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 VFD recommendations variable frequency drive
  (2 MB)
General guidelines for design of VFD controlled pump systems. Explains the basic principles of a VFD, how the system is affected by variable speed. Other technical aspects such as running above nominal frequency, cooling, clogging, use of filters and shielded cables etc. are also covered.

 Economical aspects of variable frequency drives in pumping stations  (2 MB)
Compares energy consumption for VFD controlled systems vs. ON-OFF controlled systems.


Technical aspects VFD (Rolf L)  (436 KB)
Energy comparison VFD vs. On-off controlled pumping stations