External driver and Duet 1XD issues

p_vnct

Hello there,

i am trying to set up an external driver DM860T connected to 1xd board with a duet 3 6HC.
I have wired the external driver to 1xd in differential connection.
I have assigned this motor to U axis for easier testing but it will be the extruder motor.

i not able to make any move of this motor (nema34) with the external driver.

I have tried different combination of M569 S, R and T parameters as well as different microstepping or steps/mm but nothing happens when i try to move U axis

Also tried different pulse/rev on the stepper

Here is my config file :

; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"BIG 2"                          	 ; set printer name
G4 S2 										 ; wait for expansion boards to start


; Network
M552 P192.168.1.198 S1                             ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                   	   ; enable HTTP
M586 P1 S0                                   	   ; disable FTP
M586 P2 S0                                  	   ; disable Telnet

; Drives
M569 P0.0 S0                                     ; physical drive 0.0 goes forwards X
M569 P0.1 S0                                     ; physical drive 0.1 goes forwards Y
M569 P0.2 S0									 ; physical drive 0.2 goes backward Y2
;M569 P0.3 S1                                    ; physical drive 0.3 goes forwards Extruder
;M569 P0.4 S1								     ; physical drive 0.4 goes backwards Extruder
M569 P0.5 S1                                     ; physical drive 0.6 goes forwards Z
M569 P122.0 T2.7:2.7:2.7:2.7;					     ; Set External Driver for Extruder
M569 P122.0 S0 R0;

M584 X0.0 Y0.1:0.2 Z0.5                          ; set drive mapping
M584 U122.0                                      ; set drive mapping extruder
M350 X16 Y16 Z16 I1                              ; configure microstepping with interpolation YXZ
M350 U1 I1                                     ; configure microstepping with interpolation E
M92 X320 Y320:320 Z640.00                        ; set steps per mm XYZ
M92 U400.00                                     ; set steps per mm
M566 X300 Y300 Z120.00 U120.00                   ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z3600.00 U10000.00      ; set maximum speeds (mm/min)
M201 X200.00 Y200.00 Z1000.00 U3000.00           ; set accelerations (mm/s^2)
M906 X4000 Y4000:4000 Z4200 I30                  ;set motor currents (mA) and motor idle factor in per cent
M84 S30                                      	 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 U0 S1                              ; set axis minima
M208 X1120 Y1000 Z1280 U2000 S0                  ; set axis maxima

M122 gives this result :

M122 B122
Diagnostics for board 122:
Duet EXP1XD firmware version 3.4.4 (2022-10-14 11:45:39)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
All averaging filters OK
Never used RAM 5556, free system stack 88 words
Tasks: Move(notifyWait,0.0%,153) HEAT(notifyWait,0.1%,115) CanAsync(notifyWait,0.0%,64) CanRecv(notifyWait,0.0%,77) CanClock(notifyWait,0.0%,64) MAIN(running,96.5%,441) IDLE(ready,0.0%,40) AIN(delaying,3.4%,144), total 100.0%
Last reset 00:03:44 ago, cause: power up
Last software reset data not available
Driver 0: pos 0, 400.0 steps/mm, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, step errors 0, maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0
Peak sync jitter 1/5, peak Rx sync delay 198, resyncs 0/0, no step interrupt scheduled
VIN voltage: min 36.9, current 36.9, max 37.0
MCU temperature: min 21.4C, current 23.3C, max 23.4C
Last sensors broadcast 0x00000000 found 0 86 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 1700, send timeouts 0, received 1056, lost 0, free buffers 37, min 37, error reg 0
dup 0, oos 0/0/0/0, bm 0, wbm 0, rxMotionDelay 0

What am i missing ?

droftarts

@p_vnct Most likely, if you have connected the enable wires, disconnect them. From the datasheet:

Enablesignal: This signal is used for enabling/disabling the drive. High level (NPN control
signal, PNP and differential control signals are on the contrary, namely low level for enabling.)
for enabling the drive and low level for disabling the drive. Usually left UNCONNECTED
(ENABLED).

https://www.omc-stepperonline.com/download/DM860T.pdf

Ian

p_vnct

@droftarts Just tried to disconnect the enable wires.

no difference still not moving

droftarts

@p_vnct It looks like your timings might be a bit fast:

M569 P122.0 T2.7:2.7:2.7:2.7

a)t1: ENA must be ahead of DIR by at least 5us. Usually, ENA+ and ENA- are NC (not connected). See
“Connector P1 Configurations” for more information.
b)t2: DIR must be ahead of PUL effective edge by 5us to ensure correct direction;
c)t3: Pulse width not less than 2.5us;
d)t4: Low level width not less than 2.5us.

Try M569 P122.0 T5:5:10:10, and if that works, work down to T2.5:2.5:5:5.

Ian

p_vnct

@droftarts said in External driver and Duet 1XD issues:

T5:5:10:1

Thanks Ian, it is working now with T5:5:10:10 for timings.
Doesn't work with lower timings.

I had also to remove M92 for the U axis and modify the R parameter to R1 in M569 to get it work.

droftarts

@p_vnct Did you reconnect the enable wires, and that part is working?

Ian

p_vnct

@droftarts No i didn't !

dc42

@p_vnct said in External driver and Duet 1XD issues:

I had also to remove M92 for the U axis and modify the R parameter to R1 in M569 to get it work.

That should only matter if you connected the Enable wires.

@p_vnct said in External driver and Duet 1XD issues:

it is working now with T5:5:10:10 for timings.

According to the data sheet, it should work with 2.5:2.5:5:0. What wiring scheme did you use between the 1XD and the driver?

p_vnct

@dc42

About the R parameter, you are right this should matter only with the Enable wires, but with R1 and the enable wires connected it didn't work.

I used the differential wiring without the enable wires and if i go 2.5:2.5:5:0 timing values it does not work anymore.

dc42

@p_vnct said in External driver and Duet 1XD issues:

I used the differential wiring without the enable wires and if i go 2.5:2.5:5:0 timing values it does not work anymore.

In that case, it appears that the driver isn't meeting its specification. Just to check, if you set 2.5:2.5:5:5 and then send M569 P122.0 with no other parameters, what timing does it report? The first figure should be quite accurate, but the other figures will be rounded up to the next available value.

p_vnct

@dc42 Late response apologies !

M569 reports 2.7:2.7:2.7:2.7.
but when i enter this values the motor do not move anymore.

I have worked down to T4:4:4:4 and the stepper moves.

But i have a feeling that something lower the torque of the motor.
Indeed the nema 34 is rated 13Nm under 60v @ 2000steps/rev.

But i clearly do not have this torque available, what could influence the torque in the duet settings ? i guess not very much as this is related to the external driver, right ?

jay_s_uk

@p_vnct said in External driver and Duet 1XD issues:

i guess not very much as this is related to the external driver, right ?

correct

dc42

@p_vnct said in External driver and Duet 1XD issues:

But i have a feeling that something lower the torque of the motor.
Indeed the nema 34 is rated 13Nm under 60v @ 2000steps/rev.

The torque is determined by the motor current, which is set by your external driver. Most external drivers have switches to set the current.

btw the 6HC can drive many Nema 34 motors directly, without the need for an external driver.

p_vnct

@dc42

actually i drive a nema 34 from another Duet 6HC on another similar printer . but found that i do not use the entire torque of the nema as the Duet is "limited" to 36v and 4A.

As this Nema 34 is used for a pellet extruder, i am currently trying to drive it (on my second upgraded pellet printer) with the external driver set up at 6A-7.2A peak on 60V to see if i can achieve better flowrate and without a planetary gearbox.

For now without the planetary gearbox i cannot extrude at an acceptable flowrate with the external driver nor the drivers on the 6HC.

I'll try with a planetary gearbox like my first printer but with the external driver and see if i get better results with it.

Another thing i quickly tried but without success is to set up a second extruder motor but drived from the 6HC.
I think i don't have the right syntax for that.

Because if i map :

M584 E122.0:0.4

Then what should i set in :

M350 E??:16 I1       
M92 E??:100           
M906 E??:1000 I30

As if i understand correctly those values are now set on the external driver ?

p_vnct

@p_vnct

i Have tried :

M584 E122.0:0.4
M350 E1:16 I1
M92 E14.00:100.00
M906 E0:1500 I30

Motor on external driver is working but not the second one, even if the duet report it moving.

EDIT: my bad , i just forgot to add the drive to M563... now it is working

dc42

@p_vnct thanks, I'll mark this as solved then.