Product Description:

The VT-VRPA2-527-10/V0/RTS is an amplifier card from the VT-VRPA Electric Amplifiers series produced by Bosch Rexroth Indramat. This Eurocard-format module provides electronic control for proportional directional valves and is suited for hydraulic systems that require precise solenoid current regulation. By converting a bipolar command voltage into a controlled solenoid current, the board links the motion controller to the valve so spool movement can be adjusted smoothly during machine operation. That arrangement supports stable control in machine tools, presses, and plastic processing equipment where analog valve actuation must remain predictable.

It operates from a supply of 24 V DC and, under nominal conditions, draws 1.5 A for a total power demand of 35 W. The output stage can deliver up to 2.7 A to the connected solenoid, which matches the requirements of the compatible 4WRP 6 proportional valve. A regulated reference of ±10 V is available for external setpoint generators, and the analog circuitry allows the command signal to pass through adjustable gain and ramp sections before current conversion. This analog approach helps the card respond without the timing delays associated with digital processing.

For feedback, the actual-value oscillator produces 10.2 Veff / 7.8 kHz, and the carrier signal is demodulated at the valve to monitor spool position without separate external sensors. The card plugs into a DIN 41612-F32 connector and follows the Eurocard mechanical outline, so it fits standard 19-inch subracks used in industrial control cabinets. A front-accessible trimming potentiometer of 1 kΩ allows fine gain adjustment, while onboard comparators supervise the output stages and a jumper selects the current-feedback path for the intended valve type. The front-panel adjustment and simple feedback selection make the module easier to match to the connected hydraulic stage.