VT-VRPD-2-21/V0/0-0-1 Bosch Rexroth Indramat
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MPN: R901066987
The Bosch Rexroth Indramat VT-VRPD-2-21/V0/0-0-1 is part of the VT-VRPA Electric Amplifiers series and supports analog input with a differential topology. It features a fixed baud rate of 57600, a RS232 serial interface, and 16 selectable setpoints. This amplifier is compatible with 4WRE 6/10 valve sizes and has a binary high level of 24 V.
Internal Product Review
The VT-VRPD-2-21/V0/0-0-1 is an electric amplifier for Bosch Rexroth 4WRE 6/10 valve applications, with a differential analog input topology for clean signal handling. RS232 communication at 57600 baud supports straightforward setup and consistent parameter access during commissioning. Selectable setpoints up to 16 make this unit a highly capable choice for precise hydraulic control.
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Product Description:
The VT-VRPD-2-21/V0/0-0-1 is an electric amplifier card produced by Bosch Rexroth Indramat for the VT-VRPA Electric Amplifiers series. Mounted on a standardized Eurocard, it converts analog or binary setpoints into current-regulated outputs that actuate proportional directional valves in hydraulic automation equipment. By translating controller commands into precise coil excitation, the board links machine PLCs with 4WRE valve stages used for flow and pressure control. This arrangement allows the card to regulate hydraulic valve movement according to signals received from the machine controller.
The analog command channel uses a differential topology, so the amplifier measures the voltage between two inputs rather than measuring each input relative to ground, which improves noise immunity. A binary enable level of 24 V is accepted on pin d18, while additional logic such as DI6 can be monitored for status functions. Parameter downloads occur at a fixed rate of 57,600 baud through the serial connector, and a 120 Ω bus terminator is available for the ends of communication lines. Internal reference generation supplies +10 V to external potentiometers, supporting analog command input and adjustment circuits. The separated signal and reference paths help prevent switching activity from interfering with low-level command voltages.
Up to 16 selectable setpoints can be stored, allowing the controller to switch among predefined flow curves without reprogramming the card. The negative reference rail is maintained at -10 V to balance the positive reference and support actuator symmetry. Host communication relies on the RS-232 interface, which uses the Rx1-Tx6-GND5 pinout for serial communication. Drive current for the valve coil is routed through pin b26, while the supply voltage enters through pin z30 to separate power paths from signal tracks. Command feedback leaves the card through pin d30, allowing external monitoring of the actual solenoid current applied to 4WRE 6 or 4WRE 10 valve sizes. Two front-panel test jacks provide access for oscilloscope probes during setup and diagnostics. The DI6 binary input provides an additional safety interlock for the connected hydraulic control system.
