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Fixed Speed Drives

Simplify system protection in fixed-speed applications

Our fixed speed drives are simple, compact units for fixed-speed applications and provide consistent electrical system power and protection for downhole ESP systems. They are designed to protect ESP systems in case of major surface or downhole electrical system failure—reducing maintenance costs and increasing well and pump performance

  • 6-pulse LVDs distort the electric current 25%, depending on power system impedance.
  • 12-pulse LVDs distort the electric current 11%.
  • 18-pulse LVD distorts the electric current 5%, depending on power system impedance.
  • MVDs distort the electric current under 5%.

Maintain wellsite integrity

Protection, control, and data acquisition with INSTRUCT acquisition and control unit for ESPs

INSTRUCT acquisition and control unit

INSTRUCT Drive EFX fixed speed drives

Protect your ESP system from surface or downhole failure


The modular INSTRUCT Drive EFX fixed speed drives provide electrical system protection for downhole electrical submersible pump (ESP) systems in a fixed-speed application. They also provide an effective platform for analyzing well and pump performance in real time.

The INSTRUCT Drive EFX  incorporate a combination of a fused main disconnect switch (or circuit breaker) with a vacuum (or air-break) contactor that connects ESP systems to the surface power supply. This provides maximum protection for the ESP system in case of major surface or downhole electrical system faults. Built-in lightning arresters protect the downhole pump system from spikes in the supply system caused by lightning strikes.

  • Voltage rating: 480–5,000 V (depending on model)
  • CSA-type 3R enclosure
  • Operating temperatures: –40 to 122 degF [–40 to 50 degC]
  • Multitap control power transformer

Monitor for complete control

The INSTRUCT Control UAC1 Universal Acquisition Controller is located in a separate low-voltage compartment that houses the drive components. The UAC1 provides extensive electrical system monitoring and protection against both surface and downhole electrical faults. The current transformer in the INSTRUCT Control UAC1, together with its burden module, provides true rms three-phase current monitoring. Three instrument-potential transformers provide directly measured three-phase voltages. The optional A095 backspin shunt provides backspin and leg ground protection.

View INSTRUCT Control EFX Fixed Speed Drive product sheet

For more information please contact us

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