Product Description:

The VT-VRPA1-527-10/V0/PV is an electric amplifier card produced by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. Intended for closed-loop control of proportional pressure valves in industrial hydraulics, the module conditions command signals and delivers regulated current to a matched DREB6X valve, enabling stable pressure regulation within automated machinery. It is suited for systems where hydraulic pressure must follow an electrical command signal with consistent response during repeated machine cycles.

This amplifier is built in the Eurocard format and slides into a 19-inch rack where it receives a supply of 24 V DC. Under maximum load, the board draws 1.5 A and its overall power absorption is limited to 35 W, which helps size the power supply and thermal management correctly. All electrical interfaces land on a DIN 41612-F32 plug connector, allowing rapid exchange without rewiring. Internally, a feedback excitation signal of 10.2 Veff at 7.8 kHz is generated for LVDT transducers, while the input stage accepts command sources that exhibit up to 1 kΩ resistance, maintaining signal integrity even with long field cables.

The power stage can deliver a solenoid current of 2.7 A, which translates to a coil power of 25 W so the paired valve reaches full operating force. A dedicated potentiometer output provides +10 V with a continuous capacity of 10 mA for external setpoint potentiometers or reference sensors without overloading the card’s regulator. The amplifier’s potentiometer supply, combined with its internal feedback source, forms the reference network that keeps commanded and actual pressures aligned. This arrangement supports repeatable pressure ramps and helps minimize overshoot in automated presses, die-casting machines, and similar equipment.