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EPRO MMS6220
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EPRO MMS3120/022-000
EPRO MMS3120/022-000
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EPRO MMS6312
EPRO MMS6312

EPRO MMS6220

Product Name​
Dual-Channel Shaft Eccentricity Monitor
Product Introduction​
EPRO MMS6220 is a turbine protection module designed for continuous radial shaft eccentricity monitoring. It evaluates relative shaft displacement from two independent eddy-current measuring chains and provides peak-to-peak, minimum, and maximum eccentricity values for steam, gas, and hydro turbine systems.
Category:
Description
Technical Specifications​
Input channels: 2 independent eddy-current channels
Input impedance: ≥100 kΩ
Input voltage range: -1 to -23 V DC
Signal frequency range: 0.017 to 70 Hz, equal to 1.02 to 4200 rpm
Minimum signal voltage: 0 to 400 mV peak
Maximum signal voltage: 0 to 8000 mV peak
Sensor supply: nominal -26.7 V DC
Sensor supply current: 20 mA typical, 35 mA maximum
Measuring range multiplier: 1.000 to 4.999
Logic control inputs: 24 V DC, input resistance ≥30 kΩ
Key pulse input: 1 pulse per revolution, 24 V logic, minimum 10 µs, input resistance ≥30 kΩ
Auxiliary voltage inputs: 2 channels, 0–10 V, impedance ≥100 kΩ, 10-bit resolution
Communication: RS232 for configuration, RS485 for fieldbus integration in supported configurations
Power supply: 24 V DC, 18–31.2 V DC operating range
Operating temperature: 0 °C to +65 °C
Housing material: industrial PCB with metal front plate
Functional Features​
Galvanically isolated sensor supplies, open-circuit and short-circuit protection, adjustable multiplier for run-up and run-down conditions, key-phase synchronization, warning and danger alarm processing, and full self-diagnostic functions.
Working Principle​
Eddy-current probes generate a DC gap voltage and AC displacement signal proportional to shaft surface position. MMS6220 demodulates the signal, applies the range multiplier, calculates eccentricity peak-to-peak values, and compares results with alarm limits. Key-pulse input provides rotational reference for synchronization.
Application Scenarios​
Steam turbine eccentricity supervision, gas turbine shaft position monitoring, hydro generator radial displacement protection, compressor rotor monitoring, and turbomachinery commissioning.
Structural Characteristics​
Plug-in MMS-system module, differential amplifier stages, isolated sensor excitation, digital signal evaluation section, front-panel status indicators, and rack-backplane communication interface.
Installation Requirements​
Install in the designated EPRO MMS rack slot. Connect PR642x probes through CON-series signal conditioners according to system drawing. Set sensor gap voltage before power-up. Ground the shield at the module end. Configure alarm values through RS232 using approved EPRO configuration software.
Usage Precautions​
Validate probe linear range before operation. Do not exceed -23 V input on measuring channels. Check key-pulse polarity and minimum pulse width. Recheck multiplier settings after rotor thermal changes. Prevent moisture ingress in rack enclosure.
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