Product Description:

The VT-VPRAP1-540-10/V0 is an electro-hydraulic amplifier card produced by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. Installed inside a control cabinet, it translates electrical command inputs into hydraulic setpoints so that hydraulic actuators can achieve precise flow or pressure regulation on automated machinery. The board links the machine control system to the hydraulic section, bridging low-level analog signals and the power required by servo-controlled cylinders or motors used in manufacturing cells, presses, and test rigs.

Core regulation is executed in a P/Q closed-loop configuration, where the card simultaneously monitors pressure and flow feedback to minimize deviation from the requested operating point. Its output stage is dimensioned for direct actuation of proportional valves, meaning the valve solenoids receive conditioned current that varies linearly with the reference signal. Precise matching between the commanded spool position and the valve’s actual displacement is achieved through electrical position feedback, allowing tight hysteresis control across the full stroke. The module draws system power from a single 24 V supply, which simplifies cabinet wiring and avoids the need for multiple auxiliary rails. Its physical length is 190 mm, so it fits standard Euro-card guide rails without exceeding common rack depth.

The board is supplied as a printed-board assembly, so it can be installed as a complete module while upstream and downstream connectors remain fixed in the rack. A panel width of 130 mm leaves room for adjacent monitoring modules while still providing enough area for signal conditioning, gain potentiometers, and diagnostic LEDs. Because its control strategy was tailored for hydraulic stations equipped with a radial piston pump, the amplifier can balance pulsating pump delivery with the dynamic demands of the closed loop and maintain stable actuator response as machine duty cycles change.