Description
EPRO MMS6120
Technical Specifications Two galvanically isolated independent input channels; compatible with electrodynamic velocity vibration sensors; standard frequency range 10 Hz to 1000 Hz; measuring range adjustable from 0 to 100 mm/s; 4-20mA and 0-10V analog output per channel; SPDT programmable alarm relay; RS232 front configuration port, RS485 rear bus; single-slot rack hot swappable module.
Functional Features Dual-channel parallel vibration measurement; galvanic isolation between sensor input and internal circuit; programmable high and high-high alarm thresholds with adjustable hysteresis; sensor cable break and short circuit fault diagnosis; analog measured value output to DCS/PLC; relay contact trip or alarm output; front panel LED channel and alarm status indicators; module hardware self-test on power-up.
Application Scenarios Steam turbine bearing vibration protection; gas turbine machinery health monitoring; centrifugal compressor safety monitoring; large pump and fan vibration protection; gearbox condition monitoring in power plant and petrochemical plant.
Performance Parameters Operating ambient temperature -20℃ to +70℃; storage temperature -40℃ to +85℃; relative humidity 5% to 95%, no condensation; measurement precision meets API670 rotating machinery protection specification.
Material Composition Aluminum alloy module front panel; multi-layer high precision measurement PCB; high-speed analog sampling circuit; embedded microprocessor chip; signal surge suppression components; electromechanical alarm relays; gold-plated backplane edge connectors; brass nickel-plated signal terminals.
Structural Characteristics Single slot plug-in rack module; front panel equipped with LED indicators, sensor BNC input connectors and RS232 service port; rear gold finger connector connects to MMS6000 rack backplane; internal circuit separated for analog sensor signal and digital processing circuit.
Working Principle Vibration velocity sensor mounted on bearing housing converts mechanical vibration movement into analog electrical signal. MMS6120 module receives sensor signal, filters and amplifies the signal, converts analog signal into digital value. Internal processor compares measured vibration value with preset alarm thresholds. When vibration exceeds threshold, relay contact changes state for alarm or machine trip. Measured vibration value transmits via 4-20mA analog channel to plant control system.
Installation Requirements Power off MMS6000 rack before module insertion. Insert MMS6120 module into rack slot and lock front latch. Connect vibration velocity sensors via shielded coaxial cable. Configure measuring range and alarm threshold through front port configuration software. Complete cabinet protective earthing and perform sensor loop test.
Usage Notes Use shielded low-capacitance coaxial cable for vibration sensor wiring. Do not hot swap module during turbine operation unless rack supports hot swap. Backup module configuration parameters before replacement. Inspect sensor cable insulation resistance periodically.
