VT-VPRAS1-527-10/V0 PL6-RKP

The VT-VPRAS1-527-10/V0 PL6-RKP is an electronic amplifier card developed by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. Designed for pilot-stage proportional valves, the module converts low-level command and feedback signals into controlled solenoid current so that hydraulic axes follow electronic motion profiles in industrial automation equipment. It fits into 32-pin Eurocard racks and serves as a controller for mobile or stationary hydraulic machines.

The amplifier connects to the control cabinet backplane through a DIN 41 612-F32 plug and is energized from a nominal bus of 24 V DC. Under rated conditions, it draws up to 37 W and uses an internal clocked current regulator as its output stage, providing 2 kHz carrier pulses that are averaged by the hydraulic inductance. The setpoint input presents a high-impedance load of 100 kΩ, while the actual-value channel is terminated at 20 kΩ to minimize sensor loading. Proportional position loops operate with PI action, and the dedicated ±15 V transducer rail powers LVDT or potentiometric feedback devices. A 10 kΩ setpoint potentiometer can be wired locally, and a mechanical trimmer provides a zero adjustment range of ±5% at the front panel.

Energy storage for pulse smoothing is provided by a 4700 µF / 63 V DC capacitor that limits ripple on the solenoid line. Continuous electronics operation requires only 1.5 A, leaving reserve capacity for coil actuation. The solenoid output can supply a maximum of 2.7 A / 25 W to a proportional valve coil. Diagnostic circuitry delivers a +24 V / 100 mA fault signal that indicates wire breaks, overcurrent, or supply loss to a PLC input. The clocked regulator maintains stable valve positioning throughout the command range, while the current monitoring circuit protects the output stage against thermal overload.