VT-VRPA2-527-10/V0/RTS

Bosch Rexroth Indramat’s VT-VRPA2-527-10/V0/RTS is an electronic amplifier card from the VT-VRPA Electric Amplifiers series. The Eurocard-sized module converts low-level command voltages into controlled coil currents for proportional directional valves used in industrial hydraulic systems. When installed in a 19-inch rack, it conditions reference signals, drives the valve solenoids, and processes feedback between a motion controller and the hydraulic valve. Its analog circuitry supports real-time signal processing without the latency associated with digital conversion.

The board operates from a machine bus supplying 24 V DC. Under nominal load, it draws approximately 1.5 A, while power dissipation remains within a limit of 35 W. Two internal output stages regulate current according to the signal received by the analog control circuitry. The built-in actual-value oscillator generates a carrier of 10.2 V RMS at 7.8 kHz, supporting demodulation of the LVDT signal from the connected valve. Supply, set-point, and feedback connections are routed through a DIN 41612-F32 plug, which supports installation in compatible Rexroth hydraulic racks. A 1 kΩ front-panel potentiometer provides access for calibration adjustments.

The amplifier can deliver up to 2.7 A per coil, matching the magnetic requirements of compatible 4WRP 6 series proportional valves. Its command input accepts a bipolar ±10 V signal for bidirectional valve control. Fine alignment around the neutral position is available through a zero-shift adjustment range of ±10%. The printed circuit follows the Eurocard outline, allowing direct insertion into RTS rail guides without special mounting hardware. The card regulates solenoid current in response to the command input while using valve feedback to maintain stable spool positioning. This arrangement supports controlled hydraulic motion in positioning systems that require responsive analog operation.