Rexroth A4VSO355 Hydraulic Pump 280 Bar Axial Piston Pump

The A4VSO series offers a wide range of control methods to suit various hydraulic system requirements. The primary control types include:

• DR: Pressure Control (or Constant Pressure Control)
• FR: Flow Control
• LR: Dual-Line/Hyperbolic Constant Power Control (Automatically regulates power consumption)
• MA: Manual Control
• EM: Electric Motor Control
• HM: Hydraulic Control, Flow-Dependent
• HS: Hydraulic Control with Servo/Proportional Valve
• EO / EO2: Electronic Proportional Control
• HD: Hydraulic Control, Pressure-Dependent
• DS: Speed Control for Secondary Control

The control method is a critical part of the pump's model designation. It is typically represented by two or three letters in the code sequence (e.g., A4VSO180DR/30R-PPB13N00). In this example, DR signifies the control type, which is Pressure Control. Other suffixes like LR (Constant Power), FR (Flow Control), or EO (Electronic Control) directly indicate the specific control method employed by that pump unit.

The choice of control method depends heavily on the application's needs:

• DR (Pressure Control): Ideal for systems requiring a constant pressure level, often used in clamping circuits or press applications.
• LR (Constant Power Control): Well-suited for applications where the input power needs to be limited automatically, protecting the drive system despite pressure and flow variations, potentially useful in mobile equipment or complex industrial machinery.
• EO (Electronic Proportional Control): Offers precise control over pump operation (like flow or pressure) via an electrical signal, commonly found in modern automated machinery and process control systems requiring high precision.
• FR (Flow Control): Used when a constant flow output is desired regardless of pressure changes (within the pump's capabilities).

For comprehensive technical data, performance curves, detailed installation guidelines, and specific safety information for any A4VSO pump model and its control method, you should always consult the official technical documentation or product datasheet provided by Bosch Rexroth or their authorized distributors. The exact specifications, such as response times and control parameters, can vary between different sizes (e.g., 40, 71, 125, 180, 250) and control versions within the A4VSO series.

Disclaimer: This FAQ provides a general overview based on publicly available information. For precise technical details, selection, and application guidance, always refer to official Rexroth documentation or contact their technical support.