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Yes it is possible, you need to use a usb to rs232 converter, in classicladder there is a setting to choose the usb port on the PC and then just choose the type of data you are going to send and the correct addressing

Is there some way you could replace the 0..10V feedback device with
either an incremental or absolute (say BISS or SSI) linear encoder?
(an incremental encoder would need homing)

That would simplify things a bit

If you needed to use the 0..10V feedback you could add a 7I87
(which is overkill since it has 6 channels of +- 10V input)

Another possibility is to use the 7I77 analog inputs but they are
very crude and would only give about 1% resolution steps

Very good, congratulations on the initiative.
I am developing a G code generator in Python that transforms DXF files for a punch press. It is not being easy, there is a lack of professionals in the market for such a challenge.

This drive works by pulse or analog, you need to use communication software to configure how it will work, it has a connector with several functionalities. Can you provide more information on what type of machine and what situation you are using this servo drive for?

Hey guys
I'm retrofitting a Nisshinbo hiq-1250 punching machine.

The machine has a hydraulic cylinder on the Z axis that descends when applying -10 volts and rises when applying +10 volts. The feedback for this movement is made with a magnetic sensor that has an output of 0 to +10V, showing the height position of the piston that hits the punch. The force of the beat is controlled by a proportional valve that works with a voltage of 0 to 24V.
This axis must have descent control which, depending on the power and strength, can drill, cut and press the metal sheet.
The machine already has the movements of the X Y and T axes (tool change) using the 7i96s and 7i84d boards.
I'm waiting for the 7I77 board to arrive, which has an analog output to control the hydraulic cylinder.
How do I configure the Z axis to be an analog output of -10V and + 10V with sensor feedback 0 to +10V?
Any example, no matter how simple, helps, I need an example of how this is done, or possible theories
Thanks to anyone who can help me.

 

@RDA,

Okey. Served to you a 9 axis jog while paused planner.

Now i thought, maybe first resume the xy to the path and as last the z and other axis abcuvw.

The result is stunning, I feel like a type goat to do it for 9 axis.

There's nothing wrong with using one of those little step down converters from Amazon just to power a Mesa card. I had pins soldered to one that went straight into the screw terminal connector of a 7i96, probably going on 3 years now supplied from the same 24v power supply.

Make sure you get one that you can solder a pad to fix the output voltage to 5v, those little trimmer pots are horrible.

Grotius wrote:

So i could do this for 9 axis. Who thinks this is a thing you should have or not have?

Yes please

@Robh,

i can fully understand this and the hours in debug and checking etc. it all does add up. and why my self and many others are hoping you can get to the end goal.
I have learned to supply yourself some kind off fallback for every c or c++ lib you write. For example
the grotius scurve engine is a quite complicated code. To test changes i have a test suite. Without this,
everything becomes way more difficult.

 

Off course i hope to reach the end goal for us all.

you need to open up a beer tab for us to tip into!
Yeahh.

i my self have done many builds over the years on linuxcnc,
its all big iron stuff converted, with new AC servos etc etc.
machiens are 3+4 axis mills, 5 axis mill,
to lathes with single and twin turrets, from small 42mm spindle bore to 600mm swing over the bed.
So very experienced !!

what would be intresting is to see what the difference is on a tool path like trochoidal milling or surfacing , looks promasising in the 2D already.
The advantage for trochoidal milling should be in the scurved velocity profile doesn't it?

Take a look at the cavaliercontours c++ lib on github. When the look ahead works, i will code a sample for this.
This lib can provide us with nice toolpath's. The procedure is as follows:

1. Input the ammount of "n" look ahead lines into the cavaliercontours lib.
2. Offset the open contour to one side with a offset value, given 0.01mm
3. Offset the the offsetted contour back onto the original path. The result is a contour with arc shaped corners.

many thanks for taking on such a task and getting so far along with it.
I had paused the project for a while. But i hope to finish it coming time.

@Robh,

Will reply on your input in next post.

I had some problems today with coding. The scurve trajectory planner was sometimes missing the target position.
So this is now solved, but it taked a lot off time to investegate.
With solving that i lost a part look ahead code. So tomorrow i will take a new start.

Tonight i added the motion reverse. This was done in short time.
Then i thought, hey why not try :
-- jogging while in pause --

So i coded a jog in pause, for the x axis plus button, just to test it out.

The video jog in pause :


So i could do this for 9 axis. Who thinks this is a thing you should have or not have?

Snap-on or toroid type should be about the same
Snap-on's have the advantage that they are better if
you have larger connectors so don't need such huge
toroids if you don't want to remove connectors.

Its usually better to pass all 3 UVW through one larger core
as this allows larger inductance (higher permeability) without
saturating. (since the net U,V,W current is 0, only the unbalanced
currents to ground that cause the issues are filtered)
 

Not yet. What do you recommend on the common mode choke for the encoder? Snap on filter and pass through or wrap around?
AMC also suggest suppression core in one of their docs for the motor leads at 2-5 turns for each phase. If my rings are too small to fit all leads, can I use one ferrite per phase or do all leads have to pass through one?

 

turns out it was EMI all along. rewired it and its not all gone but its way better and good enough.

@Grotius
i can fully understand this and the hours in debug and checking etc. it all does add up. and why my self and many others are hoping you can get to the end goal.
you need to open up a beer tab for us to tip into!

i my self have done many builds over the years on linuxcnc,
its all big iron stuff converted, with new AC servos etc etc.
machiens are 3+4 axis mills, 5 axis mill,
to lathes with single and twin turrets, from small 42mm spindle bore to 600mm swing over the bed.


what would be intresting is to see what the difference is on a tool path like trochoidal milling or surfacing , looks promasising in the 2D already.

many thanks for taking on such a task and getting so far along with it.