centrifugal pump over current

[Wedoca]

what are some of the common cause for a submiserable centrifugal pump to go over current ???
hydualicly speaking ....

another question .... will a centrifugal pump, pump in the right direction even the impeller is rotating in the wrong direction?? if yes, what are some of the by product of that???

 

[itsmoked]

Over current can be caused by:
Bearings failing.
Not enough restriction in flow.
Motor stalled.

Yes the water will continue to flow in the correct direction but you may only get %50 of the flow you are paying for.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[jraef]

A real common cause that I see now is when VFDs are used, and people think they can get more flow by over speeding the motors using the VFD, "because they can". They don't realize that power will increase by the CUBE of the speed increase, so they get a little motor flow and a LOT more power consumed.


"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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[ozmosis]

are you using a VFD on the pump?

 

[BJC]

Check the pump curve. Most pumps can do more owrk than the motor that powers them will supply. You can be pumping more water higher that motor will deliver.
Flow x Head = work.

 

[Wedoca]

Answer to OZ, yes ...I am using a VFD

 

[jraef]

So what is the maximum speed setting of the VFD? Did someone tweak it trying to get more flow from the pump?


"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> faq731-376