Deep Well Pump VFD Selection for Borehole Water Supply

A deep well pump VFD controls the speed of a submersible borehole pump to match water demand. It is useful for irrigation, tank filling and constant-pressure water supply, but the long motor cable and dry-run risk must be checked carefully.

Recommended Configuration

What Must Be Confirmed?

• Motor nameplate voltage, current and frequency.
• Well depth, static water level and dynamic water level.
• Cable length from VFD to pump motor.
• Required flow, head and discharge pressure.
• Whether a reactor or output filter is needed.

Selection Logic

Do not select only by pump power. Compare the motor rated current with the VFD output current and check cable voltage drop. For long cable runs, an output reactor may be required. Dry-run protection should be configured using current, pressure, flow or level signals.

Common Mistakes

• Ignoring long motor cable effects.
• Running the pump below safe cooling speed.
• Using one dry-run threshold for every well condition.
• Forgetting lightning and surge protection in outdoor sites.

AUSENIST Solution

AUSENIST pump VFDs can support borehole pump speed control, dry-run protection and sensor-based operation. Final selection depends on the motor nameplate, cable length and well operating data.

FAQ

Can a VFD protect a deep well pump from dry running?

Yes, with suitable current, pressure, flow or level-based protection settings.

Is the cable length important?

Yes. Long output cables may require derating, a reactor or an output filter.

Can it be used for tank filling?

Yes. The VFD can run from level control or pressure control depending on the system.

Related AUSENIST Pages

• 220V single-phase input to 380V output for a borehole pump
• Constant pressure water pump VFD

Send AUSENIST the pump nameplate, well depth and cable length for a suitable drive recommendation.