Chemical Feded Pump Drive Question

[tgreif]

In the past, variable spped control of small chemical feed pumps has been done using DC drives. Lately, we're seeing more AFDs used with standard induction motors. Does anyone have any feelings regarding which of these technologies is more appropriate for chemical feed? DC drives required more maintenance with respect to brush replacement and the related need to stock spare DC motors which were more expensive. I'd appreciate any insight on where the technology is headed now.

 

[glennpan]

TGreif,

We sell a lot of chemical feed pumps. In the last several years there has been a growing movement of using AFDs. It is perfectly acceptable to use either an AFD or a DC drive for this service, and in most case just a matter of style preference. I personally prefer using the DC drives for pumps requiring 1 HP motors or smaller, and go to the AFDs for larger sizes.

Glenn