User Manual Frequency Response Function Extension Module for the Dynamix 2500 Data Collector Catalog Number 1441-DYN25-MFRF
Important User Information Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.rockwellautomation.com/literature/) describes some important differences between solid-state equipment and hard-wired electromechanical devices.
Table of Contents Preface Optional Extension Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Chapter 1 Installing Optional Extension Modules Install an Extension Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Uninstall an Extension Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents Notes: 4 Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
Preface This manual describes the FRF Frequency Response Function Extension Module for the Dynamix 2500 data collector. You install the extension module with the FRF Secure Digital (SD) card. See Installing Optional Extension Modules on page 7 for installation instructions. When using the Dynamix 2500 data collector and the FRF Frequency extension module, you can do the following: • Determine natural frequencies. • Model the way a structure reacts to forces.
Preface Additional Resources These documents contain additional information concerning products from Rockwell Automation. Resource Description Dynamix 2500 Data Collector User Manual, publication 1441-UM001 Describes the Dynamix 2500 data collector, which provides predictive maintenance by using noise and vibration analysis. Dynamix 2500 Data Collector Bump Test Extension Module User Manual, publication 1441-UM002 Describes how to determine natural (or resonant) frequencies of a machine or structure.
Chapter 1 Installing Optional Extension Modules The data collector uses the Extension Manager to install and uninstall extension modules. These extension modules are licensed and ordered separately from the basic entry-level product. Topic Page Install an Extension Module 8 Uninstall an Extension Module 10 Manage Extension Modules 12 Extension Module Battery Status Indicators 13 The installation Secure Digital (SD) cards that you receive work with any Dynamix 2500 data collector.
Chapter 1 Installing Optional Extension Modules Install an Extension Module Follow these instructions to install an extension module. 1. Open the base cover at the bottom of the Dynamix 2500 data collector. 2. Place the extension module Secure Digital (SD) card contact side-up into the unit until it is firmly seated in place. 3. Close the base cover. 4. Apply power to the data collector. 5. From the Main Menu, select Setup Utility and press Enter. 6.
Installing Optional Extension Modules Chapter 1 The Extension Manager screen appears showing the current extension module installations. 8. Press 0 (Shift) to display the Install Extension function. 9. Press F2 (Install) to install the new extension module. When the installation is complete, a confirmation prompt appears. 10. Press F4 (OK). The new extension module appears in the list. 11. Press F4 (Esc) to exit the Extension Manager screen.
Chapter 1 Installing Optional Extension Modules Uninstall an Extension Module Follow these instructions to uninstall an extension module. 1. Press 0 (Shift) from the Setup Utility screen to display the Extension Manager function. The Extension Manager function remains on the screen for about 3 seconds after releasing 0 (Shift). Extension Manager. 2. Press F1 (Extn Mgr). The Extension Manager screen appears. This screen lists the extension modules currently installed and the on the unit. 3.
Installing Optional Extension Modules Chapter 1 A checkmark appears next to that extension module. 4. Press F1 (Uninstall). A confirmation message appears. 5. Make sure your installation card is inserted into the instrument. IMPORTANT The extension module is uninstalled and the license on the card is released so that the card can be used to install the extension module on another Dynamix 2500 data collector.
Chapter 1 Installing Optional Extension Modules Manage Extension Modules The Dynamix 2500 data collector lets you to hide installed extension modules from the Main Menu. You may need to hide an advanced extension module icon from an inexperienced user, for example, RUCD and FRF. IMPORTANT Once an extension module is hidden, its icon is not represented on the Main Menu or displayed in the Dynamix 2500 data collector About screen.
Installing Optional Extension Modules Chapter 1 3. Select the extension module that you want to hide or show and press F2 (Show/Hide). TIP If you want to show or hide multiple extension modules simultaneously, select each extension module and press F3 (Select). A checkmark appears next to each selected extension module. If you select multiple extension modules and some are hidden while others are shown, F2 (Show/Hide) reflects the status of the selected extension module. 4.
Chapter 1 Installing Optional Extension Modules Notes: 14 Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
Chapter 2 FRF Frequency Response Function Extension Module The Frequency Response Function (FRF) extension module is an optional module for the Dynamix 2500 data collector. You install the extension module with the FRF Frequency Response Secure Digital (SD) storage card. See Install an Extension Module on page 8 for installation instructions.
Chapter 2 FRF Frequency Response Function Extension Module Newton’s Law and Apparent Mass Newton’s Law states that force equals mass x acceleration: F = ma Rearranging this gives: m = F/a The units for this are N/m/s2. The definition of a Newton: N = kg x m/s2 So we can see that: N/m/s2 = kg Setting Up an FRF Measurement When setting up an FRF measurement, first set up the test hardware before you configure the parameters for the FRF Module.
FRF Frequency Response Function Extension Module Chapter 2 Follow these instructions to set up the FRF test apparatus. 1. Fit the correct tip to a modally tuned hammer. The hammer is used to create the force that is to be measured in the FRF. TIP Use a harder tip for higher frequency and a softer tip for lower frequency measurements. 2. Connect the modally tuned hammer to Connector A of the instrument. 3. Support the object being tested, allowing free movement, for example, on a foam support. 4.
Chapter 2 FRF Frequency Response Function Extension Module FRF Module Setup There are three parameters that have already been configured to make the setup easier. These are the measurement parameters that are already configured for you: • Pre-trigger delay – set to 10% of block length • Trigger level – set to 10% of input range • Good Coherence- 80% threshold All other settings can be configured on the Setup screen in the FRF extension module. 1. From the Main Menu, select the FRF icon and press Enter.
FRF Frequency Response Function Extension Module Chapter 2 The FRF menu appears. 2. Select Setup and press Enter. The FRF - Setup screen appears.
Chapter 2 FRF Frequency Response Function Extension Module FRF Analysis Set-up Parameters This table describes the FRF set-up parameters. Table 2 - FRF Analysis Set-up Parameters 20 Parameter Description Value/Comments Acquisition Mode Set to Hammer for FRF acquisition and modal analysis, or set to Continuous for ODS analysis. If you are performing ODS analysis, refer to the instructions that accompanied your ODS software for additional information on settings that are required.
FRF Frequency Response Function Extension Module Chapter 2 Table 2 - FRF Analysis Set-up Parameters Parameter Description Value/Comments Num of Lines Sets the number of lines of resolution for the FFT. The Acquisition time information box changes accordingly. When set to Automatic, the FRF module automatically chooses the number of lines after three trial hits. This uses a Uniform window if possible and automatically increases the lines of resolution to accommodate the decay time.
Chapter 2 FRF Frequency Response Function Extension Module Collect FRF Data Once the measurement is set up and the transducers are attached correctly, the next step is to start collecting data for the FRF. Follow these instructions to collect FRF Data. 1. From the Setup screen, press Start. If you have Hammer Range, Response Range, or Num of Lines set to automatic, a message appears advising you that you will be asked to perform three trial hits.
FRF Frequency Response Function Extension Module Chapter 2 When hitting the object, try to make sure that you have one clean tap and that the hammer hits directly opposite of where the accelerometer is located on the object. If this is done correctly, the instrument registers the hit and increases the number-of-hits count displayed at the bottom of the screen. 3. Perform all three hammer strikes. Once complete, a message box appears showing the calculated values for the applicable settings.
Chapter 2 FRF Frequency Response Function Extension Module The status indicators provide feedback on the hammer hits. Table 3 - Status Indicators Status Indicator Description Red An error, for example, input overrange, during data acquisition. Amber Instrument is initializing the measurement. Green Instrument is collecting data. In Hammer mode, it is looking for a hit.
FRF Frequency Response Function Extension Module Chapter 2 The FRF - Taking Data screen shows frequency, magnitude, phase, and Q factor (where appropriate) at the cursor position. The FRF is colored red where coherence falls below 80%. Good coherence shows the trace in green. FRF Measurement Coherence for the measurement, represented by the color of the FRF trace. Phase Indicates how many hits were taken.
Chapter 2 FRF Frequency Response Function Extension Module 2. Connect the hammer to connector A. 3. Select an accelerometer of correct mass and connect to connector B. 4. Place the accelerometer on mass. The mass can be hand-held. The use of foam or a supporting structure is not necessary. 5. Set the Measurement parameter to Apparent Mass. 6. Set the Meas Units parameter to N/m/s2.
FRF Frequency Response Function Extension Module Saving, Reviewing, and Deleting FRF Measurements Chapter 2 You can save measurement setups and measurement results. You can use these for reviewing and recalling stored measurements. Save an FRF Test Setup and Measurement You can save the FRF Test set-up parameters and measurements to a file that you can recall at a later time. Follow these steps to save a file. 1. Press F3 (Save). The Save screen appears.
Chapter 2 FRF Frequency Response Function Extension Module Importing to ODS Analysis Software. Operating Deflection Shapes (ODS) analysis is used for determination of the vibration pattern of a structure under certain operating conditions. Vibration measurements can be performed at different locations and in different directions on a structure and the vibration pattern can be shown as an animated geometry model of the structure or listed in a shape table.
Index B bad data avoid 17 battery status icons 13 battery status icons 13 corrupt 17 offroute 15 modal analysis 15 N Newton’s Law 16 C calibration 25 coherence 15, 18, 21, 25 E Emonitor 15 Extension Manager 7 O Operation Deflection Shape 15 P parameters 20 phase 25 pre-trigger delay 18 F FFT 21 frequency 15 freq range 20 FRF setup 20 I R response range 20 S sensor 20 status indicators 24 install extension module 8 T L license extension module 11 test equipment accelerometer 16, 26 hammer 16, 17
Index Notes: 30 Rockwell Automation Publication 1441-UM003A-EN-P - May 2011
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