VT-VRPA2-1-1X/V0/T1

The VT-VRPA2-1-1X/V0/T1 is an electric amplifier card produced by Bosch Rexroth Indramat within the VT-VRPA Electric Amplifiers series. As a plug-in printed circuit module, it conditions low-level control signals and drives proportional valve solenoids in closed-loop hydraulic axes. The board integrates easily into centralized automation because it occupies a single slot in a standardized 19-inch rack and interfaces with external controllers through an analog command path.

The module is energized by a regulated control supply of 24 VDC, ensuring stable operation of its internal logic and output stages. Incoming motion references are accepted through a bipolar ±10 V command input, so common PLC or motion card outputs can be wired directly without scaling hardware. Two independent output stages support valves with 2 proportional solenoids, allowing the amplifier to modulate flow or pressure in both directions. One selectable ramp generator provides 1 acceleration and deceleration time setting, preventing hydraulic shock by smoothing command changes before they reach the valve. Four discrete call-up channels provide 4 stored parameter groups, permitting rapid switching between machine recipes when different process characteristics are required.

Signal exchange is routed through a 48-pin connector plug, Form F, providing a compact, keyed interface that matches standard Rexroth backplanes. The board can be installed in a card holder or 19-inch rack, allowing removal without disturbing adjacent electronics. Internal traces support an analog connectivity scheme, maintaining continuous voltage feedback from the valve for closed-loop correction. The multilayer printed circuit board carries the drive, filter, and reference networks on controlled-impedance copper paths. Position-sensor wiring supports real-time position feedback, allowing the amplifier to compare the measured valve position with the command signal and correct deviations during operation.