R-30iB - global speed limit

I assume you don't want to just set a lower speed override percentage?

Do you have a copy of the controller software reference manual? If not, here's a couple of variables that might do what you need. Not sure though.

globally affect overall speeds with $MCR_GRP[1].$PRGOVERRIDE. It can be set in programs to only affect programmed speed, such as running at 75%, while the General Override is showing 100%. It is 'multiplied' by General Override for each programmed motion, so a $MCR_GRP[1].$PRGOVERRIDE value of 50 would yield half-speed if General Override is 100% or quarter-speed if General Override is set to 50%.