VT-VRPA1-100-1X/V0/0

The VT-VRPA1-100-1X/V0/0 is a valve amplifier card manufactured by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. In a hydraulic automation circuit, the board converts low-level command signals from a PLC into controlled coil current so that a proportional pressure valve can follow the requested setpoint. This interface allows analog electronics to drive hydraulic components with the precision needed for closed-loop motion and pressure control tasks.

Operating power is taken from a 24 VDC supply, which feeds the internal regulators and supports the current delivered to the valve coil. The card connects to the control rack through a 32-pin edge connector, so wiring for inputs, outputs, and diagnostics is arranged in a single plug-in interface. Command and feedback channels are processed as analog signals, permitting simple summing, ramp, and limit functions without digital conversion delays. The amplifier accepts position feedback from the valve spool, enabling it to compare the actual displacement with the reference signal and correct errors in real time. Its gain and dither settings are configured for a DBETR-1X proportional pressure valve, supporting stable operation when the matched valve is installed.

The board uses a card-holder mount, allowing it to slide into a guide rail and lock securely within the control rack. On the front panel, a D-sub connector carries external test points and enable lines, keeping service connections separate from the main power interface. The assembly fits a 19-inch rack, where it can share backplane power and bus connections with other Rexroth motion-control cards inside a standard enclosure. Because the drive channel energizes only one coil winding, the design supports a single-solenoid proportional valve without requiring polarity-reversal circuitry. The plug-in format also keeps the adjustment controls and signal access points available from the front of the rack while the primary electrical connections remain organized at the rear.