Setting VFD Acceleration

Description of the problem:

I'm trying to set up acceleration on my Mitsubishi VFD.
Acceleration on a Mitsubishi VFD is controlled by three parameters: 
Pr. 7 - Acceleration Time
Pr. 13 - Starting Frequency
Pr. 20 - Acceleration/Deceleration Reference Frequency
[Pr. 7] = [Pr. 20]/[Maximum operating frequency - Pr. 13]*[Total time from stop to maximum operating frequency]
See p. 96 of the FR-D700 manual for more detail.