The NIKKISO HydroDrive AC Variable Frequency Drive is a variable speed control in a NEMA-4X / IP-65 washdown, watertight enclosure. It is designed to operate 208-230 Volt 3-phase AC induction motors through 3.6 Amps RMS. The sine wave coded Pulse Width Modulated (PWM) output operates at a frequency of 16Hz which provides high torque and high efficiency at a low noise level.

Due to its ergonomic engineering, the NIKKISO HydroDrive AC is easy to install and operate. Tailoring to specific applications is accomplished via selectable jumpers and trimpot adjustments, which eliminate the computer-like programming required on other drives. However, for most reciprocating pump applications no adjustments are necessary.

Main features include adjustable RMS Current Limit with l²t Motor Overload protection. In addition, adjustable Slip Compensation provides excellent load regulation. Power Start™ delivers over 200% motor torque to ensure startup of all pump designs. Electronic Inrush Current Limit eliminates harmful AC line inrush current and adjustable Linear Acceleration and Deceleration make the drive suitable for soft-start applications. The Ride Through feature provides a smooth recovery to the previous set speed during a momentary power loss and Regeneration Protection eliminates tripping due to rapid deceleration.

Standard front panel features include diagnostic LEDs, Manual Speed Potentiometer, Auto/Manual Switch, Start/Stop Switch, and a Power On/Off Switch. Other features include a barrier terminal block to facilitate field wiring, adjustable performance trimpots, modular circuit board, as well as electrical and optical signal isolation.