Product Description:

The VT-VRPA 1-537-10/V0/QV-RTP is a plug-in proportional amplifier card produced by Bosch Rexroth Indramat for the VT-VRPA Proportional Amplifiers series. Installed in a rack near the valve connections, the board converts low-level command signals into controlled current for hydraulic solenoids, allowing a PLC to regulate pressure or flow without mechanical feedback devices at the valve. The module matches the electrical requirements of industrial proportional valves to the control power commonly available in machine panels, simplifying motion and force-control applications.

The electronics operate from a 24 VDC supply and draw up to 2.5 A, so cabinet fusing must accommodate peak inrush and the steady load. Internal power dissipation is limited to 60 W, which must be considered when arranging airflow or heat sinks for multiple cards in a narrow rack. The output stage can deliver a regulated coil current of 3.7 A with a corresponding solenoid power of 50 W, enabling direct control of medium-sized proportional valves. A 10 V reference and a 1 kΩ command potentiometer input establish the full-stroke signal range. A 7.8 kHz chopper operating at 10.8 V RMS helps minimize coil hysteresis and acoustic noise during valve operation.

The board measures 160 mm in length and 100 mm in width, matching the Eurocard format, while the front plate spans 7 TE for consistent slot spacing inside the enclosure. All field wiring terminates on a DIN 41612-F32 connector, allowing the wiring assembly to disconnect from the card through one interface. The enable input requires at least 8.5 VDC before the power stage activates, and a fault causes the error line to source 100 mA to notify the controller. The card has a mass of 0.36 kg, which places a relatively low mechanical load on card guides in machinery exposed to vibration.