The Fuji FRN050F1S-2DY is a FRENIC-ECO Pump (F1-DY) drive rated for 50 HP on 230V three-phase input. This is the pump-specific variant of the FRENIC-ECO family — the firmware and I/O are tailored for centrifugal load profiles: quadratic V/f curve, PID sleep/wake for wet-well level control, and a built-in pump-cleaning cycle that briefly overspeeds the impeller to clear ragging. If you are retrofitting a lift-station or a constant-pressure booster set, this is the drive that ships with the pump macros pre-loaded.
At 50 HP and 230V three-phase, this drive is sized for a 40–50 HP submersible or end-suction centrifugal pump — typical for a 6-inch to 8-inch discharge in a municipal lift station. The F1-DY firmware includes a dry-well detection input that can be wired to a float or conductivity probe; the drive will fault out before the pump runs dry and cooks the mechanical seal. The 230V class keeps you on a 208–240V service without a step-up transformer, which matters when the pump panel is fed from a 240V delta secondary.
Mounts in a standard enclosure. Verify gland-plate clearance for the incoming 3-phase and motor leads.