The Fuji FRN020F1S-4DY is a FRENIC-Eco Pump drive, purpose-built for pump and fan loads in HVAC, water, and industrial process applications. It's rated 20 HP at 460 V three-phase, so it handles a 15 kW motor on a standard 480 V distribution system without derating for voltage.
The 20 HP rating at 460 V three-phase is the continuous motor output the drive can deliver. For a pump or fan load, the variable-torque curve means you can run it up to that full rating without oversizing — the drive's overload capacity (typically 110% for 60 s on pump profiles) handles start-up and surge conditions common to centrifugal loads.