EPRO MMS6312

Description

Technical Specifications

• Input Channels: 2 independent galvanically isolated channels
• Input A: Displacement sensor (Eddy Current, e.g., PR642x series)
• Input B: Seismic/velocity sensor (e.g., PR9268 series)
• Input Voltage Range: 0 to ±27.3 VDC
• Input Frequency Range: 0–2000 Hz (corresponding to up to 65,535 RPM)
• Analog Output: 0/4–20 mA proportional to measured vibration value
• Pulse Output: 0–20 kHz TTL per channel
• Power Supply: Redundant dual power inputs for continuous operation
• Operating Temperature: -20°C to +65°C
• Front Panel Indicators: Green/yellow LEDs for channel status and limit exceedance
• Relay Outputs: Independent Alert and Danger relays with configurable delay times

Functional Features

• Absolute shaft vibration calculation via vector combination of displacement and seismic signals
• Continuous wide-range frequency monitoring for full rotational speed range
• Built-in sensor integrity checks and self-diagnostics to prevent false trips
• Buffered raw signals available via SMB connectors for external vibration analysis
• Compatible with standard eddy current and seismic vibration sensors
• Hot-swappable design for replacement during operation
• Password-protected operation levels for parameter configuration

Application Scenarios

• Critical rotating machinery absolute vibration monitoring
• Steam, gas, and hydro turbine shaft vibration protection
• Compressor, generator, and large pump condition monitoring
• Turbine mechanical protection systems
• Power generation, petrochemical, and metallurgical industries
• Integration with DCS, PLC, and machinery diagnostic systems

Working Principle The module simultaneously acquires relative shaft displacement signals from eddy current sensors and casing vibration signals from seismic sensors. It performs vector summation of the two signals to calculate absolute shaft vibration relative to free space. The processed signals are compared against configurable alarm thresholds, with corresponding relay and analog outputs generated for system integration.

Installation Requirements

• Mount in MMS 6000 series rack chassis
• Connect eddy current sensors to Input A and seismic sensors to Input B
• Use shielded cables for all sensor and signal connections
• Ensure proper grounding and electromagnetic interference shielding
• Verify power supply voltage matches module specifications

Operating Notes

• Perform sensor calibration and module configuration before commissioning
• Regularly check status indicators for sensor and module health
• Maintain clean and dry environmental conditions for reliable operation
• Use only EPRO-compatible sensors and accessories for optimal performance