SCR Control Systems and Custom Controls 85 NATIONAL OILWELL SETS THE INDUSTRY STANDARD FOR DRILLING RIG SCR SYSTEMS. Simplicity of operation, ease of maintenance, superior performance, reliability, customer support, and product standardization are just a few of the reasons that more than 10,000 Ross Hill SCR bridges have been placed in systems of satisfied customers. Our innovative control systems: • Increase drilling reliability and efficiency. • Increase automated rig safety and efficiency. • Provide new technology that permits operation in previously untouched areas. • Provide the optimal customer solution. When planning your next project, contact our sales staff and application engineers. You will find them an excellent source of knowledge with creative ideas. CUSTOM REQUIREMENTS. National Oilwell is committed to providing industry leading solutions. When adding a third mud pump, independent rotary, power swivel, or generators, we engineer and modify an existing system as required.  We will refurbish an old system, electronics, bridges, assignment, or MCC changes,   . . . whatever it takes. THE ROSS HILL PRODUCT LINE INCLUDES: •  SCR Control Systems. • PLC based SCR Systems. •  Engine Generator Controls. •  Field Supplies. •  Active Power Factor Corrector. •  Block Controllers. •  Power Limit Controller. •  Mud Pump Synchronizers. •  Motor Control Centers. •  Low Voltage Switchgear. •  Medium Voltage Switchgear. •  B.O.P.  Controls. •  Mark II Soft Torque System. Manufacturing capabilities also include sheet metal and Power Control House fabrication. We can design a customized Control House to meet your requirements. A National Oilwell Field Service Engineer changes parameters on a Ross Hill SCR Drive equipped with Digital Control Modules.