Bosch Rexroth has introduced an upgrade to the electrohydraulic controller used on the company’s A4VSO and A4VSG hydraulic axial piston components, which function as secondary control units in the Rexroth Active Heave Compensation (AHC) system for offshore winching applications.
The new Rexroth DS2R electrohydraulic controller, which replaces the previous DS1 model, features proportional valve technology for more reliability, easier maintenance and lower cost. The controller is fitted directly to the secondary control unit – axial piston equipment that can serve as both, a pump, or motor, to manage variations in torque on winch drives in rotary AHC systems. As part of the overall AHC system, the secondary control unit utilises either a Rexroth A4VSO (open loop control) or A4VSG (closed loop control) axial piston unit to provide the winch torque control when the AHC system is engaged.
The new DS2R controller comes with the Rexroth 4WRPH high-response proportional valve and offers several key engineering and operational advantages. Besides the DS2R, a DS2E version is available without the fitted Rexroth proportional valve. In addition, a DS2S controller is available with a servo valve instead of a proportional valve for test stand or other applications with very high dynamic requirements.