SJE-Rhombus International Product Details

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CP3R VFD Control Panel

Pre-Engineered NEMA 3R Control Panel

The CP3R Control Panel is pre-engineered NEMA 3R rated panel for constant pressure applications.

The CP3R VFD Panel is an economical option for constant pressure control applications of 1.5, 3.0 or 5.0 HP using a single variable frequency drive (VFD). This pre-engineered simplex control panel features a factory-programmed VFD for your specific pressure control application for easy installation.

The NEMA 1 rated enclosure is suitable for outdoor operation and features ventilation for VFD cooling. The CPN1 panel includes one 0-100 PSI pressure transmitter.

Common applications include water features, sprinklers, drip and pivot irrigation systems, lift stations, fire suppression systems and air compressor systems.

CPN1 Duplex Controller

OPTIONAL Duplex Controller
The CPN1 Duplex Controller alternates the lead control of two CPN1 panels or two CP3R panels, based on the accumulated run time of each variable frequency drive (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 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 1-24 hours.


CP3R VFD Control Panel



  • NEMA 3R enclosure suitable for outdoor operation
  • Enclosure ventilation for VFD cooling


  • Available for 208/230V motor applications
  • Incoming power low noise EMI filter
  • Best suited for applications up to 17 FLA
  • Single phase incoming power applications
  • Simplex motor application
  • PID control
  • Run time
  • System shutdown input
  • Easy set up
  • UL/cUL Listed 508A


  • 0-100 PSI
  • NEMA 4X rated


  • Panel Heater


  • 5-year limited warranty on the VFD (drive only)
  • 1-year limited warranty on the CPN1 Panel (excluding the drive)

UL/cUL Listed




CP3R VFD Control Panel


45.72 x 40.64 x 25.40 cm (18 x 16 x 10 inches) Type 3R fiberglass for outdoor or indoor use

Pressure Transducer/Pressure Shutdown Terminal Block

Ground Lugs

Variable Frequency Drive

Fan Fusing

Main Circuit Breaker


Incoming Power and Motor Terminal Block

Adjustable Fan Thermostat

Air Vent and Filter


Available Downloads

Adobe Acrobat is a free download to view .pdfs

Visit our downloads section of this website for additional literature.

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