- Reaction score
- 13,478
The current will vary with the load but on a centrifugal pump the relationship might not be obvious. Unlike a positive-displacement pump where the motor has to work harder with increasing total head, many kinds of centrifugal actually decrease in power consumption with increased head / throttled flow because of the fluid dynamics inside the impeller. Pumps of this type can overload their motors by letting them pump too freely e.g. full bore against zero head, but will not be overloaded even when the flow is completely shut off. The motor itself will always draw more current with increasing shaft load though.