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Engineering guide

Closing the Pressure Loop on a Pump VFD

A pump VFD pressure loop is easiest to understand when the control target is named: keep pressure stable while the variable frequency drive adjusts pump speed. In the Boray catalog, the pump-focused entries are the FS200 Series Intelligent Pump AC Drive, the FS300 Series Intelligent Pump AC Drive, and the BR300-IP54 Smart Water Pump VFD.

Why a pressure loop needs a variable frequency drive

In a closed pressure loop, the pump must respond to changing demand without hunting or overshooting. A variable frequency drive is the actuator side of that loop: it changes motor speed so the system can hold pressure closer to the setpoint. The Boray catalog names this category directly with the FS200 Series Intelligent Pump AC Drive, the FS300 Series Intelligent Pump AC Drive, and the BR300-IP54 Smart Water Pump VFD.

Start with pump-specific drive families

For pressure control applications, it is cleaner to map the job to drive families that are already named for pump duty. The FS200 Series Intelligent Pump AC Drive and FS300 Series Intelligent Pump AC Drive are listed as intelligent pump AC drives, while the BR300-IP54 Smart Water Pump VFD is listed as a smart water pump VFD. Those catalog names help identify the intended application context before any detailed selection.

How the transducer closes the loop

A pressure transducer converts the measured pressure into a signal for the control loop. The drive then changes output frequency to the pump motor, and the transducer feeds back the new pressure result. This is the core idea behind the guide title: the variable frequency drive is not just running the pump, it is the speed element inside a pressure feedback loop.

Commissioning checks that match the catalog names

When commissioning a pump VFD pressure loop, verify the sensor signal, setpoint, and response direction before extended operation. For the catalog entries named FS200 Series Intelligent Pump AC Drive, FS300 Series Intelligent Pump AC Drive, and BR300-IP54 Smart Water Pump VFD, the application focus is pump control, so pressure stability and smooth speed changes are the main commissioning targets.

Selecting the right Boray product entry

Use the catalog naming as the first filter: FS200 Series Intelligent Pump AC Drive and FS300 Series Intelligent Pump AC Drive for intelligent pump AC drive contexts, and BR300-IP54 Smart Water Pump VFD for smart water pump VFD contexts. This keeps the product mapping grounded in the Boray catalog while the pressure loop remains the application story.

Apply this to your project

Send the motor ratings, duty and site conditions and Boray will specify the series.

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