interpolation
M92 X53.33 Y53.33 Z200.00 E420.00             ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00           ; set maximum instantaneous speed changes (mm/min)
M203 X5000.00 Y5000.00 Z1500.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00           ; set accelerations (mm/s^2)
M906 X2200 Y2200 Z2200 E1350 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 X1920 Y1240 Z1000 S0                     ; set axis maxima

; Endstops
M574 X1 S1 P"!1.i01.in"                        ; configure active-high endstop for low end on X via pin 1.io1.in
M574 Y1 S1 P"!1.io1.in"                        ; configure active-high endstop for low end on Y via pin 1.io3.in
M574 Z1 S1 P"!io2.in"                          ; configure active-high endstop for low end on Z via pin io0.in

; Z-Probe
M558 P0 H5 F120 T60000                        ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:215 Y15:195 S20                      ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138  ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                            ; create bed heater output on out0 and map it to sensor 0
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
M143 H0 S120                                  ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                            ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00                              ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                  ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"121.out1" Q500                     ; create fan 0 on pin 121.out1 and set its frequency
M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"121.out2" Q500                     ; create fan 1 on pin 121.out2 and set its frequency
M106 P1 S1 H1 T45                            ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 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

; Miscellaneous
M575 P1 S1 B57600                             ; enable support for PanelDue

fcwilt

Hi,

~~As I recall the CAN address 121 is the default address for a Duet 1XD expansion board.~~

I should not trust my memory - 121 is for a 1LC.

~~And that board is used for external stepper drivers needing STEP, DIR and ENABLE signals.~~

~~With the external drivers I have used the current is set in the driver itself and not via a M906 command.~~

Frederick

mauriciomartins

@fcwilt Thanks for your reply!
How to set the current in the 3HC itself not using M906?

fcwilt

This post is deleted!

mauriciomartins

I'm not using 1XD I'm using 3HC with 3 integrated drivers...

fcwilt

@mauriciomartins said in Expansion 3HC M906 not working properly:

I'm not using 1XD I'm using 3HC with 3 integrated drivers...

My bad - 121 is the default address for a 1LC - sorry about the confusion - I should not trust to my memory.

In any case for a 3HC a M906 command should work.

Frederick

deckingman

@mauriciomartins Why do you think that the stepper motor current settings are not being applied correctly?

mauriciomartins

@deckingman because it's clear that there's no torque.
I'm using the same type of nema23 in all axis, the 4 Z motors are connected to the 6HC and I can set the current and it's working,
X and Y not, if I replace it with a nema17 just for debugging it works ,but without a strong torque.

fcwilt

@mauriciomartins said in Expansion 3HC M906 not working properly:

because it's clear that there's no torque.

I have a 6HC/3HC setup on my bench which I just started to work with.

I connected one stepper to the 6HC and one to the 3HC.

I made what I believe are the correct entries in config.g.

Both steppers will move with the DWC jog buttons.

The stepper on 3HC has no torque - which is consistent with your experience.

Now to determine why.

Frederick

deckingman

@mauriciomartins Ahh, so the real issue is that your XY motors don't appear to have enough torque. Your configuration file shows that the steps per mm for Z are 4 times higher than for X or Y, so it will effectively have 4 times better gearing - and you have 4 motors for that single axis, yet only one for Y and 2 for X. So comparing the Z axis behaviour to the X and Y axes is hardly fair.

What do you get if you send M906 without any parameters? The console should tell you want the motor currents are.

deckingman

@fcwilt No problems here. I have XY and Z connected to a 3HC expansion board. X and Y are Nema 17s set to 1800mA, Z is a single Nema 23 set to 2300 mA.

mauriciomartins

@deckingman Could you please share your config.g?
Thanks!

mauriciomartins

@fcwilt Thanks for you feedback!
Could you try what @deckingman is suggesting, sending just M906 without parameters to check the motors currents?
Thanks!

fcwilt

@deckingman said in Expansion 3HC M906 not working properly:

@fcwilt No problems here. I have XY and Z connected to a 3HC expansion board. X and Y are Nema 17s set to 1800mA, Z is a single Nema 23 set to 2300 mA.

Interesting. I wonder what the difference will turn out to be.

Frederick

fcwilt

@mauriciomartins said in Expansion 3HC M906 not working properly:

@fcwilt Thanks for you feedback!
Could you try what @deckingman is suggesting, sending just M906 without parameters to check the motors currents?
Thanks!

I rebooted a few times using different M906 values in the config file.

After the reboot I executed M906 from the console and the values reported always matched.

Interesting situation.

Frederick

mauriciomartins

@fcwilt yah, weird behaviour...
Let's try to bring @dc42 to this topic to help us understanding it

deckingman

@mauriciomartins said in Expansion 3HC M906 not working properly:

@deckingman Could you please share your config.g?
Thanks!

I don't how mush use it'll be to you - it's a CoreXYUVAB with a 6 input (that's 6 extruders) mixing hot end. But as you asked......config.g

fcwilt

@mauriciomartins said in Expansion 3HC M906 not working properly:

@fcwilt yah, weird behaviour...
Let's try to bring @dc42 to this topic to help us understanding it

I just returned to my workbench and powered up the boards.

Still no torque from the stepper on the 3HC.

A temp sensor connected to 3HC was reading correctly.

I tried resetting the boards - first M999 B1 and then M999 - no change to the torque.

I cycled power and now the torque was as expected.

I reset the boards again.

The torque was gone and the temp sensor reading was way off.

I cycled power and now the torque was as expected.

It seems to me that a reset using M999 should restore the boards to the same state as cycling power but it doesn't seem to be

Frederick

deckingman

@fcwilt Welcome to my world!

How are you powering the expansion board? Does M122 B1 show anything? All voltages good?

jay_s_uk

@fcwilt how long have you had it?
might be a lazy crystal