Constant Pressure Water Pump VFD for Building Booster Systems

A constant-pressure water pump VFD adjusts pump speed according to real water demand. With a pressure transmitter and PID control, it can reduce pressure fluctuation, avoid repeated start-stop operation, and improve comfort in hotels, apartments, factories and commercial buildings.

Recommended Configuration

What Must Be Confirmed?

• Motor power, voltage, rated current and frequency.
• Required pressure range and maximum flow demand.
• Pressure sensor range and signal type.
• Pipe condition, check valve and pressure tank size.
• Whether single-pump or multi-pump control is required.

Selection Logic

Select the drive by motor rated current, not only by kW. The sensor range must match the target pressure, and PID parameters should be adjusted after the pump is running. Slow acceleration and sleep/wake settings help reduce water hammer and unnecessary running.

Common Mistakes

• Using a pressure switch only and expecting smooth pressure.
• Selecting a VFD without checking output current.
• Installing the sensor too close to unstable flow points.
• Setting PID too aggressively and causing pressure hunting.

AUSENIST Solution

AUSENIST YS620 and YS820 pump drives support pressure feedback, PID operation, motor protection and OEM cabinet integration. Model selection should be confirmed from the motor nameplate and site pressure requirement.

FAQ

Can one VFD keep water pressure stable?

Yes, when the pressure sensor, pump curve and PID settings are correctly matched.

Is a pressure tank still needed?

A small tank is useful for buffering and reducing frequent wake cycles.

What data is needed before ordering?

Send the motor nameplate, pump model, target pressure, sensor range and supply voltage.

Related AUSENIST Pages

• 3kW 230V single-phase input VFD for a hotel booster pump
• YS820 three-pump constant pressure VFD controller

Send AUSENIST your pump and pressure data. We can recommend the VFD model and basic parameter setup.