Yes, that's the manual. It's confusing because the drive supports both V/f control AND vector control.
In vector control, the max voltage (and other parameters) are set in this table:
Note that you only have to input parameters 0-4. Parameters 5-9 are automatically calculated when it performs the dynamic auto-tuning.
I looked through the manual, and couldn't immediately find a way to set the frequency differently if V/f mode was desired, though.