More than a specific objective, it was "investing" for the future.

I just have to change the motors ... and that's it, well, I thought, well, we're going to the servos and in the future maybe I'll change the belt system to ball screws where its speed would be great and I could gain precision.

What one does not expect when, in principle, "improvement" is to encounter problems ... and when I refer to problems it is not that it takes X time to configure them, but that it may not be successful.

A greeting.

@dc42 said in Sevo motores - External controllers:

The investigation I did on this led me to conclude that the Duet 1XD expansion board I tested adequately met the published specifications provided by ClearPath.
OTOH, we know that there are some servo controllers that are designed for use with PLCCs and need drive signals much greater than 5V.
We have several OEM customers using step-servo drives with Duets.

So what do you mean, that the problem is with the servo?

And with the rest of the servos that have been talked about in the forum?

If you have customers that use servos, maybe they should be encouraged to post ... these servos work well and are configured like this.

That would encourage us fans to install them.

Thus, if in addition to the large outlay, what one sees coming are possible problems, it is difficult that there are many fans who decide to do so.

At least, in my case, I assure you that my intention was to install servos ... but if in addition to the great expense and headaches to choose them, you have to unite a sea of doubts as to whether they will work ... what I said ... I'll take them step by step.

A greeting.

@mrehorstdmd: No idea. Leadshine has the same type of servo and stepper motor.

The step by step is this:

https://leadshineindia.com/products/leadshine-integrated-stepper-ist-1706-nema-17

I don't know exactly the differences.

Anyway I am a bit dizzy with servos - hybrids - closed loops.

In the end I see that there is not a single case with servos that has not had problems. The only one I've seen that says it works correctly has been increasing the resolution by pulleys.

... I do not see it clearly.

Although I see that dc42 is a guy who knows a lot, he always says that "Most external drivers are happy with the differential signals provided by the breakout board.", I have also seen that even a technician of a brand has said that this it is like that and that really, at least in its brand, it needs them.

I have also seen this post:

https://forum.duet3d.com/topic/17780/clearpath-servos-with-1xd-expansion/37?_=1597066436587

It gives the impression that the Duets are not very fine with external drivers and more specifically with servos due to a problem with the electronics itself.

I say this because I have seen that the same servos that have been mentioned here are working on CNC machines, also at a lower speed, with good precision and without any problem.

So, I don't want trouble: I have looked for a few Oriental Motors step by step and will make the switch to them.

A greeting.

I am not an expert.
I'm just an amateur.
I don't mind fighting and trying ... but up to a point.
I have never used servos: I have had a CNC Rotuer and currently I have a mini CNC mill, and both with stepper motors.
Now I would like to make the leap to servos ... but I see that you can even have more difficulty in 3D printing than in a CNC?

I had planned to use these Servos with embedded controller:

http://leadshineusa.com/UploadFile/Down/IES-1706d10.pdf

Do you think they will suit me?

Thank you.

I think it is a very interesting topic, and, from what I have searched, in no thread has a good final result been reached.
For that reason, I open a new post, to see if with your help I can come to fruition.

https://forum.duet3d.com/topic/17535/solved-leadshine-closed-loop-external-motor-drivers-with-duet2

Thanks.

I think it is a very interesting topic, so I open a thread, see if we can get something clear.

https://forum.duet3d.com/topic/17535/solved-leadshine-closed-loop-external-motor-drivers-with-duet2

Thanks you.

Hi all.
I want to "upgrade" a BLV MGN Cube and add a third motor to the Z axis for self-leveling. I will also take advantage and change the spindles that it mounts for ball screws.
Since I have to change motors, I would like to make a change for the better (more precision, if possible and more speed).
I have searched for all the information I could about using external controllers, particularly for connecting servo motors.
I have found only one case in the forum where the use of external drivers with stepper motors seems to have worked for it.
The question is, do you know of use cases of external controllers with servo motors that work well?
One of the problems when connecting external drivers (particularly with servo motors) is that the differential signals on the expansion board are 3.3 V.
dc42, says many times:
"Most external drivers are happy with the differential signals provided by the breakout board. However if your drivers really do need 5V then you can achieve this by connecting PUL +, DIR + and ENA + from the external driver to + 5V on one of the heater / servo connectors on the breakout board, instead of to the + pins on the 6-pin output connector ".
Ok, it seems, those are most of the time, but it seems that there are cases (especially in servo motors) in which not.
That has been clear to me, but let's go to the assumption in which they are necessary:
f I use 5 external motors that need the 5V differential signal, do I connect the PUl +, DIR + and ENA + of the 5 motors to the 5V of one of the heaters?
That is, the 3 positive pins of each motor x 5 motors, do I connect the 15 to the 5V of one of the heaters?
And how will the board know which motor it corresponds to?
One of the posts where there is more information is this:
https://forum.duet3d.com/topic/17970/configuring-for-servomotors?_=1597447796699
... but in the end, the bottom line is that for whatever reason, the servos you use are not suitable for use in 3D printing.
For all that said, if someone has servo motors running on a 3D printer and could contribute their expertise, that would be great.
A greeting.

Thank you very much for your answer.
The other question:
Do you think the problem is with these particular servos or with the servo motors themselves with the Duet?
I mean, would you try other servos?
I have seen some similar Leadshine, the IES-1706, with the great difference of the confidence that this brand gives ... but I do not find much information about them either.
Thank you.

@dc42 said in [Duet expansion breakout board not

3. Most external drivers are happy with the differential signals provided by the breakout board. However if your drivers really do need 5V then you can achieve this by connecting PUL+, DIR+ and ENA+ from the external driver to +5V on one of the heater/servo connectors on the breakout board, instead of to the + pins on the 6-pin output connector.

Hi.
I have already read this comment in several posts.
My question: There are 5 channels of drivers.
If I use 5 external motors that need the 5V differential signal, do I connect the PUl +, DIR + and ENA + of the 5 motors to the 5V of one of the heaters?
That is, the 3 positive pins of each motor x 5 motors, do I connect the 15 to the 5V of one of the heaters?
And how will the board know which motor it corresponds to?
Thank you.

Hi.
I am about to buy IHSV servos for a CoreXY 3d printer.
First of all, thank you very much for sharing the information: Without it I would not have dared to take the step.
Some doubts arise:

• The microsteps, although they are not set in the Duet configuration, do they work directly on the servos?
• You say you bought the Duet expansion board and connected directly and did it work? I ask this because the differential of the expansion board is 3.6V and that for 5V you have to bridge the 5V of the servo connectors on the board ... and the Servo manual says that it is compatible from 5 to 24V.
  Anything else you think I should know about?
  To this day, after having tried it, do you consider it a good option? Would you also do it on the 3D printer?
  Thank you