[=aike=]

Hi!
I use Fanuc15M with C-series servo drivers in horizontal HITACHI HG400.
My Y drive (A06B-6066-H008) very often switched off due current overload.
I checked the monitor. The load is 60% when the Y moving up (rise) and 20%
when the Y moving down (dive).
When the Y axes stop in any position in any height, the load is 60% anyway.
Looks like the PID system try to decrease following error to 0, but wihout luck. The current has to be about 30%, when the Y stop.
That is why after several working hours the Y axes fault.
I want to change the C-series to Alfa series.
In other HITACH HG400 but with SEIKOS CNC, I use alfa series.
Can anybody help me. How to change C th alfa?
Is it possible? What signals to use? Is there any manuals or documents how to do it?

[tc429]

not sure on the 15, but think youll need updated servo rom if you want to update, think zero series require 9049 for alphas, think most C series had like 9040/9046... reconfiguring a 15A can be quite a challenge... its a awesome controller, but in my opinion is the toughest Fanuc to configure- expect to be on the phone a lot


weve got a couple old machines that need refitted (but still run good parts) to keep them limping along, at end of cycle I put a g30 false home -.01 from home (after going home/before m30) to unload the servo...not right, but its ran that way a year so far.
are you sure the counterbalance pressure and thrust bearings are ok? sounds like the counterbalance is light(in our case its small machines that run without counterweight, always pulls hard up)


if you think the servo just isnt pulling hard enough, i'd try bumping up the load inertia and see if it helps a little- that parameter seems to me to be the most 'like the old gain pot on a analog drive', usually my first place to try to tweak... careful though, too much can squeal/blow a drive...

are you certain your slide/screw lube is keeping everything oiled?

thats about my 2 cents worth of questions/comments

[=aike=]

Hi!
Thank you for your advice!
Looks like you are right. I check the power consumtion, if the axes Y moving in up, the power is about 55%, if the axes stop moving the power consumption is 45% but if I moving axes down (dive) to 0.1mm, the power consumption decreas to 35%.
I will try to rewrite programs to make all finish moving to down, to unload the servo.
On monday - wednesday will be the final conclusion.