Constant Pressure Systems (VFDs)

Categories:
Motor Controls

Description

A Constant Pressure System using a Variable Frequency Drive (VFD) is an advanced pumping solution designed to automatically maintain a stable and consistent water pressure, regardless of changes in flow demand. The VFD adjusts the speed of the pump motor in real time, depending on how much water is needed — slowing down when demand is low and speeding up when it increases. This improves energy efficiency, reduces mechanical stress, and extends the lifespan of the pump system.

Commonly used in commercial buildings, residential water supply systems, irrigation, and industrial processes where pressure stability is critical.

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Specifications

  • Pump Type: Centrifugal pump (single or multistage)

  • VFD Controller:

    • Input Voltage: 230V / 1Ø or 400V / 3Ø / 60Hz

    • Output Frequency: 0–60Hz (variable)

    • Display: Digital interface for pressure setpoint, faults, and motor speed

    • Features: Soft start/stop, pressure sensor input, overload protection, PID control

  • Motor Rating: 1 HP to 20 HP (depending on application)

  • Pressure Range:

    • Setpoint adjustable: Typically 30–100 PSI

    • Pressure sensor: 4–20 mA or 0–10V feedback

  • Flow Rate: Varies depending on system design (e.g. 10–500 GPM)

  • Control Panel Includes:

    • VFD with built-in controller

    • Pressure transducer

    • Circuit breaker

    • Auto/Manual selector switch

    • Run/Fault indicators

  • Enclosure: NEMA 3R or NEMA 4 (outdoor use) / IP55 or higher

  • Application:

    • High-rise building water supply

    • Agricultural irrigation

    • Industrial water process systems

    • Fire protection pressure maintenance (in some designs)

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