retrofit ikegai fx20n 6t, probleme nec drive sur hitachi seiki

for the ikegai spindle drive ,i have feedback from the tacho motor ( 3 phase voltage comme back in the drive don't need to figure what happend in the drive spindle(not now), fanuc  velocity unit control drive a06b-6045-h001/h002 need synthetic feedback i dont have tacho ,  yes i will use pmw output (analog on 7i77 ) 0,1 for vcmd  and 2.3 for feedback, 4 empty and five for spindle.
synthetic encoder (F/V)  need to output 6v by 1000 rpm,  but smaller and older motor some control need 3v or 3.5 volt feed back for 1000 rpm , ( the drive for fanuc motor  model 0 and model 5  x,z only velocity mode . i found a timing to turn ON properly the fanuc drive, sorry Andy i will dont try your bypass,  i think i will be oki with 1980 velocity amplifier  do you use line (ppr or count for synthetic  feedback) ex 2000 ppr or 8000 counts?! i will check if i found it, sure the fpga can do the job i think ppr its oki
TKX Andy 


Pat

Hi Andy, yes i have velocity-fb and rpm-fb  enco 00 and01 i will try to use drv 02 and 03 for create synthetic dac but need 6v at 1000rpm , the ball screw its 10 mm  with 55 thts and motor have 22 teth encoder 2000 ppr  max rpm 2000 rpm but i think need to modify the scale for adjustement, i need to make some search in the fanuc book , found what  voltage have(how can found it on the drive), but now the mdi and automatic mode on the machine it's dead, i will check if my cycle start button it's dead or the control , now it's little bit more hard, i make cable to check the data on my spindle drive, i will try to command the spindle with  1.5 v batterie, i will go dissambly the cover , need acces to chuck side it's pressure switch or another thing,  spindle have resistance break and brake disk, for the fb  velocity it's reel speed output (inches /sec)  and rpm  (rpm motor)  the encoder in ppr.( i need to make sure im in the rigth  units  for speed and rpm) i think rpm its angular speed  second?! or tour seconde or minute, for little make a big diff i have no idea how check velocity feed back volt in running situation (hardware test)
tkx again ,   i will output rpm and set the value for one rpm/min , just play to set frequency match or set it directly tkx again

Pat