[rai]

I am looking for a servo drive to control a position of valve or cam (0 to 270 deg. movement) by analog command 0-10Vdc or 4-20ma. kindly suggest me a suitable and low cost servo drive.

[Al_The_Man]

I have used A-M-C products, also I made up a solenoid controller for a hydraulic servo valve from a single IC that worked well, +-10vdc, National LM759 with a few resistors and caps.
What are you using for the 0-10v command?
Al.

[rai]

Thank you very much for your reply. Actually I want to make a fully servo controlled position control valve using servo motor, earlier I was using electro pneumatic position control valve like ABB, siemens make controlled by analog 4-20ma from PID controller, as pneumatic devices are very senstive to mositure, it gets damage very soon. could send me the details of your solenoid controller that you made? it might be useful for my application.

I have used A-M-C products, also I made up a solenoid controller for a hydraulic servo valve from a single IC that worked well, +-10vdc, National LM759 with a few resistors and caps.
What are you using for the 0-10v command?
Al.

[Al_The_Man]

This is the link, see p10 for the DC motor control, I fed the analogue out from a motion card and used an encoder back to the card for control, it worked well with a hyd servo valve.
http://www.national.com/ds/LM/LM759.pdf
Al.