SJE-Rhombus International Product Details

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5HP - 150HP Constant Pressure Applications

Variable Frequency Drive for pressure control applications.

The VARIOspeed® LCD Drive has been factory pre-programmed for specific pressure control applications. 

As flow and head conditions change in the pumping system, the VARIOspeed® LCD Drive is able to automatically control 
the pump speed and maintain a constant discharge pressure. The desired set pressure is set on the VFD keypad. The pressure transducer measures the pump discharge pressure. 




Para Aplicaciones de Presión Constante de 5HP - 150HP

El VARIOspeed® LCD Drive (VFD) ha sido pre programado de fábrica para aplicaciones específicas de control de presión. A medida que las condiciones de flujo y de cabeza cambian en el sistema de bombeo, el VARIOspeed® LCD Drive puede controlar automáticamente la velocidad de la bomba y mantener una presión de descarga constante. La presión de operación deseada se ajusta en el teclado del VFD. El transductor de presión mide la presión de descarga de la bomba.

Incluye transductor de presión de 0-200 PSI (4-20 mA)






  • Available HP range
    • (208 - 240V) 5HP - 40HP
    • (380 - 480V) 5HP - 50HP
  • Models available for single phase or three phase supply voltage
  • UL Listed for single phase and three phase supply voltage
  • Energy optimization control


  • PID control
  • Hand/Off/Auto selector switch
  • Adjustable electronic overload
  • 0-200 PSI transducer (4-20 mA signal)
  • Auto Start on pressure drop (adjustable)
  • Auto Stop on no-flow (sleep mode)
  • Pre-charge control (gradual pipe pressurization)
  • High and low pressure alarms
  • Automatic system restart
  • Low water shutdown digital output
  • 2 relay outputs
  • 2 analog outputs
  • Modbus RTU communication (RS-485)
  • One-year limited warranty


  • DISPLAY: Minotor Backlit LCD
  • MENU: Displays parameters and drive data
  • FUNCTION KEYS: Navigate through parameters, monitored data, and save changes
  • SETTING DIAL: Scroll through paramter list and edit parameter value

VARIOspeed® HMI VFD Operator Interface Screens






For specifications on the VARIOspeed® LCD Drive, please contact the factory at 1-888-342-5753.


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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