Variable Frequency Drive

This system is a complete package designed to provide constant water pressure in any domestic and light commercial water supply, irrigation system, livestock watering or water transfer. It is comprised of systems based around an SP pump (2, 3 or 5 HP) and CU331SP Control Unit.

 

The CU331SP is a constant pressure, variable frequency drive based on a proven product platform. CU331SP is a strong supplement to the Grundfos SmartFlo constant pressure program. This new product is designed to easily adapt to any combination of 2HP, 3HP or 5HP Grundfos SP pump systems using a 3-phase motor. This wall mounted system maintains a constant pressure within the maximum pump performance in spite of varying water consumption. The CU331SP is programmed with parameter settings optimized for submersible pump applications. An easy to follow Start-Up Guide walks the installer through a few screens and completes the set-up.

 

Features & Benefits

 

Easy setup – simply run the Start-up Wizard and choose pressure set-point

The system determines the direction of rotation and sets the dry-run function, according to the pump

System design approach – the CU331SP works with any combination of matched pump and motor

CU331SP works with 2, 3 or 5Hp submersible pumps to fulfill your constant pressure requirements

Matched pump & motor – 2HP pump on 2HP motor, 3HP pump on 3HP motor, 5HP pump on 5HP motor

Built-in protection features – Soft start, dry run, overload, over/under voltage, sensor alarm, alarm relay and run relay

Wide voltage range – input: single phase 208 – 240VAC output: 3-phase 208-240VAC

Indoor (NEMA 12) or outdoor (NEMA 4X) enclosure options