Product Description:

The VT-VPRAS1-527-10/V0 PL6-RKP is an electric amplifier produced by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. In an automation cell, it accepts a voltage reference from a motion controller and conditions that signal so a hydraulic valve solenoid receives precisely metered current, letting the valve spool track the commanded position. Additional circuitry includes a 4700 µF smoothing capacitor to stabilize the internal DC link, a 10 kΩ setpoint potentiometer for manual trim, a ±5% zero-adjustment range, a 20 kΩ actual-signal measurement impedance for feedback monitoring, and a +24 V / 100 mA fault output that reports error states to the machine control system.

The amplifier operates from a nominal supply of 24 V DC, and under that supply it draws a steady 1.5 A to support the internal logic, control loops, and power stage. Overall power consumption is limited to 37 W, which helps estimate heat dissipation inside the enclosure. The output stage is a clocked current regulator, so solenoid energy is delivered through high-frequency switching that reduces coil heating and improves response. The control circuit uses PI action, where proportional gain corrects immediate error and integral gain removes steady-state offset during positioning.

The signal path begins with a setpoint circuit that has an input impedance of 100 kΩ, which helps prevent loading of upstream analog sources. A dedicated sensor supply is available at ±15 V for external position transducers, helping keep the feedback loop stable and isolated from noise in the rest of the system. When driving the connected actuator, the amplifier can deliver up to 2.7 A / 25 W maximum to the valve solenoid, matching common proportional coil requirements. Field wiring terminates on a DIN 41 612-F32 connector, which supports straightforward installation and replacement.