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EPRO MMS6312
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EPRO MMS6823R
EPRO MMS6823R

EPRO MMS6312

Product Name​
Dual-Channel Rotational Speed Monitor
Product Introduction​
EPRO MMS6312 is a high-precision speed monitoring module within the MMS6000 machinery protection platform. It measures rotational speed, standstill, key-phase, direction, and differential speed from pulse or eddy-current sensors for turbines, compressors, pumps, and motors.
Category:
Description
Technical Specifications​
Input channels: 2 independent differential inputs
Input resistance: >100 kΩ
Input voltage range: 0 to -27.3 V DC
Maximum input voltage: 0 to 30 V
Frequency range: 0–20,000 Hz
Sensor compatibility: eddy-current probes PR6422 to PR6425; pulse sensors PR9376 and PR6453
Supply voltage: 18–31.2 V DC with redundant input option
Power consumption: maximum 6 W, approximately 250 mA at 24 V DC
Outputs: galvanically separated current outputs and alarm relays according to configuration
Communication: RS232 for local configuration, RS485 for MMS system bus and diagnostics
Dimensions: 30 mm width, 128.4 mm height, 160 mm depth, 6 TE rack size
Weight: approximately 320 g
Module protection: IP00; front plate IP21
Operating temperature: 0 °C to +65 °C
Storage temperature: -30 °C to +85 °C
Humidity: 5–95 percent non-condensing
Vibration resistance: 0.15 mm at 10–55 Hz, 16.6 m/s² at 55–150 Hz
Shock resistance: 98 m/s² for 16 ms
Functional Features​
Dual independent speed channels, automatic or manual trigger adjustment, sensor open/short detection, self-diagnostics, redundant power input, hot-swap capability in supported racks, and integration with MMS6850 analysis system.
Working Principle​
The sensor produces pulses proportional to shaft rotation or key-phase position. MMS6312 counts pulses, measures frequency, converts frequency into speed values, evaluates standstill and direction, and activates analog outputs or relay alarms when limits are exceeded.
Application Scenarios​
Turbine overspeed protection, compressor surge-control speed feedback, boiler feed pump monitoring, motor speed and direction supervision, and critical rotating-machine protection systems.
Structural Characteristics​
6 TE plug-in module, differential input stage, isolated power section, microprocessor evaluation circuit, RS232/RS485 interface, front LEDs for status and fault indication.
Installation Requirements​
Mount in 19-inch MMS6000 rack with redundant 24 V DC supply. Connect pulse or eddy sensors to differential inputs with shielded cable. Terminate RS485 bus at both ends. Use approved configuration software for trigger level, alarm setpoints, and channel mode.
Usage Precautions​
Match sensor output amplitude with trigger setting. Avoid sensor supply voltage above specified maximum. Verify RS485 termination to prevent signal reflection. Keep module ventilation clear and inspect self-diagnostic logs during maintenance.
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