Problem with delay DIR-STEP

Biligo · Posted at 2018-8-19 04:37:02

Dear gurus, I would like to ask for your advice. Which drivers would you recommend purchasing? Which ones will work properly without any extra dance with tambourines. I have some sort of noname 4A drivers on the TB6600 chip (you can find lots of those on eBay for £5-6) but I still cannot make those drivers work without skipping steps. Does anyone have experience in working with DM542 drivers? Please share your knowledge.

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.

Biligo · Posted at 2018-8-19 09:14:58

Nikolay81 Posted at 2018-8-19 05:49
I would be in your place, I bought a normal digital drivers (your drivers are analog).
They now co ...

Thank you for your willingness to help Nikolay. I found a post on this forum, where Alessio uploaded pictures of that driver and said that he couldn't start it at all. Thereby, I really do not feel like having "sex" with them

I would like to hear people's recommendations on which drivers work the best with the controller DDCSV2.1

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.

ytliu · Posted at 2018-8-20 09:13:33

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 ...

The tb6600 driver can be used with confidence, and we have a lot of users using it. If lost steps occurs during processing, change the pulse level polarity in ddcsv.

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?

ytliu · Posted at 2018-9-2 07:53:58

Thank you for your excellent work. I saw the schematic and I think it has no defects. This circuit should be very good at solving the problem of losing steps.
DDCSV has built-in FPGA, I added delay logic on FPGA, it has been tested for a while, and it works well so far.

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?

ytliu · Posted at 2018-9-4 06:23:03

Nikolay81 Posted at 2018-9-2 17:26
And how can "ordinary people" benefit from the results of your work?
Will it be possible, through ...

Your idea is correct, users can't update fpga themselves.

Problem with delay DIR-STEP

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