The Fuji FRN125F1S-4DY is a FRENIC-ECO Pump (F1-DY) drive rated for 125 HP on 460V three-phase input. This is a pump-specific variant in the FRENIC-ECO family, meaning the control firmware is tuned for centrifugal pump and fan loads — think variable-torque curves, built-in PID for pressure or flow regulation, and sleep/wake functions for system efficiency. It is not a general-purpose drive; if your BOM calls for pump-duty logic, this is the correct variant. At 125 HP and 460V, this drive sits in the mid-to-large range of the FRENIC-ECO line. The F1-DY suffix flags the pump-optimized firmware package, which includes features like multi-pump cascade control and fire-mode override. For a water/wastewater or HVAC pumping station, that means one less PLC program to write.
Mounting is panel-mount, sized for a 125 HP frame. The 460V three-phase input means it connects directly to a 480V distribution bus without a step-down transformer. Output to the motor is three-phase variable voltage/frequency up to the rated 125 HP. Plan for input fusing or a branch-circuit protective device sized per NEC Article 430 for a 125 HP motor at 460V — typically around 200–250 A class J fuses or an inverse-time breaker.