Variable Speed Drives (VSD) vary the frequency of the power delivered to the ESP motor, thereby changing motor and pump RPM, allowing production volume flexibility. COSCO supplies a number of VSD packages from several different manufacturers:

• Low Voltage VSD's
• Medium Voltage VSD's
• NEMA 1, 3R, 4, or 4X enclosures
• Skid mounted or building enclosed packages
• Air conditioning or liquid cooling available for high ambient temperature applications

VSD's can damage system insulation, shortening the run life of the ESP installation. Therefore, the technologies, input filters and sine-wave filters utilized, are of significant importance if variable speed capability is required