Variable Frequency Drives (VFD Panels)

Motor speed control for pumps and fans, linked to the sensors that set the demand.

A variable frequency drive changes motor speed by changing the frequency of its supply. In a building it lets pumps and fans run to demand rather than at full speed. A pressure or air quality reading gives the controller its reference, and the drive reports its status back to the BMS.

Applications

  • Chilled water pumps
  • AHU supply and extract fans
  • Car park ventilation fans
  • Booster pump sets

What it includes

  • Variable frequency drive in a panel
  • Incomer with isolator and fuses
  • Line reactor or filter, and output filter where needed
  • Differential and static pressure transmitters
  • Run and fault relays to the BMS

Networks

  • Modbus RTU
  • BACnet MS/TP
  • 0-10 V
  • 4-20 mA