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

what a pine do you talk, cn2 it's tacho with temperature sensor,, i have 7192/ 7i77d (siniking), the spindle drive have 0 to +10v need pin to reverse i will dig this wk-end For Cn-1 pin 18 its os, i think it's a word, i will check my electrical diagram but not all info in there. and the manual i pick it with a lathe it s 6t model b not a, the turret it's hydraulic ,its is old pulse coder 6 position with index in midle stoke of each position , i will check for new, abz (360,600 or other , need to index(homing) want wake it up and generate a pulse in middle on tool position and split 360 in 6 for 60 degree to check parity (slow down the turret and whent hit the synthetique pulse, stop in place and clamp) do you have suggest for adapteur brand 6mm encoder shaft to 10mm on the machine ?! tkx Tom

i think 400 it's 0v

437,512 and 546 it's for run , forward and reverse , 3 magentic contactor (run give the power, and after f or r its activing not 2 in same time ,

i will confirm that

Maybe the bldc component could have a velocity output pin for synthesising a tach signal.

Do the drives work in torque mode if the tach signal input is shorted to zero? I would rather expect them to either do that, or to fault out.

Basically the output is the difference between commanded velocity and tach velocity. So if the tach is zero you just have a current / torque mode drive.

Anyway, I don't think V/F analogue hardware is the way to go, it can be worked out in HAL and generated with a D-to-A converter (maybe even a spare analogue output on the control board...)

andypugh wrote:

Anyway, I don't think V/F analogue hardware is the way to go, it can be worked out in HAL and generated with a D-to-A converter (maybe even a spare analogue output on the control board...)

This only makes sense if the drives absolutely need a tach signal. If they don't then it makes no sense to synthesise a tach and sum the voltages in the drive. At that point move the velocity loop in to HAL and reduce the analogue output once at-speed (or in-position) 

 

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

You can get the velocity either from the encoder counter (these have velocity output pins) or possibly running ddt on the bldc.0.rotor-angle.
But the encoder-velocity will be better.