VT-VRRA1-537-20/V0 Bosch Rexroth Indramat
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MPN: 811405061
The Bosch Rexroth Indramat VT-VRRA1-537-20/V0 is part of the VT-VRPA Electric Amplifiers series and operates at a supply voltage of 24 V DC with a typical power consumption of 55 W. It features command and enable input resistances of 100 kΩ and an actual value input resistance of 20 kΩ. This amplifier weighs 0.37 kg and uses a DIN 41612-F32 connector.
Internal Product Review
The VT-VRRA1-537-20/V0 is an electric amplifier from Bosch Rexroth Indramat built for precise valve control with a 24 V DC supply. A 100 kΩ command input resistance paired with a ±15 V position transducer supply supports stable signal handling and accurate feedback integration. Typical power consumption of 55 W adds efficiency, making this amplifier a strong choice for dependable electrohydraulic performance.
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Product Description:
The VT-VRRA1-537-20/V0 is an electric amplifier card produced by Bosch Rexroth Indramat as part of the VT-VRPA Electric Amplifiers series. It occupies a 7 TE-wide front-panel position and connects through a DIN 41612-F32 plug, allowing straightforward installation in 19-inch automation racks. Within an industrial control loop, the card amplifies command, feedback, and enable signals. It also performs zero-point trimming and supplies controlled current to valve solenoids, linking low-level control electronics with actively regulated actuators in factory machinery.
The board operates from a 24 V DC supply rail. Under maximum loading conditions, it draws 2.7 A and has a typical internal power dissipation of 55 W, so the cabinet must provide sufficient cooling. The actual-value signal input has a resistance of 20 kΩ, which limits current flow from connected transducers. The command channel presents an input resistance of 100 kΩ, preventing excessive loading of the controller’s analog source. The enable line has the same impedance and recognizes an active signal when the voltage reaches 8.5 V, allowing simple on-and-off control. A front-panel trimmer provides zero-point adjustment of ±5% for correcting signal offsets. An error-output transistor can sink up to 100 mA to report faults to a higher-level control system.
The amplifier supplies connected sensors from a regulated ±15 V rail. It also provides a separate ±10 V / 10 mA supply for external potentiometers used to set manual command values. The power stage can deliver 3.7 A / 60 VA to a proportional valve solenoid without saturation. The required position cable uses four 0.5 mm² conductors to carry low-noise feedback signals. Field connections are located on the backplane, eliminating the need for terminal blocks. The module has a mass of 0.37 kg, minimizing the mechanical load placed on the rack during insertion and removal. The transducer, potentiometer, and valve circuits share a common reference rail that maintains a stable signal ground.
