Rexroth MRMA1-1 Drive Module

Description

Rexroth MRMA1-1 Drive Module

Product Dimensions：

The Rexroth VT-MRMA1-1 is a high-performance analog amplifier module specifically designed to control proportional pressure valves with electrical position feedback. It is part of the modular analog series that provides precise solenoid current control to ensure stable hydraulic pressure modulation.

Product Detailed Description

The VT-MRMA1-1 is a DIN-rail mounted module that acts as a closed-loop controller. It compares an external command value (desired pressure) with the actual pressure value from the valve’s position transducer. By processing these signals, it drives the valve’s proportional solenoid to achieve the target pressure with high accuracy and repeatability.

Technical Parameters

Product Advantages

• Modular Analog Design: Easy to integrate into standard control cabinets and simplified troubleshooting compared to complex digital bus systems.
• Integrated Diagnostics: Features LED indicators on the front panel: Green (Ready for operation), Yellow (Enable active), and Red (Fault detection, such as cable breaks).
• Precise Control: Features separate potentiometers for adjusting zero point, amplitude (gain), and ramp times, allowing for fine-tuning of the hydraulic response.
• Safety Stops: Includes “electronic limit stops” that prevent the valve from hitting mechanical boundaries, extending the lifespan of the hydraulic components.
• Robust Inputs: Differential analog inputs provide high noise immunity against electromagnetic interference (EMI).

Important Considerations (Precautions)

• Wiring Integrity: The electronic stops and “Ready” signal are only effective if the position sensor and solenoid motor are correctly wired. Inversion of lines can lead to positive feedback loops.
• Calibration: During commissioning, use the integrated measuring sockets (w, x, t) to verify that the command signal matches the actual physical position/pressure of the valve.
• Power Supply: Ensure the 24V supply is stable. While it accepts a wide range, voltage drops below 18V will deactivate the output stage as a safety precaution.
• Cable Selection: Use shielded cables for all analog signals and the solenoid output to prevent interference with nearby sensitive electronics.

Product Applications

The VT-MRMA1-1 is typically found in industrial hydraulic systems requiring precise pressure regulation:

• Plastic Injection Molding: Controlling the clamping and injection pressure phases.
• Hydraulic Presses: Maintaining consistent force during forming or stamping operations.
• Machine Tools: Regulating tool clamping pressure or auxiliary hydraulic functions.
• Testing Rigs: Providing high-accuracy pressure control for component durability testing.

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