Dc servo motor control

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23 Mar 2022 01:16 #238064 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
Haha yes I should have looked more it would have saves time! now I have both the servo enable and the servo drive dc voltage contactor working, I spent a long time looking for the pins for the contactor, but it was just simply 2 pins on the large x1 terminal strip, 23 and 25 I think. Then the servo enable was pin3 on the x4 connector on the servo power supply board, but yes both would be easier to function from the computer cabinet.

hopefully will have boards soon to start installing.

Then my first ever time to use linux.....
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04 Apr 2022 23:32 #239288 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
I now have the machine moving X+Y and all encoders working!
Servo tuning next.

Thanks RodW for all the help! 
Also to Tommylight for his previous posts and advice
Esaber for the esab schematic upload
gnipsel.com was also useful for encoder help.

Still a good way to go yet
I bought a 176a with EM-1A electromen dc motor controller for z axis and mounted and encoder, the encoder works however the motor controller is no good, I have no signal ground for analogue control. there is signal input, -5v and +5v.. looks like I will have to get something else
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04 Apr 2022 23:40 #239289 by tommylight
Replied by tommylight on topic Dc servo motor control
Pictures of the drive ?
Is the analog input +-5V ?
Signal ground can be dealt with, Mesa 7i77 can be set in hal to output +-5V, so should be doable.

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05 Apr 2022 00:19 #239294 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
electromen.com/files/3816/1129/6638/EN_em-176A.pdf

I have the bipolar chip installed,

It can take -10 > +10 signal, I just have no signal gnd, the 0v is for motor power gnd. 

could I use a diode?

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05 Apr 2022 00:28 #239295 by tommylight
Replied by tommylight on topic Dc servo motor control
It will do just fine, just add an isolated power supply for it, and make sure the 0V on that power supply is not grounded.
New power supplies are mostly not grounded on the output, older ones were always grounded to 0V.
Even this can be fixed by opening the power supply and isolating 0V from ground.
Put it as close to the drive as you can and use short wires.
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05 Apr 2022 05:43 #239301 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
Ok, providing the power supply is not grounded I use pin 4 gnd 0v on the motor controller to connect my isolated power supply 0v and my signal 0v from the mesa on the same pin?

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05 Apr 2022 10:57 #239315 by tommylight
Replied by tommylight on topic Dc servo motor control
Yes, the analog gnd to 0V on the drive pin4 i think.
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05 Apr 2022 12:21 #239325 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
Thanks, il give that a go. I was set to start servo tuning, I had the single servo enable from the esab just done through an estop however i have now wired it through a ss relay to one of the 7i77 outputs, I selected "machine is enabled" in the pnc config, it works ok in halshow using the sets command 0/1 but has no functionality in the qtplasmac interface, do i need to wire each sevo enable individually?

Also I can check the y tandem encoder in halshow however I dont know how to test motor direction,  I could test all the other motors direction and encoders in pncconfig but it does not have a setting screen for y tandem

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05 Apr 2022 12:36 - 05 Apr 2022 13:28 #239327 by Joeymcc
Replied by Joeymcc on topic Dc servo motor control
Sorry this was an accidental double post
Last edit: 05 Apr 2022 13:28 by Joeymcc.

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05 Apr 2022 15:10 #239341 by tommylight
Replied by tommylight on topic Dc servo motor control
All enables can be on one wire, that is how they are in the original control, so there is no use in having them separate.
For encoder and direction and tuning, use the "calibration" from the "machine" menu. For changing direction a simple - in front of the encoder or output value is required.
But first, make sure the encoders are counting in the right direction, look at the DRO on screen, the counts should go up when machine goes to the right for X axis and away from you on the Y axis.

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