Product Description:

The VT-VRPA1-100-1X/V0/0 is a valve amplifier module manufactured by Bosch Rexroth Indramat and supplied within the VT-VRPA Electric Amplifiers series. It is designed to drive a single proportional solenoid on a pilot-operated pressure control valve, converting an input command into controlled coil current. In industrial automation, the board interfaces with higher-level controllers to modulate hydraulic pressure, providing closed-loop position feedback and stable process control.

The board operates from 24 VDC, a common control supply that allows direct connection to machine power buses without additional converters. Input and output are processed as analog signals, so the device accepts a continuous voltage command and returns proportional position data to the host controller. A backplane connector with 32 pins provides separate terminals for supply, command, monitor, and feedback lines, and the pin count also reserves contacts for fault monitoring lines. Position accuracy comes from an internal circuit that closes the loop on the spool's position feedback sensor, ensuring current is trimmed until the demanded displacement is reached. The amplifier is matched electrically and dynamically to the proportional pilot valve type DBETR-1X, so no scaling resistors or gain adjustments are required when that valve is installed.

For cabinet integration, the module slides into a 19 in rack, where it locks to a ground rail and mates with the card cage backplane. A dedicated channel drives 1 solenoid, enabling use in axes that need only single-coil actuation. The front edge carries a form-D connector for local test points, allowing command signals to be applied without removing the board. When a card frame is used, the card holder mount secures the PCB against vibration and keeps the board aligned with the backplane connection during operation. The module functions as a valve amplifier for proportional hydraulic control in rack-based systems.