VFD pump 1

[Raai2015]

All, I have a feed pump offer with VFD Installation which is with 50Hz and 2 poles , synchroneous Speed is 3000rpm. Querries are
1. To what minimum frequency or rpm i can go down ?
2. How can i calcualte the Minimum rpm or frequnecy (Hz)? because if i have any load lower than this rpm , i need to decide upon the requirement of control valve or Orifice.
3. I dont see a stall Region for the VFD offer. Can somebody enlighten this?
4. How abt the start up?

 

[ScottyUK]

I'll add that in a baseload application with constant drum pressure, a VFD is likely to be a poor choice of modulating element in the control scheme.