ePAC™ II Variable Speed Drive for Rod Pumping

The challenge in controlling rod pumping wells is to match the pumping speed to the varying production capacity of the well while protecting the system from mechanical damage.

What is needed is infinitely variable speed control with controlled torque throughout the speed range.

Weatherford meets this need with the ePAC II rod pump controller (RPC) providing precision torque and speed control to ensure that the well pumps at the required speed and torque through out the stroke.

The ePAC II RPC not only allows you to match the drive speed to well conditions, but also supplies the required torque to operate when fully loaded. Precision torque control also means there is no need to oversize the drive relative to the motor for pump startup.

Drive reliability requires the proper enclosure to protect the sensitive electronics from foreign material as well as extreme temperature variations. The ePAC II RPC uses an engineered package with through-hole mounting of the amplifier heat sink to both reduce the heat and the overall size of the cabinet.

The enclosure layout provides additional room for optional internal components while Type 3R protection and electrical door interlocks enhance the safety of the package.