The FRN700F1S-4U is a Fuji FRENIC-ECO (F1) variable frequency drive rated for 700 HP on a 3-phase 460 VAC supply. This is a large-frame drive sized for heavy motor loads — think pumps, fans, conveyors in the 500+ HP range where you need a robust VFD with a straight line to the motor rating.
The 700 HP rating at 460 V three-phase sets the motor capacity this drive can handle continuously. That is the headline number a sourcing buyer or integrator checks first: if your motor nameplate is 700 HP or less at that voltage, this drive covers it without derating. The FRENIC-ECO (F1) series is Fuji's general-purpose heavy-duty line, so expect standard V/Hz and sensorless vector control — nothing exotic, but reliable for fixed-speed or simple variable-speed applications on large induction motors.