EPRO Shaft Vibration Monitor MMS 6110

EPRO Shaft Vibration Monitor   MMS 6110  

PURPOSE AND APPLICATION 

The MMS 6110 dual-channel shaft vibration monitor is part of the MMS 6000 machine moni toring system. In connection with two eddy current measuring chains, the microprocessor  controlled module serves measurement and supervision of relative shaft vibrations at all kind of turbines, compressors, fans and gear boxes.  During configuration the two channels of the monitor may be defined for separate measure ment or for the combined use. The following modes are possible: 

• Dual channel mode with two separate channels. For each channel the configuration parameters (measuring range, type of transducer, limit  values etc.), can be defined separately. Each channel calculates its own characteristical value (peak-peak or zero-peak value) and checks it on limit exceedings and faults of the measuring chain.  

• Calculation and output of maximum value Smax. The resulting maximum value Smax of the shaft vibration for the measuring directions X and Y according to DIN 45670 (characteristical value A) is calculated by geometrical addi tion of the actual values S1 (channel 1) and S2 (channel 2)

 • Calculation and output of maximum vibration amplitudes Sppmax. according to DIN 45 670, characteristical values B or max (X, Y) according to API 670. 

The characteristical value, output and checked on limit exceedings, is formed by the greatest of the two measuring values of channels 1 or 2 in X and Y-measuring direction.  The characteristical value is output as impressed current of either 0...20 or 4...20 mA.  Additionally, there is an analog output, providing a standardized d.c. output NGL of 0...+10V proportional to the static distance between sensor and measuring target.  For checking the signals on limit exceedings, there are two alarm channels, each of them with one warning (Alert) and one danger level. In the dual channel operating mode the char acteristical value is supervised by the relevant  alarm channel. 

If an error occurs and the monitoring function of the module cannot be ensured, this will be indicated by flashing or switched off LEDs and by switching off the relevant alarm outputs.  Configuration of the monitor MMS 6110 is made  by means of a laptop computer or a per sonal computer connected to the RS 232 interface socket on the front of the monitor. The software required for configuration and visualization of measuring results and states, as well as the connection cable between computer and monitor are part of the MMS 6910 W con figuration kit.  Moreover, this kit comprises the system manual on the CD-ROM with all nec essary information for testing and visualization of measuring results and the states of the monitor. The configuration of the monitor is exclusively made by means of the configuration software, there are no hardware settings necessary.  

Three different levels permit definition of the access authorization for operation, configu ration and for installation and test of the monitor.  

• Access authorization "Factory" includes all adjustments and is intended for installation purposes by the epro staff.   

• Access authorization "Service" is intended for specialists who specifies and configures the monitor for the actual application.   

• Access authorization „Operation“ permits changing settings required for the normal opera tion.  

By means of laptop/PC and the operating kit, the parameters of the selected monitor and the measuring results (including order analysis, FFT etc.) as well as the status of the monitor can be watched on the computer screen.   The Operating Kit also contains two measuring cables for measuring the sensor signals at the mini coax sockets on the monitor front. By means of these cables the coaxial sockets for the sensor signals 1 and 2 can be connected to an oscilloscope.   An RS 485 interface (at the device connector) serves the connection of the monitor to the epro MMS 6850 Analysis and Diagnosis system for acquiring and analysing measuring data. The monitor is designed as printed board in the standard euro format (100 mm of x 60 mm) with 6 TE width (approx. 30 mm) and an eloxadized front plate.   The supply of the monitor requires +24 V, two supply inputs, decoupled via diodes, permit   redundant supply of the monitor.

TECHNICAL DATA

Only specifications with tolerances are guaranteed. Data without tolerances or without error limits are only for information purposes and are not guaranteed. Technical changes, espe cially of the software, are subject to alterations.

If not stated otherwise, the specifications in the following chapter are valid for channel 1 and channel 2.

Signal conditioning

Two separate signal inputs for channel 1 and channel 2 with the signal condition ing decoupled from each other.  

Signal inputs

Differential inputs, non-reactive, open-circuit and short-circuit proof.

Sensor signal outputs

SMB front sockets, decoupled, open-circuit and short-circuit proof, non-reactive

Dynamic outputs

The dynamic part of the sensor signal is output as scaled value.

Scaled d.c. outputs

The DC part of the sensor signal is proportional to the distance between sensor and measuring target and is output as standard dc signal NGL (see section 4.2.4).

Signal conditioning for characteristical values

Before converting from analog to digital, the input signals are scaled and filtered by matching amplifier, range amplifier, high-pass and low-pass filter.  

Current outputs of characteristical values

Calculation of characteristical values and evaluation depend on the functions de fined during the configuration.

Signal outputs  EO 1 / EO 2

Voltage output  O...10V. In the dual channel mode the current outputs are as signed to the relevant characteristical value. For the operating modes Smax   and SPPmax outputs of single channel values. Measuring range and evaluation corre sponds to the characteristical values. Depending on application and configuration the outputs EO may be used for com bination with other values or for indications.   open-circuit and short-circuit proof, non-reactive.

Signal inputs EI1 / EI2

Inputs for single channel values 0...+10 V for connection to EO-outputs.

Signal input KEY

The key pulse is required to control the internal measuring procedure for the sig nal analysis.