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by nölen
General questions about siemens servo drives was created by
nölen
Hello everyone!
I m new to linuxcnc.
I m trying to drive 3-phase AC brushless servos made by Siemens using their own drives. Can someone help me determine if these drives can be used with linuxcnc? Some advice on how to do it would be much appreciated too!
The drives are:
Sinamics s110 (The Profibus version)
with a Sinamics cu305 on top.
4Nm Brushles motor.
I saw that i can use them with step/direction signals. I didn't find anything about +/-10V Signals.
Would it be better to control them over profibus?
Generally, can they be used for a good machine?
Thanks in advance!
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by dberndt
Replied by
dberndt on topic General questions about siemens servo drives
I don't see why not? It seems the cu305 has an analog in on the x132 connector that could be used. I know next to nothing about the sinamics stuff, but a careful review of the documents should have you on your way.
I'd lean towards using the +/- 10v input over step+direction, but both can get the job done.
I don't see an encoder output of the cu305. So maybe consider that, if you choose something where you have to get encoder signals back to linuxcnc, how you will do that? Typically many drives will "repeat" the encoder inputs they receive out another port, which you can just wire up easily to a 7i77 or similar, guessing that won't be the case with the cu305, depending on your encoder type this could be an easy problem to solve, or a hard problem...This would be where letting the existing control close the loop and just doing step+dir input might be easier, no encoder feedback to lcnc necessary.
I'm not aware of any realtime profibus linuxcnc hal components. There appears to be a userspace component, but you really can't use that for anything like realtime axis positioning. I'd encourage you to do some googling and reading to see if any hardware/software exists to utilize profibus.
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by pl7i92
Replied by
pl7i92 on topic General questions about siemens servo drives
this is best to go for the MESA 7i77
if you need Ethernet get a 7i92 bevor the moduele and the mashine go like Hell
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by nölen
Replied by
nölen on topic General questions about siemens servo drives
Well i already have exactly those components (for free ). 4 Modules with 4 Nm motors.
The motors have built in rotary encoders wich are connected via Drive cliq to the controller.
If i drive them with step/direction, they should control the position itself. (?)
I might have to set up the controller loop.
What do you think? What is the best way to drive the system:
-Wire/ redirect the encoder to linuxcnc and operate the controller in open-loop.
-Wire/ redirect the encoder to linuxcnc and operate the controller in closed-loop. (Redundance?)
- Operate the controller in closed-loop and drive it with step/direction signals.
- Other suggestions?
Last but not least, what do you think about the controller and motor? Is that enough to cut aluminium with a 1:2 belt ratio? Or in general, can i achieve a good cnc milling machine with that system?
Its my first build that size. I got a lot of parts for free and i'm trying to get the best solution out of it.
Thank you in advance!
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by dberndt
Replied by
dberndt on topic General questions about siemens servo drives
Ignoring the encoder and open/closed loop questions for now.
4nm servos are reasonably big depending on your end goal, But the full system has to be considered. What is the pitch of your ballscrew? Will you use a gearbox? What milling machine are they going on? Does the table, weigh a 10lbs, a couple hundred lbs? Is you're Z axis counter balanced? Do you have/need a Z axis brake? What speed and acceleration do you desire from the machine? Is it box way? dovetail way? or linear slides?
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by pl7i92
Replied by
pl7i92 on topic General questions about siemens servo drives
For aluminum it is well ok at 4Nm
with a 20/25 Timingbelt 16mm or more on a Ballscrew fits your need
i make parts on a trapezonal low cost with a 35Euro Bosch spindle that workes
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