Constant Pressure Control / VFDs
|
|
Single Pump Application |
Multiple (2-4) Pumps Application |
In constant control pressure applications, a pressure transducer is mounted at the pump discharge and is wired to the Variable Frequency Drive (VFD). In Automatic Mode, the Drive will run the pump and continuously make speed adjustments until the Pressure Feedback = Set Pressure (Target Pressure). The VFD uses P.I. (Proportional + Integral) control to calculate the required speed corrections as the feedback pressure drops or rises above the set pressure. In no-flow conditions, the Drive will reduce the pump speed to the "minimum speed setting" and it will eventually go into a "sleep mode" (pump stop). Upon a pressure drop below the "start pressure" the Drive will "wake up" and run the pump again.
|
 |
