motor-0-position error beim Abbremsen aus 4-7,5 m/min

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30 Apr 2025 17:55 #327374 by Muftijaja
Chaka!
Today I tested the new i7 Tiny PC Lenovo m910q with previously shown pings and latency, and the machine seems to work fine. Ok, I just made an air milling over 10 minutes, but the whole code went through without motor-position errors. I tried full G0 with 7,5m/min and normal milling feeds with 3,5m/min, no errors anymore.
BTW- WLAN connection was active during the process, without activity, but former constellations had bad influence on ping and latency.
I hope, this is my final post regarding latency and pings. I learned a lot about settings.

Big Thank you to all of you for sharing your knowledge and for helpful comments!
Happy greetings, Hanno

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20 Nov 2025 14:57 #338801 by Muftijaja
Hi rodw, Im sorry to bother you - the link to your doc in google docs is deleted, can you please tell me where I can find this again actually? I'm again struggling with packet losses.
docs.google.com/document/d/1jeV_4VKzVmOI...diY/edit?usp=sharing is deleted.

Thanks for your efforts!
Hanno

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25 Jan 2026 16:26 #341900 by andrax
Hi,

dein Fehler könnte möglicherweise noch eine weitere Ursache haben.
Da dies beim abbremsen und hohen Geschwindigkeiten passiert, kann es sein, dass dein Servotreiber die überschüssige Generatorenergie 
vom Servomotor nicht wegbekommt und sich dabei der Zwischenkreis entläd.
Hast du Bremswiederstände installiert?
The following user(s) said Thank You: tommylight, Muftijaja

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25 Jan 2026 22:23 #341916 by tommylight
Did you try lowering the acceleration?
The default of 750mm/s/s is to much for some machines.
The following user(s) said Thank You: Muftijaja

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29 Jan 2026 20:54 #342173 by Muftijaja
Moin Andrax, die Idee ist super. Tatsächlich habe ich beim Servo den zugehörigen Bremswiderstand aber immer angeschlossen gehabt.
Dagegen spricht, dass ich die gleichen Abweichungen beim Tausch auf einen 3,5 Nm CL Stepper auch hatte.
Momentan hab ich noch Winterpause, meine Garage mit der Fräse ist nur 8° kalt, das ist zu ungemütlich um da große Diagnostik zu machen.

Was ich schon vorbereitet habe ist der (vorübergehende) Wechsel von LCNC zu einer Estlcam Controller Karte, bei der man nichts verfusen kann an Motoreinstellungen. ICh will wissen, ob ich weiter an der MEchanik suchen muss oder in der Konfig von LCNC. Aber auch dafür brauche ich etwas mehr Temperatur im Raum. Danke für Deinen Input,ich melde mich wieder!

Hi Andrax, that's a great idea. Actually, I always had the corresponding braking resistor connected to the servo.
The downside is that I had the same deviations when switching to a 3.5 Nm CL stepper.
I'm currently on winter break, and my garage with the milling machine is only 8°C, which is too uncomfortable to do any major diagnostics.

What I have already prepared is the (temporary) switch from LCNC to an Estlcam controller card, where you can't mess up the motor settings. I want to know whether I need to continue looking at the mechanics or at the LCNC configuration. But for that, I also need a slightly warmer room temperature. Thanks for your input, I'll be in touch!

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29 Jan 2026 20:58 #342174 by Muftijaja
Dear tommylight, well, I didn't try that until now. I will have that in mind if I get back to my machine at better temperatures. Actually, I have something around 8°C thats not very comfortable for sitting and fiddeling in my garage.
I will come back asap.
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29 Jan 2026 23:26 #342181 by tommylight

Actually, I have something around 8°C thats not very comfortable for sitting and fiddeling in my garage.

Well, 3 days ago this was me in my shop and the temperature was 4 degree C, in a t-shirt for 20 to 30 minutes at a time, nearly 2 hours in total "freezing" time.
Recorded a PC build as i had several PC's to build and i rarely record anything, so this time called the services of my brothers photo/video studio, so it should be good.
Attachments:

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29 Jan 2026 23:57 #342183 by rodw
Well 41.8 degrees C here a couple of days ago. A far cry from the -20 degrees C we experienced in Canada at the end of December!

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31 Jan 2026 17:50 #342255 by andrax
Ich bin gerade den Thread nochmal durchgegangen:

Zitat:
Folgendes Problem nervt mich gerade: Ich verfahre per Handrad die X Achse, tw mit vollem G0=7,5m/min, das läuft gut, aber beim Bremsen aus Feeds ab 4m/min kommt fast immer der Fehler motor-0-position error. Auf allen Achsen kommt dieser Fehler.
Ich habe 400W Servos von OMC Stepperonline, die autark ihre Rampen steuern,
LCNC bekommt davon nichts mit, die sehen für LCNC ja aus wie Stepper. Keine Glasmaßsstäbe/Encoder zusätzlich.

Ich habe da so einen Verdacht.
Werfe mal Halscope an und beobachte die actual-position, target-position und den Schleppfehler.
Zusatzfrage: Hast du irgendwelche Einstellungen an den Stepperonline vorgenommen? 
 

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