Variable torque VS. Constant torque

[chaseme5]

I just wanted to know for a centrifugal water pump what is better. The VFD controlling the pump is designed for constant torque.

 

[Valveman]

Constant torque is only needed for machine tools and things like that where a VFD has the potential of actually being useful. Constant torque is not needed for centrifugal pumps, but neither is a VFD unless you just like spending extra money.

 

[chaseme5]

The VFD Drive on our system is constant torque drive. Apparently it is the wrong type of drive for our application.

 

[Valveman]

I think it will still work. It is not that you have the wrong drive, it is that a drive is not the right thing to have.