You get a salary that can be paid from the grants, but if you get $1m or $20M in grants it's not going to be a change in your salary. At least until you negotia

You get a salary that can be paid from the grants, but if you get $1m or $20M in grants it's not going to be a change in your salary. At least until you negotiate a higher salary. And if you don't get the grants in the next cycle, the university will be paying your salary.