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Looks like the swap kills the problem completely. Although I still prefer the relay solution.

There isn't a lot of noise on the step line, +/-50mv which shouldn't be enough to cause steps I would think?

satiowadahc wrote:

Quick confirming I leave the step + disconnected?

Yes.
-
Personally i would find the source of interference and remove or fix it, start by checking grounding and signal cable shielding.

Quick confirming I leave the step + disconnected?

Even with the noise - it over accelerated the motors passed the over torque limit which stopped them.

Adding the relay was my first step and that works pretty well. Has 8ms of reaction time which motors on a test bench show about 30degrees.

I'll try the pin inversion right now in addition.

Thank you!

I suspect that the drives see marginal output levels + drive generated noise as a series of steps.
Marginal output levels are possible with a slow ramp of the power as it drops to 0

Estop should really drop primary power to the drives but not control power. 

Suggestions:

1. Use one 7I96S isolated output to enable all drives. This will go false (off)  on power loss or watchdog bite
so the step/dir states during power-up/power down will not matter.

2. Use the STEP- and DIR- pins (and invert them in hal)

#1 is a more reliable choice

Hi, Troubleshooting a series of mishaps in design.Background.

Problem 1. Operators using power switch as an e-stop.
Problem 2, Killing control power on this machine doesn't kill power to the drives and motors - Welp adding another relay now.
Problem 3, Mesa step and direction signals go high on power loss until the caps die out. (Which is what I'm actually curious about in this thread)
Problem 4, Teknic eclipse drives read a high step as a series of pulses. (Following up with them on that).

7i96s is wired with Step connecting to Step input on eclipse drive and Dir connected to Direction on eclipse. One motor has a RC delay timer on the enable, as the brake takes a moment to engage or the Z-Axis falls under its own weight. While waiting for the brake it jerks very violently.

Is there a way to make the Mesa card step and direction go low on power loss? 

Scope - Green is step, purple is enable delay, 100ms/div
 

I am going to see what we can squeeze out of the Nano9K for now, but its nice to know we can use something with a lot of direct IO in the future if needed. That 20K Lite board is a pretty solid option.

Cheers.
Russell.

1. I would use a good commercial power supply. The 7I97T draws only about 400 mA but the 5V also powers
the encoders which will add to this, I would suggest 2A.

2. The 7I97T has local +- analog power supplies so only requires +5V

3. ENA+ to KL8, ENA- to KL5,  AOUT to KL7,  GND to KL2


The real problem  I see here is the these are unidirectional drives, and reversing with a relay will not work
when trying to hold position at low speeds (the relay is too slow)

What machine is this for and are these the original drives?

Because these drives would make sense for constant speed use but not position control.

The milling machine has been working great so I haven't done any changes to it for several months. However one thing that has been on my mind for a while is that I have no idea how hot it gets inside of the control cabinet during long milling sessions.

A quick search for temperature display brought up this unit on AliExpress for a very low price:

www.aliexpress.com/item/1005005993184685.html

I bought one and it arrived a couple weeks later, here is how it looks installed in the cabinet.

 

 

 

 

It's gonna be interesting to see how hot it actually gets inside the cabinet.

Hello Benny,

That's it now... Thank you very much for your support.

The only thing I had to change was:
- motion.enable
to
- halui.estop.activate

The latest version is now attached. 

Dear members,

my MESA card has arrived. It would be nice, if you could give me some information and direction, My questions are:

#1 Can I use every simple and cheap 5 VDC plug-in power supply unit or is a special quality required? How many Amps are needed?
 
#2 My DC Tacho-Motor amplifiers need an input signal from 0 - 10 VDC for the speed, I would assume, that I have to supply also something like 12 VDC to the MESA card so that the card can provide the +.10V output on TB3 PINs 4, 8 etc.  -  or where does the card get the 10VDC power from?

#3 My DC motor amplifiers (Mattke M1Q 24/5) connections are shown as below. The power for the amplifier and the DC Servo-Motor is provided separately. The only connection to the MESA should be the "Enable+" PIN to KL 8 and the 0-10 VDC set-value to the KL 7 - right?
Is there any critical interference between the GND of the MESA and the GND of the amplifier (because of KL7) to be feared ?
How can the direction of the DC-motor be reversed - would I need some relais to change the motor input cables for the case, that "Enable-" is activated?

Thanks a lot and best regards

Hartwig

 

My XML config is for Rtelligent drives so it will need reworking for your drives

@Marc_P, did you get the document?

Until the official source supports Debian 13, I quickly created the .deb files and created a repo. It works for me. Feel free to test it to see if it works on other computers; then you'd have a temporary alternative to Debian 13.



apt.dryba.com/

My Odroid H2 is now on Trixie.

Insalled rt headers, r8125-dkms, blacklisted r8169.

Touchscreen works.