SJE-Rhombus introduces the CPN1 Duplex VFD Controller, designed to work with two CPN1 or two CP3R variable-frequency drive (VFD) control panels for constant-pressure applications.

The CPN1 Duplex VFD Controller alternates the lead control of two CPN1 or two CP3R VFD control panels, based on the accumulated run time of each variable-frequency drive (the controller must be mounted indoors). This pre-programmed controller is designed to work out-of-the-box to control the lag pump operation in the duplex system as to maintain the operating pressure under high demand. The controller features pump run status for both lead and lag pumps and lead pump indication. The lead shift hours are adjustable from 1 hour to 24 hours. UL/cUL-listed, this controller comes with a three-year limited warranty.

To learn more about the CPN1 Duplex VFD Controller, visit