Overview

The Rexroth VT-VRRA 1-527-20/V0/2STV is a precision analog valve amplifier designed for high-response proportional directional valves with electrical position feedback. Its built-in PID control ensures fast, accurate, and repeatable positioning, making it essential for high-speed, precise hydraulic axis control.

This amplifier is widely used in industrial hydraulic systems requiring stable, high-dynamic performance, such as metal forming, die-casting, and simulation test benches.

Technical Data

Typical Applications

• Metal forming presses and die-casting machines – precise control of clamping and movement sequences

• Machine tools – accurate cutter or workpiece positioning

• Simulation equipment and test benches – accurate force and velocity profile generation

• Industrial hydraulic systems – closed-loop position control for fast and stable valve operation

The amplifier’s PID control ensures minimal steady-state error and high-speed correction for any disturbances, delivering exceptional dynamic performance in demanding applications.

Frequently Asked Questions (FAQ)

Q1: What does the "2STV" option in the part number indicate?
A: It usually represents a special configuration or block installation valve control feature, often related to pilot-operated directional control valves with linear or progressive fine control characteristics.

Q2: How does the PID behavior enhance valve control?
A: The PID controller continuously compares the command value to the actual position feedback. Any error is instantly corrected, allowing the valve spool to reach and maintain the commanded position quickly and accurately.

Q3: Why is cable break detection for the actual value important?
A: It protects both the machine and personnel. If the feedback cable breaks, the control loop opens, and the output is immediately switched off to prevent unpredictable valve behavior.

Q4: Can this analog amplifier be used with digital systems?
A: Yes. While the VT-VRRA is purely analog, it can be integrated into a digital system via a PLC or motion controller that provides the required ±10 V command output.