Product Description:

The VT-VRPA2-537-10/V0/RTP is an electric amplifier card manufactured by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. The board is specified as a master card, meaning it occupies the control slot that supplies ramp generation and zero-point trimming to proportional directional, pressure, or throttle valves. In industrial automation racks, the card converts a ±10 V command into a regulated solenoid current, letting hydraulic actuators follow electronic set points with repeatable speed profiles. Its plug-in format allows quick installation and removal through a DIN 41612 backplane without rewiring the field side.

Physical and electrical parameters support that role. The Eurocard outline measures 100 × 160 mm, and the front panel spans 7 TE, so the module fits standard 19-inch subracks. Internal circuits draw a stabilized bus of 24 V DC, and the card itself needs only 2.5 A under full excitation. Dissipation stays within 60 W, allowing convection cooling inside a vented cabinet. A signal source resistance of 10 kΩ is recommended for the ±10 V input, while the potentiometer supply on the faceplate provides ±10 V for external set-point dials. The zero-point potentiometer can shift the output window by ±10% to compensate for valve tolerances.

On the output side, the amplifier delivers up to 3.7 A per channel, and the solenoid load must not exceed 50 VA to keep the driver transistors within safe thermal limits. Acceleration and deceleration of the hydraulic element are determined by the adjustable ramp generator; settings range from the fastest 0.05 s to a smooth 5 s, letting the machine builder eliminate pressure shocks or tune response time. The DIN 41612-F32 connector carries power, command, and feedback lines so wiring remains localized at the rack, and the master-card design leaves slave amplifier slots free for additional axes.