Troubleshooting RPi + mesa 7i76e + omc steppers

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06 May 2022 10:44 #242118 by Jeremie
Hello everyone,

I'm trying to build a 3 axis CNC based on a killerbee  mechanical kit. It is the first time I'm building such a thing. I've decided to really on linuxcnc in order to learn as much as possible on all topics from electrical to electronics and how to build an autonomus machine in general that could help me to tackle more ambitious wookworking projects. 

Actual setup
The problem


I'm struggling at troubleshooting what's wrong with my setup. To summarize what i've done so far
1. create a basic config for the mesa with all values by default in order to make the X motor moves
2. use the X axis tune for find the right values to prevent the drivers to to itself in safety mode (it blinks 7 times)

Based on the driver documentation blinking 7 times means any of this situation
  1. The acceleration time setting is too small, increase the value of appropriately;
  2. Motor torque is not enough or motor speed is too high;
  3. Motor wiring error, check wiring
I've tried all of these without sucess.

I've got the impression that I miss something big but I can't tell what. Do you have any idea on how to troubleshoot this?

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06 May 2022 10:46 #242119 by Jeremie

www.youtube.com/shorts/4NNmbMMivDk please find in real what's happening.

Thanks in advance for your help!

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06 May 2022 12:17 #242129 by andypugh
Can you attach the HAL and INI files?

It seems like the acceleration and/or velocity settings are too high, and the motor is immediately stalling.


But it is also possible that the motor is wired incorrectly.

**** Power off the drives before disconnecting the motor *********

Check, with a multimeter, that A+ and A- are connected in the motor, and the same for B+ to B- (assuming a 4-wire stepper)

If it is a 6 or 8-wire stepper then there is even more scope to get things wrong. I have had 8 wire steppers where the wire colours did not match the datasheet.
The following user(s) said Thank You: Jeremie

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06 May 2022 13:08 #242134 by spumco
The following user(s) said Thank You: Jeremie

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06 May 2022 14:39 #242144 by itsme
Wrong Encoder or Motor wiring...

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06 May 2022 15:07 - 06 May 2022 15:09 #242147 by Jeremie
First of all, thanks everyone for your reactivity this is much appreciated :) 

Indeed, it was a wiring problem of the encoder, the pinout was wrong like Spumco suggested it in another topic.

I thought I could trust OMC but in the end nothing could replace an exhaustive continuity testing of all motors.    
Last edit: 06 May 2022 15:09 by Jeremie.

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15 Oct 2022 15:46 #254175 by Keincncnewbie
Hi, guys rookie in the CNC world!

I have the same problem I checked my wiring, and everything is good but when I power everything up motors make a sound like they lock their position but when I tried to the controller using linuxcnc nothing moves.

I'm using mesa 7I92H with 7I76/7i76D.

thanks!

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15 Oct 2022 19:30 #254190 by PCW
First suspects would be:

1. Power to 7I76 (are 7I92 and 7I76 jumpered properly for 5V the power setup?)
2. Drive wiring (re-check)
3. Too short step pulse length (start with double the drives spec)

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