Problem with delay DIR-STEP

Nikolay81 · Posted at 2018-8-11 01:14:07

Last edited by Nikolay81 In 2018-8-13 03:41 Editor

ytliu Posted at 2018-8-10 07:22
The current motor drive signal generation logic is: in each signal processing period (t), the DIR si ...

I wrote a new article for you.
I hope it will help you better understand the reasons for missing the steps and find a good solution.
This problem is quite difficult to understand. Perhaps machine translation will distort the meaning of some phrases.
But I'd better do it until I can.
Please read the article and tell us your opinion about it.

https://drive.google.com/open?id ... 9uvzhUmf3IJdtMNvpR_

Nikolay81 · Posted at 2018-8-11 14:47:19

Last edited by Nikolay81 In 2018-8-11 15:03 Editor

ytliu Posted at 2018-8-11 06:24
Thank you very much for your analysis of this issue, I will use the first way you said to make cha ...

Thank you, for your desire to solve the problem, dear Ytliu.
I understand that solving this problem is quite difficult for you.
Making changes to hardware logic can cause many other glitches.
I certainly do not ask you to solve the problem, right now.
In such cases, you can not hurry.
It is necessary to think everything over.
You can solve this problem in six months, or a year.

The main thing is that now DDCSV, a little "crippled" or "problem" controller.
Since it does not meet the specifications of the leading manufacturer of drivers.

And the solution to this problem will immediately bring DDCSV to a whole new level of quality and reliability.
It will be possible to raise the price for it.
For example, now I would not risk, sell a lot of DDCSV, like your dealer.
Because, by reason of technical problems with the product, this business can "eat" me later.
To earn good money, i need to sell at least 40 controllers a month.
This is 500 controllers a year.
If even 10% of buyers have a hard-to-solve problem with the loss of steps, I will spare all my free time, I will spend on technical support of users.
But life is too short to waste it so stupidly :-)
I ask you to understand my position.
Have a nice weekend.

Nikolay81 · Posted at 2018-8-12 07:51:33

Mehmet Posted at 2018-8-12 00:28
Dear ytliu and nikolay
First of all. Thank you for a lot efforts for find a good solution about a pr ...

This is a good driver.
Use Falling-Low, # 416 = 2000, dividing step 1/16. And almost certainly, there will not be any loss of steps.
Although the manufacturer also indicates a minimum delay of DIR-STEP of 5 microseconds.
No additional resistors, do not put.
It is desirable to properly configure the antiresonance in the driver.

Nikolay81 · Posted at 2018-8-14 18:06:16

While Ytliu tries (or does not try) to implement the delay of DIR-STEP programmatically, I'll try to do it in hardware.
Of course, this is not an ideal option. But if you do not get it programmatically, there will be a backup option.
DDCSV is a very good controller. I believe that he has great prospects.
It's a pity that due to this flaw, it can not work with many drivers.

There are already a few options for implementing a digital delay line.
I think, within a week, it will be possible to make preliminary samples.
In any case, I will achieve the solution of this problem, since these controllers are very interesting for me.

Nikolay81 · Posted at 2018-8-14 22:25:28

ugv Posted at 2018-8-14 19:40
i can send you install files by mail if you want

Thanks for the suggestion.
But in new versions there are a lot of useful changes that make work much easier.
In addition, it is not a question of changing the value of parameter 416.
It can be changed. But at a certain value of it, there is a breakdown of the STEP signal generation. Read the article.

Nikolay81 · Posted at 2018-8-15 02:25:00

http://bbs.ddcnc.com/forum.php?m ... TA1OHw3OXw0Mw%3D%3D

Nikolay81 · Posted at 2018-8-15 15:24:06

ytliu Posted at 2018-8-15 06:25
Looking forward to your results. In addition, I have completed the logic design, the test results ...

Excuse me Ytliu.
I confess, I doubted your ability to solve the problem.
But your abilities, as always, exceed all expectations.

In any case, I will bring the digital delay line to practical implementation.
If you, for whatever reason, fail, the digital delay line will be a temporary solution to the problem.

Nikolay81 · Posted at 2018-8-17 04:45:03

Last edited by Nikolay81 In 2018-8-17 04:46 Editor

Mehmet Posted at 2018-8-17 00:47
Dear nikolay / ytliu
Please, I need your helps.I will order Leadshine HBS86H cloosed loop step drive ...

Your problem is that you think too much.
And you complicate the task too much.
You have an NC machine tool of an amateur class. Why do you need a stepper motor with an encoder?
Why such a powerful driver?
I do not know what country you are from. Maybe there you have all the millionaires and you just do not know where to spend money?
If I'm wrong and you are not a millionaire, buy cheap drivers, like DM556.
To him buy ordinary cheap stepper motors for 3 amperes.
Everything will work. I guarantee this.
Unless, of course, you do not sell defective parts :-)
If I'm not mistaken, and you're a millionaire, buy brushless servo motors.
They will be in all respects better than stepper motors with an encoder.

Nikolay81 · Posted at 2018-8-17 14:37:02

Mehmet Posted at 2018-8-17 06:28
All of machine parts are second hand ; stepper motors (nema 34 with encoder) , vfd , screws +nuts , ...

Then take any Leadshine driver with the encoder.
Lichuan drivers are copies of Leadshine. Kind of like Adidas and Abibas :-)
You can take the driver without the encoder. The motor encoder is not necessary to connect.
Everything should work if the drivers are not defective.
Do not think about it that much.

Nikolay81 · Posted at 2018-8-19 05:49:31

Biligo Posted at 2018-8-19 04:37
Dear gurus, I would like to ask for your advice. Which drivers would you recommend purchasing? Which ...

I would be in your place, I bought a normal digital drivers (your drivers are analog).
They now cost very cheaply for Aliexpress.
But if you want to "sex" with those drivers that you have, you first need to understand what part is to blame for skipping steps. Drivers, motors or mechanics.
It is necessary to disconnect the motors from the machine.
If the steps are still lost, it is advisable to get somewhere known to the serviceable motor, which does not exactly lose steps and check with it.
If this does not help, you need to understand the steps are lost when changing direction, or while moving in one direction.
To do this, you need to create special test programs.
When you give this information - I'll tell you what to do next.

Problem with delay DIR-STEP

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