On Tue, 24 Nov 2020 at 20:25, John Figie <zephyr9...@gmail.com> wrote:
> I am thinking that I want to use Mesa Etherent I/O cards and I want to use > PID servo control. > > About the motors: These are Peerless DC motors (8 brushes). 66V max and > 3.75 Amps Max. 800 RPM coupled directly to the ball screws with a servo > coupling. Mesa have a suitable dual-motor servo drive, the 7i40HV: http://store.mesanet.com/index.php?route=product/product&path=83_90&product_id=147 That pretty-much puts you in the 50-pin-header section of the Mesa catalogue, so as the main FPGA card your choices (using Ethernet) are 7i93 (headers for two cards) or 7i80HD (headers for 3 cards, and available with two different FPGA sizes) http://store.mesanet.com/index.php?route=product/product&path=83_85&product_id=341 http://store.mesanet.com/index.php?route=product/product&path=83_85&product_id=62 The 7i40 includes an interface for incremental encoders, so you would probably just need to choose a generic IO board such as the 7i37TA to complete the system. (Or you could go with a 7i44 and a bunch of smart-serial peripherals) The 7i40 manual is not linked from the product page (something of an oversight, PCW) but is here: http://www.mesanet.com/pdf/motion/7i40man.pdf The 7i40 will work with any firmware with "SV" in the bitfile name, so despite the fact that it is not mentioned in the 7i40 manual, the 7i80HD with the 7i80hd_16_sv12 would be able to drive up to 12 motors via 6x7i40 cards. In practice you would "turn off" the other potential "SV" sections to use the pins as GPIO for the other cards. It looks like you can probably use the 7i80HD-16 unless you need to use a 7i49 card to read resolvers. Which begs the question, what was the feedback method used when the lathe was new? Similarly the 7i93 appears to have SV and SVRM (servo/resolver) bitfiles available so should work. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
