Water Pump VFD Dry-Run Protection Settings

Dry running can damage seals, bearings and impellers. A water pump VFD can help detect no-water operation by monitoring current, pressure, flow or level signals, then stopping the pump before damage becomes serious.

Recommended Configuration

What Must Be Confirmed?

• Normal running current at different flow conditions.
• Whether pressure, flow or level sensors are installed.
• Safe restart interval after a dry-run alarm.
• Pump type and minimum cooling flow requirement.
• Site water source stability.

Selection Logic

Current-based dry-run protection is simple, but it must be tested at the real operating point. Sensor-based protection is usually more reliable when the water source changes often. Use a delay to avoid false trips during startup or valve changes.

Common Mistakes

• Setting the dry-run threshold without site testing.
• Restarting too quickly after a no-water alarm.
• Using current protection only for complex pipe systems.
• Disabling alarms to avoid nuisance trips.

AUSENIST Solution

AUSENIST pump VFDs support practical dry-run protection strategies for booster, transfer and well pump systems. The final parameters should be adjusted during commissioning.

FAQ

Is current-based dry-run protection enough?

Sometimes. It works best when pump load changes clearly during no-water operation.

Should automatic restart be enabled?

It can be used, but the restart interval must protect the pump and water source.

Can a level sensor be used?

Yes. A level switch or transmitter is often reliable for tanks and wells.

Related AUSENIST Pages

• Deep well pump VFD selection
• Constant pressure water pump VFD

Send AUSENIST your pump type and site control signals. We can suggest dry-run protection settings.