Problem with delay DIR-STEP

Nikolay81 · Posted at 2018-8-19 17:41:25

Biligo Posted at 2018-8-19 09:14
Thank you for your willingness to help Nikolay. I found a post on this forum, where Alessio upload ...

I know people who have a machine running these drivers.
And it works well. But the controller there is not DDCSV.
By the way, I was mistaken. These drivers are digital. But they do not have a connector for tuning through a computer.
But if there is a great desire, you can get everything to work.
You can try to conduct the last experiment, before they throw it away.
Step division 1/8. # 416 = 7000. There are two jumpers inside the driver, J1 and J3. J1 must be opened and J3 closed.
Parameters # 418- # 421 = LOW.
Disconnect the motors from the machine, put the disks on their shafts. The diameter of the disks is equal to the diameter of the motor housing. Disks can be made from anything.
For example, from plywood or plastic. On the disks and on the body you draw serifs. On them you will determine if the motor loses its steps.
Speed is not more than 5000 mm / min.
And you try to run test programs.
Based on the results, sign off.

Nikolay81 · Posted at 2018-8-20 23:18:35

ytliu Posted at 2018-8-20 09:13
The tb6600 driver can be used with confidence, and we have a lot of users using it. If lost steps ...

He does not have original drivers (noName).
With such products, anything can happen.
So, first you need to try the "ideal" settings and exclude the wedging of the ball screw.
If this does not help, you need to buy new drivers.

Nikolay81 · Posted at 2018-9-2 01:28:48

ytliu Posted at 2018-8-20 09:13
The tb6600 driver can be used with confidence, and we have a lot of users using it. If lost steps ...

Sorry for the wait, Ytliu.
I was sick for a while. And the task was not as simple as I thought.
To make an effective digital delay line, it was possible on the shift registers.
I managed to implement 2 versions of the device: on microcircuits MC14557 (need 4 pieces) and 74HC7731 or 74HCT7731 (1 piece is needed).
The delay value is controlled by switches. The device is very small, low-cost, consumes little power, does not heat up and is easily placed inside the DDCSV housing (instead of 100m output resistors).
I post the schematic for MC14557. Because 74HC7731 is a rare chip. I have not received it yet. The circuit on 74HC7731 will be later.
The device is tested in operation and with an oscilloscope. It does not spoil the quality of the output signal. Loss of steps there.

Please rate the scheme, Ytliu. I value your change as a professional. Maybe I did not take something into account?

Nikolay81 · Posted at 2018-9-2 17:26:22

ytliu Posted at 2018-9-2 07:53
Thank you for your excellent work. I saw the schematic and I think it has no defects. This circuit s ...

And how can "ordinary people" benefit from the results of your work?
Will it be possible, through the usual firmware, or Cyclone III, to be flashed separately?

Nikolay81 · Posted at 2018-9-4 14:47:37

ytliu Posted at 2018-9-4 06:23
Your idea is correct, users can't update fpga themselves.

Excuse my incomprehensibility. I correctly understood that now all DDCSV will be produced with a new firmware FPGA? And in them, parameter # 416 can be set to any number up to 10000 ns?

Nikolay81 · Posted at 2018-9-5 03:21:55

ytliu Posted at 2018-9-4 21:44
Users cannot update the fpga firmware themselves.
After the detailed test is completed, we will up ...

Thank you very much for your work, Ytliu.
I think the problem can be considered solved.
I hope soon all DDCSV will be sold with a new firmware Cyclone III.

Those who have already bought DDCSV and can not solve the problem of skipping steps when changing directions with settings, you need to collect a simple digital delay line scheme.
This solves the problem in all cases.

Nikolay81 · Posted at 2018-10-1 18:02:55

I post, very simple and cheap scheme of the digital signal delay line. This is a very good and reliable option, but the main chip is difficult to buy. She was removed from production.

Problem with delay DIR-STEP

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