Chilled Water Pump Control using VFD 1

[alanElec]

I am using a VFD to control a constant pressure water pump.In the technical specifications of the pump,it says 90% load at 50 hz.
1.Is it possible for me to load the pump above 90% by using VFD?(by increasing/decreasing frequency?)
2.If I were to operate the pump at 45 hz,what would the motor current be?Please provide me formula for relation between current and frequency...

Thanks & Regards,

Alan

 

[bimr]

Yes, you may operate the VFD at 60 Hz.

You need to graph the pump curve and system curve. Hertz is a program that allows entry of a system curve so that you can evaluate the performance of your pump selection against the system curve.

Hertz program:

http://www.pumped101.com/index.html#HERTZ

Pump Selection for VFD Operation:

http://www.pumped101.com/vfd pump selection circulation.pdf