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  • mlcupen
  • mlcupen
10 Nov 2025 17:43
Replied by mlcupen on topic Ethercat drive configuration woes

Ethercat drive configuration woes

Category: EtherCAT

Did you start the motor?
  • mlcupen
  • mlcupen
10 Nov 2025 17:41
Replied by mlcupen on topic Ethercat drive configuration woes

Ethercat drive configuration woes

Category: EtherCAT

Hello,
I'm trying to start the motor but it's not working, I tried via halrun and via sudo ethercat upload -p and motor enters OP, but it doesn't accept OP_STATUS, always 0, and the motor dont move, please can you help me somehow.
  • peterpan
  • peterpan
10 Nov 2025 17:32 - 10 Nov 2025 17:33
Replied by peterpan on topic Trouble with Cia402 drive configuration

Trouble with Cia402 drive configuration

Category: EtherCAT

I have been trying to solve these problems on my own with very little headway:

When the Servo moves 2 inches, LinuxCNC registers it as ~6.5inches regardless of the encoder_scale value

joint following error when I try to jog over ~60in/min (linuxcnc units)

joint following error when try to home (probably related)

I haven't even gotten to the real configuration and am already failing :'/
Help is appreciated
  • PCW
  • PCW's Avatar
10 Nov 2025 17:14
Replied by PCW on topic THC Plasma

THC Plasma

Category: Deutsch

1. there is no issue changing the firmware (unless you needed the 7I74)

2. 150V full scale should be OK though it may give less margin for sensing ARC OK if you don't have an
ARC OK signal from the plasma source. You can use any divider but /32 is suggested for best noise immunity
If you use /1 you must reduce the encoder filer time constant (so not suggested)

3. Yes, for 7i96s_7i74 or 7i96s_d or 7i96s_dpl firmware, the "A0" encoder input
is always on TB2 pins 7,8 (you can check by looking at the .pin files in the firmware directory)
  • dgdodo
  • dgdodo
10 Nov 2025 16:32 - 19 Nov 2025 01:19
[SOLVED] Backlash issues on Y-AXIS was created by dgdodo

[SOLVED] Backlash issues on Y-AXIS

Category: Advanced Configuration

Backlash not working anymore in LinuxCNC v2.9.x

Build my own laser CNC machine about 4 years ago, which worked fine with LinuxCNC 2.8.2.
Using an RPi 3B+, laser and 2 x L293D controllers and 28BYJ-48 steppenmotors.

After trying to update Debian to trixie the SD-card would not boot anymore, so build new one (back to Bookworm).
(Although i can get the old data from LinuxCNC of the card.)
Debian Trixie is not that RT compatible as written all over, still need an RT version to run LinuxCNC on RPI 3B+.
Pitty there is no complete RPi 3 (only 4 and 5) version of LinuxCNC available anymore?

After installing LinuxCNC v2.9.6 (on Debian Bookworm) I could not get the machine working as it did with v2.8.2.
I also changed X-axis steppenmotor with a spindle drive to make it more accurate, this works fine (backlash between 0.1 - 0.3),
but after this I still have trouble with the Y-axis (on which i did not changed anything).
Before (v2.8.2) the Y-axis had a backlash of 1.315, but now I can not get it right anymore.
It looks like the backlash is now only working in 1 direction and I do not see the backlash correction back on the motor movement.
Even if I make the backlash much bigger, just to see if is really done by the motor.
It only draws (i.e. circles) bigger, but the error stays (see IMG_4618a.JPG with BL of 1, 2 and 3)

My question is what has been changed in v2.9.x according the backlash, as I only find 'improved'.
In my case it is not improved but getting worse.
Maybe the new changes do not work with my controllers (L293D)?
And how to solve this weird issue.

Reagrds, DG 

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