The VARIOspeed® VFD by SJE-Rhombus® is designed specifically for pressure control applications. As the flow and head conditions change in the pumping system, the VARIOspeed® VFD is able to automatically control the pump speed and maintain a constant discharge pressure. The desired set pressure is set using the user friendly VFD keypad. The pressure transducer measures the pump discharge pressure.

The VARIOspeed® VFD is available from 5 to 150 hp at 208 to 240V and 5 to 250 hp at 380 to 480V, single-phase or three-phase supply voltage. Built-in features include P.I.D. control, energy optimization control, adjustable electronic overload, automatic system restart, high and low pressure alarms, and more.

The standard VARIOspeed® VFD is supplied in a NEMA 3R enclosure with a 0-200 PSI pressure transducer. SJE-Rhombus® is a UL certified panel shop that can customized the VARIOspeed® VFD to suit specific requirements, including duplex, triplex, and quadplex VFD systems with automatic alternation and lead/lag operation.