VT-MRMA1-1-11/V0/0 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat VT-MRMA1-1-11/V0/0 is part of the VT-VSPA Proportional Amplifiers series. This amplifier operates with a 24 VDC input and has a maximum power consumption of 24 VA, featuring a protection class of IP20. It offers a command input resistance of 50 kiloohms minimum and an output stage current up to 1.85 A, with dimensions of 40 by 79 by 85.5 mm and a weight of 0.14 kg.
Internal Product Review
The VT-MRMA1-1-11/V0/0 is a proportional amplifier tuned for stable 24 VDC operation and a 1.85 A max output stage current. IP20 protection and a 5.6 kHz oscillator support clean integration and dependable signal control, making this unit a strong choice for precise amplification.
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Product Description:
The VT-MRMA1-1-11/V0/0 is a plug-in proportional amplifier card manufactured by Bosch Rexroth Indramat for the VT-VSPA Proportional Amplifiers series. Installed in hydraulic control racks, the module converts low-level command voltages from a PLC into controlled solenoid current that positions directional or pressure valves with repeatable accuracy. Its housing measures 40 × 79 × 85.5 mm, and its compact format supports installation in densely arranged control cabinets. The card weighs 0.14 kg, which minimizes the load placed on the rack assembly. Its IP20 enclosure protects against accidental contact with internal electrical components when the card is installed inside a suitable cabinet. Integrated signal conditioning, pulse-width modulation, and enable supervision allow the board to control hydraulic valves in presses, machine tools, and automated assembly lines.
The amplifier receives power from a nominal 24 VDC supply rail. Internal monitoring prevents operation when the supply voltage drops below 18 V, protecting the output stage from unstable operation during an undervoltage condition. The output is enabled after the applicable control voltage reaches at least 8.5 V. Shutdown occurs if that voltage falls below 6.5 V, providing a clear switching threshold between enabled and disabled states. The circuitry withstands transient surges up to 35 V, helping protect internal components from short voltage spikes in the field wiring. At maximum load, the card draws 24 VA and no more than 2 A from the source. The command input has a minimum resistance of 50 kΩ, which limits the electrical load placed on an upstream analog output card.
The pulse-width modulation oscillator operates at 5.6 kHz with a tolerance of ±10 percent. It produces a 2 V carrier signal and provides a 10 mA gate drive for the switching transistors. The output stage delivers up to 1.85 A of regulated current to the connected valve coil, allowing proportional control of the hydraulic actuator. Continuous operation is permitted at ambient temperatures up to 50 °C without thermal derating. The board combines its signal-processing and power-output functions within a plug-in format that connects directly to a compatible hydraulic control rack. Enable supervision prevents uncontrolled output during low-voltage conditions, while the regulated current stage maintains the commanded valve position as the hydraulic load changes.
