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Variable Speed Pump Controls

A borehole or private water system is made up of many different components and controls. Depending upon the requirements and application there may be different control options available.


A variable speed controller is capable of maintaining a constant pressure in relation to varied flow rates. As with fixed speed controllers they are available in both single and 3 phase with a variety of power ratings. The set pressure can be adjusted and the various settings and related error warnings can be viewed.

The variable speed controller is usually made up of:

  • An inverter
  • A pressure sensor
  • A flow sensor

Some advantages of using a variable speed controller are:

  • Greater energy saving
  • Greater noise reduction
  • Reduced dimensions
  • Eliminates over pressures
  • Increased lifespan of the electric pump

Most variable speed controllers are equipped with a malfunctions protection system. In the event that a malfunction is verified, it is usually signalled on the display and, depending on the type of error, the electric pump will turn off.

  • Protection against dry-running
  • Amperometric protection
  • Electric pump overheating protection
  • Protection against abnormal power supply voltages

Variable speed pump controls are not right for every application. For more information on pump control systems and to discuss your requirements please call the office


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