MRMA1-1 Rexroth

Product Dimensions：

The MRMA1-1 is a compact, DIN-rail mounted signal conditioning module. Its main function is to adapt non-standard or varying analog signals into a format that a proportional valve amplifier or a PLC can interpret without loss of resolution. This module often acts as a bridge in systems where the controller output (such as a 0-10V signal) needs to be converted or scaled to match the specific input requirements of a Rexroth proportional valve. The unit is designed with a rugged industrial housing that protects the internal precision electronics from electromagnetic interference and environmental contaminants.

Product Parameters

• Supply Voltage: Typically $24 \text{ VDC}$ (operating range $18 \text{ V}$ to $35 \text{ VDC}$), standard for industrial control cabinets.

• Input Signal Types: Supports standard analog inputs including $0 \text{ to } \pm 10 \text{ V}$ or $0/4 \text{ to } 20 \text{ mA}$ through configurable jumpers or terminals.

• Output Signal: Provides a cleaned, buffered, and scaled analog output to match high-impedance valve amplifiers.

• Accuracy: High linearity with minimal drift, typically $<$ 0.1% of the full-scale range.

• Mounting Type: Snap-on mounting for $35 \text{ mm}$ DIN rails (EN 60715).

• Connection Method: Screw terminals for secure field wiring, accommodating wire sizes up to $2.5 \text{ mm}^2$.

• Temperature Range: $0\text{°C}$ to $50\text{°C}$ ($32\text{°F}$ to $122\text{°F}$) for standard operation.

• Potentiometers: Features front-facing "Zero" and "Gain" adjustment pots for fine-tuning the signal offset and span.

Product Advantages

A major advantage of the MRMA1-1 is its Signal Isolation and Buffering. It prevents ground loops and electrical noise from traveling between the main controller and the hydraulic actuators, which is vital for preventing "jitter" in sensitive hydraulic positioning. The Modular Versatility allows it to be integrated into almost any existing Rexroth system, making it an excellent choice for retrofitting older machinery with modern electronics.

The Precision Calibration capability via the onboard potentiometers means that technicians can calibrate the physical movement of a valve directly at the module, compensating for mechanical wear or sensor drift without needing to reprogram the central PLC. Furthermore, its Compact Footprint allows for high-density installation in control cabinets where space is limited.

Important Considerations and Precautions

When installing the MRMA1-1, it is essential to observe Correct Polarity for the power supply; while many Rexroth modules have reverse-polarity protection, consistent wiring practices prevent upstream fuse failures. Signal Cable Shielding is another critical factor; always use twisted-pair shielded cables for analog signals and ground the shield at only one end (usually the cabinet side) to avoid creating ground loops.

Technicians should be cautious during Calibration; small turns of the gain and zero potentiometers can result in significant changes in valve behavior, so adjustments should only be made while monitoring the system's physical output. Additionally, ensure that the Load Impedance of the receiving device matches the module's output specifications to avoid signal clipping or inaccuracy. Finally, avoid installing the module directly adjacent to high-heat components like large power resistors or unventilated motor drives to ensure thermal stability.

Product Applications

The Rexroth MRMA1-1 is found in a variety of industries where hydraulic precision is mandatory.

• Metal Forming Presses: Matching the speed and pressure setpoints for proportional valves in large hydraulic presses.

• Plastic Injection Molding: Ensuring the precise flow control of hydraulic fluid during the mold-closing and injection phases.

• Civil Engineering: Used in the control of large hydraulic gates and sluices in dam or lock systems.

• Paper and Wood Processing: Managing the synchronized movement of hydraulic cylinders in heavy-duty pressing and cutting machinery.

• Aerospace Test Stands: Providing accurate signal interfacing for high-response servo-hydraulic actuators used in structural testing.

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