Product Description:

The VT-VSPA 1-508-10-V0-RTP is a single-channel proportional amplifier card produced by Bosch Rexroth Indramat within the VT-VSPA Proportional Amplifiers series. Installed in a hydraulic control rack, the board converts low-level command voltages from a PLC into controlled coil current for proportional directional or pressure valves. By generating smooth current ramps rather than step changes, the module lets machine builders adjust valve spool position and oil flow with minimal overshoot, supporting repeatable motion, clamping, or pressure regulation tasks in automated presses, injection machines, and transfer lines.

Its Eurocard footprint has a board length of 160 mm and a width of 100 mm, so it fits standard 3U subracks without spacers. A rear DIN plug coded DIN 41612-F32 supplies I/O and power through a single back-plane connector. The amplifier operates from a nominal supply of 24 VDC; at this voltage, its internal circuits draw up to 1.25 A, which corresponds to a maximum consumption of 30 VA. These limits help size control power supplies and cabinet heat dissipation. The 7 TE front plate carries test points and trim potentiometers, allowing adjustment while keeping the card locked into the rack.

Command changes are filtered by adjustable ramp generators that extend from a minimum of 0.05 s up to 5 s, letting the user tune acceleration and deceleration rates to match cylinder inertia. The output stage can deliver a continuous coil current of 0.8 A, matching typical proportional solenoid ratings while leaving headroom below the board’s electrical limit. An auxiliary +10 V, 20 mA reference supply feeds external potentiometers, and a 6 V ramp-off threshold ensures the ramp circuit resets cleanly when the command input drops. Valve response is characterized by a 50 ms setting time, and the 0.32 kg card mass supports installation in densely packed cabinets.