MMS System Manual MMS 6000 Part 2 Direction for use Shaft Vibration Monitor MMS 6110

Please note 

In correspondence concerning this instrument, please quote type number and serial number as given 

on the type plate and software version if applicable. 

Bitte beachten 

Bei Schriftwechsel über dieses Gerät wird gebeten, die Typennummer und die Gerätenummer wie auf 

dem Typenschild aufgedruckt, sowie die Softwareversion (wenn vorhanden), anzugeben 

Important 

As this instrument is an electrical apparatus, it may be operated only by trained personnel. Maintenance and repairs may also be carried out by qualified personnel. 

Wichtig 

Da das Gerät ein elektrisches Betriebsmittel ist, darf die Inbetriebnahme und Bedienung nur durch 

eingewiesenes Personal erfolgen. Wartung und Reparatur dürfen nur von geschultem, fach- und sachkundigen Personal durchgeführt werden. 

PURPOSE AND APPLICATION 

The MMS 6110 dual-channel shaft vibration monitor is part of the MMS 6000 machine monitoring 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 measurement 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 addition of the actual values S1 (channel 1) and S2 (channel 2) [S )t( 1s )t( s2 )t(

2 2

m = + ]. The 

maximum value Smax is output as characteristical value and checked on limit exceedings 

• 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 characteristical value is supervised by the relevant alarm channel. The limit values for pre alarm 

(ALERT) and main alarm (DANGER) may be adjusted separately. 

With measuring modes max. value Smax and vibration amplitude Sppmax resp. max(X,Y) the 

characteristical value, calculated from both channels, is supervised by the alarm channels of 

both measuring channels - but with only one "Alert" and one "Danger" limit. 

During configuration the alarm outputs can be activated and the limit values defined. The 

alarm status is shown by two red LEDs on the front of the monitor. The module provides four 

relay driver outputs which can alternatively be switched to normally closed or normally open 

operation mode. 

Input "Alarm blocking" permits blocking of the alarm outputs by means of an external signal. 

During configuration, response delay and alarm blocking at fault situations can be defined. 

Two green LEDs on the front and two relay driver outputs indicate the status of channel and 

monitor supervision. In the normal state, i.e., if neither the channel nor the module supervision have detected an error, if the channel measurement is in the settled state and the 

alarms are not blocked, message "Channel Clear = OK" will be indicated.

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 personal 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 configuration kit. Moreover, this kit comprises the system manual on the CD-ROM with all necessary 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.