Epro Emerson MMS 6220 Dual Channel Shaft Eccentricity Monitor

Features:

• Part of the MMS 6000 machine monitoring system
• Integrated microcontroller
• Usable with epro eddy current sensors of the PR 642X series
• Records and stores characteristic values of the last run-up or run-down
• Self-test functions for electronic circuits and transducers
• RS 232 interface for configuration and reading out of measuring results
• RS 485 interface for connection to epro’s MMS 6850 analysis and diagnosis system or to host computers

Applications:

The MMS 6220 dual-channel eccentricity monitor processes relative radial shaft vibration signals from eddy current sensors with the following signal evaluations:

• Peak – peak
• Minimum / maximum

These measurements are used for the construction of turbine protection systems, providing signals for analysis and diagnosis systems to be further processed in field bus systems, host computers, and networks.

The cards of the MMS 6000 family are suitable for building systems to increase the performance, efficiency, and operational safety of monitored units such as steam, gas, and water turbines and to extend the machines’ lifetimes.

By connecting a laptop computer to the RS 232 interface, parameters and operation modes of the monitor can be configured. Moreover, the measured characteristic values, the order analysis, as well as data from the last run-up or run-down can be visualized.

Technical Data:

• Sensor inputs: Two independent signal inputs for eddy current measuring chains. The signal inputs are differential inputs, galvanically isolated from the power supply.
• Input impedance: ≥100 kOhm
• Input voltage range: -1…-23 V DC
• Signal frequency range: 0.017…70 Hz (1.02…4200 rpm)
• Signal voltage range: Minimum range: 0…400 mV peak; Maximum range: 0…8000 mV peak, within this range, any value is freely selectable
• Sensor supply: Each sensor has its own output buffer, galvanically isolated from all system voltages and the power supply of the monitor. Open circuit and short-circuit proof. Parallel connection with other monitors is possible without mutual influences.
• Nominal voltage: -26.7 V DC
• Maximum supply current: typ. 20 mA; max. 35 mA
• Control inputs: Common logic inputs for both channels, for choosing operating mode and limit values for “warning” and “danger”: – Open circuit or closed circuit mode – Locking of monitor
• Measuring range multiplier to modify the alarm limits during run-up or run-down. Adjustable range: 1,000 to 4,999
• 24 V Logic Input resistance: ≥ 30 kOhm
• Key pulse input: One pulse per revolution; input for system control 24 V logic Input resistance: ≥ 30 kOhm Pulse duration: Min. 10 µs (edge triggering)
• Voltage inputs: Two, one for each channel. 0…10 V Input impedance: ≥100 kOhm Resolution: 10 bit

For more information, please download or read the PDF online:  mms6220e