Condition MonitoringTechNote #CM9 OMNITREND® Carrying out RPM-normalized measurements efficiently with the ‘TrainSpeed’ function Brief description The RPM is required for the normalization of shock pulse measurement (roller bearing condition) and for the calculation of RPM-variable damage frequencies. The RPM at any measurement location of a machine train can be calculated using the ‘TrainSpeed’ function in OMNITREND - provided that a reference RPM and the corresponding translation ratio between the reference point and the respective measurement location is known. This TechNote shows how to set up the necessary measurement parameters in OMNITREND and how to carry out the measurement with VIBXPERT as part of a route. n1 = n0 x 1.0 n2 = n0 x 0.6 n3 = n0 x 0.06 Reference RPM n0 n4 = n0 x 0.01 Machine train with three gear translations Suitable for... Machine trains with a number of measurement locations at which the RPM of the machine elements is different due to gear translation. dBn Advantages The RPM no longer needs to be measured at each measurement location, but at a single ‘reference measurement location’. The RPM for all other measurement locations on the machine train is calculated. dBn Procedure in OMNITREND Set up the machine train with its measurement locations and measurement tasks in the OMNITREND database. Details of how to set up database entries are described in the OMNITREND online help. A summary of the basic steps is described in the following section: ATTENTION The ‘LineSpeed’ function must be deactivated. To check this, click on the ‘Common data’ tab in the hierarchy above the machine train (‘Location’ = North area). RPM normalization for shock pulse measurement (roller bearing condition) and calculation of the (roller bearing) damage frequencies ‘Exhaust fan’ machine train = Motor + Fan Bearing Then select the permitted min.Open the ‘Train Data’ tab.In the tree view. and click on OK. Manual input of the reference RPM To manually enter the reference RPM in situ. .Open the ‘Meas. ‘0-100000’).page 2 of 4 To set up the reference measurement . . and max. .manual input’ transducer as the transducer for the speed measurement with VIBXPERT.g. click on the RPM measurement task. value limits (e.Enter ‘Manual Input’ as the signal type.g. . Create the RPM transducer for ‘Manual input’ (left) and change it for the measurement task (below).PRÜFTECHNIK Condition Monitoring OMNITREND® TechNote #CM9 .Enter the measurement task for the reference RPM in the ‘Reference task’ field using ‘Drag & Drop’. ‘RPM manual input’).Select ‘Speed’ as the measurement quantity.Enter a name for the new transducer (e. Type’ tab. . . . an RPM transducer must first be created and adapted accordingly to the measurement task: .Open the ‘Transducer Editor’ and click on ‘New Transducer’. . To change the RPM transducer for the measurement task: .Click on ‘Add’ and select the newly created ‘RPM . .Mark the ‘VIBXPERT transducer’ entry in the ‘Transducer’ field. .Activate the ‘TrainSpeed’ function in the ‘Common Data’ tab at machine train level. manual input’). create this with the ‘Task Wizard’ and select the newly created RPM transducer (‘RPM . Connect VIBXPERT to the PC and load the route in the data collector. To enter the translation ratio Enter the respective translation ratio for the reference location of each machine and each measurement location on the machine train: Machine: Mark the machine and open the ‘Machine Data’ tab. 1.02 1. . Data’ tab.page 3 of 4 If no ‘Speed’ measurement task has yet been created.PRÜFTECHNIK Condition Monitoring OMNITREND® TechNote #CM9 .03 To compile the route and transfer data Open the Route Editor and create a route with the relevant machine train. Measurement location: Mark the measurement location and open the ‘Meas. pruftechnik. Box 12 63 D-85730 Ismaning.O.Open the route in VIBXPERT.com Productive maintenance technology . . If the RPM needs to be entered manually.page 4 of 4 Measuring with VIBXPERT . PRÜFTECHNIK Condition Monitoring P. Germany Phone: (+49) 89 99 61 60 Fax: (+49) 89 99 61 63 00 www.PRÜFTECHNIK Condition Monitoring OMNITREND® TechNote #CM9 . .Measure the RPM.Select the measurement task for the reference RPM. the ‘Manual input’ screen appears.