How to use analog servo drive with not 10V analog input
10 Nov 2018 20:10 #120415
by aleksamc
How to use analog servo drive with not 10V analog input was created by aleksamc
I want to restore old CNC machine with DC servodrives that has not 10V analog input but 7V.
I think that for such drives perfect will be 7i77 board but it has 10V output. What should I do? Can I configure in linuxcnc maximum output for 7V or it's beter to use operational amplifier to change voltage? As my experiance shows - less devices = more reliable.
Or there is other boards for 7V are present?
I think that for such drives perfect will be 7i77 board but it has 10V output. What should I do? Can I configure in linuxcnc maximum output for 7V or it's beter to use operational amplifier to change voltage? As my experiance shows - less devices = more reliable.
Or there is other boards for 7V are present?
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10 Nov 2018 21:34 #120419
by PCW
Replied by PCW on topic How to use analog servo drive with not 10V analog input
I would just bound the output with the max_lim and min lim parameters
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10 Nov 2018 22:30 #120423
by tommylight
Replied by tommylight on topic How to use analog servo drive with not 10V analog input
That might be the absolute maximum rating for a PWM input, i do not think it is +-7V. Does the drive have a dir pin?
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11 Nov 2018 00:03 #120431
by PCW
Replied by PCW on topic How to use analog servo drive with not 10V analog input
Didn't think about that, it could be a maximum for a TTL of RS-422 type input
Do you have the drive manual or listing of the controller connection pins?
Do you have the drive manual or listing of the controller connection pins?
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11 Nov 2018 05:01 #120436
by aleksamc
Replied by aleksamc on topic How to use analog servo drive with not 10V analog input
Yes I have drive manual.
Drive doesn't have dir pin. It controls with standart +/- control voltage.
Question is only in 7 volts.
If I reduce maximum and minimum voltage everything will be OK. It's very good.
Drive doesn't have dir pin. It controls with standart +/- control voltage.
Question is only in 7 volts.
If I reduce maximum and minimum voltage everything will be OK. It's very good.
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