Product Description:

The VT-VRPD-2-2X/V0/0-0-1 is an electric amplifier module that belongs to the VT-VRPA Electric Amplifiers series produced by Bosch Rexroth Indramat. It conditions command and feedback signals so proportional directional valves receive accurate drive currents during closed-loop position or pressure control. By translating digital setpoints into precise analog reference levels, the unit forms an interface between a machine controller and proportional valves in industrial automation racks. This arrangement helps the hydraulic stage follow requested operating changes with stable and repeatable response.

The command path starts at the Command Output Pin d30, which delivers the regulated current to valves such as 4WRE 6 or 4WRE 10. Control logic is enabled through the Enable Input Pin d18, and a high state on this contact activates the output drivers once the digital high level reaches 24 V. Parameterization and diagnostics occur over an RS232 serial interface operating at a fixed baud rate of 57600 baud. That serial link allows setup changes and status checks without altering the valve wiring. When several amplifiers share a local backplane, signal integrity is maintained by local bus termination resistors of 2 × 120 Ω mounted on the board. For power distribution, the supply enters the module at pin z30, while transducer feedback is accepted through a 4-pole Pg7-G5W1F connector. The circuitry supports both 4/2 and 4/3 proportional valve functions, allowing directional or center-closed flow profiles to be selected by software.

The digital processing section stores up to 16 independent setpoints that can be recalled through fieldbus commands, allowing rapid recipe changes without rewiring. System readiness is indicated on the Ready Output Pin d22, which switches once reference voltages stabilize at −10 V and +10 V. These symmetrical reference rails provide the full span for bipolar command values. This allows the controller to request positive or negative valve displacement with equal resolution during motion or pressure control.