tjmurf
Specifier/Regulator
- Apr 25, 2003
- 37
Gentlemen;
Please help me out here. What is the best operational sequence to operate 3 identical centrifugal pumps which are driven with VFD's.
This is in a sewage application so the load varies.
In single pump mode everything is straight forward. The speed will vary between two level points and a minimum and maximum speed. If the flow is too low the drive will shut down and wait for the well to fill.
In two or three pump mode, should all of the drives be operating at the same speed? For example, pump 1 is at 100% speed while pump 2 is varying speed to match the well level.
Or as in the previous example, should both pumps speeds vary and match the fill rate of the well.
Is one method preferred over the other?
Thanks in advance!
tjmurf
Please help me out here. What is the best operational sequence to operate 3 identical centrifugal pumps which are driven with VFD's.
This is in a sewage application so the load varies.
In single pump mode everything is straight forward. The speed will vary between two level points and a minimum and maximum speed. If the flow is too low the drive will shut down and wait for the well to fill.
In two or three pump mode, should all of the drives be operating at the same speed? For example, pump 1 is at 100% speed while pump 2 is varying speed to match the well level.
Or as in the previous example, should both pumps speeds vary and match the fill rate of the well.
Is one method preferred over the other?
Thanks in advance!
tjmurf