Hi Stuart, OUCH! Those sound like a larger version of the Fijitsu-Fanuc amps I pulled off the Mazak. Rather slow by todays standards and not PWM so more heat. If that is really 33 amps average and not peak then those are big amps. I used Servo Dynamics 1525's on the Mazak but then they only have to move a couple thou Kg. These SD's were also used in the Mazak conversion at Galesburg (Cardinal Engineering) ... see emc wiki. They are 15 amps average and 25 A peak but will go up to 165 V which provides a lot of power if one dares drive their servo's with that kind of voltage. The SD's roll off at about 2KHz, a bit faster than 3 phase SCR's. ;-) I don't think SD makes anything larger in a non-custom amp. You might ask tho.
http://www.servodynamics.com/ If you are really brave you can always redesign the front end of the Getty's with modern op-amps. You will still be stuck with the old freq. response what ever you do. I hope someone else has better and cheaper ideas. HTH Dave On Apr 5, 2008, at 2:28 PM, Stuart Stevenson wrote: > Gentlemen, > The servo amps on my cinci are GETTYS Model N350/N135 33 amp. > These each have a few edge connected boards inserted on them for > different functions. > These are OLD analog boards. I am sure each component board could > use a good tuning. As this is not feasible (AFAIK), I am researching > how to remove the analog boards. I want to dumb down the amplifier and > use the tuning in EMC to control everything. > These have some heavy duty SCR's and heat sinks. Can anyone direct > me to documentation or a project I could use to modify these amps? > Stripping the board and using discrete components is an option. > Throwing them away and purchasing new amps is possible but I like > the idea of reusing some of the components. > Nothing is off the table. > Suggestions, comments welcome. > Of course, I am looking for cheaper - faster - better. :) > thanks > Stuart > > ---------------------------------------------------------------------- > --- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Register now and save $200. Hurry, offer ends at 11:59 p.m., > Monday, April 7! Use priority code J8TLD2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http:// > java.sun.com/javaone > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
