I have a robodrill t14ia with 16iM control.

the label on the control cab says 9kva. that being said, the spindle drive says max input is about 30kva.

the spindle is very aggressive in current draw on acceleration. I get alarm 05 dc bus low alarms when trying to accel above 6krpm. its a 12k spindle.

I tried changing the params 4083 (accel time), 4202 current limit strategy, 4203 current limit value. these settings seemed to have no effect at all.

i tried settings 4083 from 10 to 200, no effect, setting of 500 made alarms
i tried 4202, 1 (default is 0). my understanding is that this would limit the current only on acceleration, but i dont know this for sure. i believe 1 is on accel only, 2 is on full speed only, 3 is accel and full speed?
i tried 4203, 100, 80, 40, 10, 1 (default is 0), settings above 100 made alarms

i have all the fanuc manuals and i rtfm (i think?!). anyone out there have experience with this era of fanuc drive and params to where you know how to get the machine to slow down the acceleration slightly?

thanks.