We're specifying a portable (moved around as we renovate 10 stations over the next 8 years) hydropneumatic pump station with 2 duty 1 standby centrifugal pumps with VFD drives. The pumping rate is proposed to be tied to the flow rate out of station. If the first pump can't keep up, we start the second pump. Do we have to program the VFD to match only half the flow signal once we turn on second pump? How is this handled? Pumps will all be one horsepower rating, which is not yet fixed but will be in the range of 15-50 HP.
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