VFD or Contactors
VFD or Contactors
(OP)
Hello All,
I used to control 15HP pump motor with reversible contactors and overloads.
What advantage will I have if I go for VFD solution instead.
Any cost saving? Will I eleminate overload?maybe other advantages?
I can run pump slower by reducing frequency, this is small advantage to me.
Thanks
MHH
I used to control 15HP pump motor with reversible contactors and overloads.
What advantage will I have if I go for VFD solution instead.
Any cost saving? Will I eleminate overload?maybe other advantages?
I can run pump slower by reducing frequency, this is small advantage to me.
Thanks
MHH





RE: VFD or Contactors
RE: VFD or Contactors
*Energy saving however only comes into play if you can ELIMINATE some other form of flow control that is wasting energy, the savings come from reducing that waste. So if for example you have a 15HP centrifugal pump and you have a throttling valve to control flow (or pressure), then using the VFD speed change to control that will reduce the energy wasted across the throttling valve. It's a common misconception that just using a VFD to reduce speed will save on energy.
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RE: VFD or Contactors
How do you control the pump using the overloads ?
Seems there's more here than meets the eye.