2 Channel / Balancing / Bump Test / and Recorder Measurement Overview 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Module Objective(s) To overview “advanced” applications available on the GX Series Microlog, including: • Two channel measurements • Balancing measurements • Bump Tests • Recording vibration signals 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Two Channel Measurements 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Two Channel Measurement Overview • • • Two channel measurements may be triggered or non triggered For simultaneous two channel measurements, one of the two channel inputs must be input Y (CH2) Not able to view orbit displays in the Microlog’s Review mode 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Orbit Time X vs time Y, unfiltered or orderfiltered (up to orders), plus DC gap measurement Dual Spectrum Spectra of both input channels captured and displayed simultaneously Dual-Time Time waveforms of both input channels captured and displayed simultaneously CrossChannel Phase Phase of input X relative to input Y: Both spectra are stored and phase is displayed as a table of magnitude/phase pairs with up to orders Ch Meas Accessed from Non ROUTE Mode • Select the Orbit standard meas type, or • Set up User defined two channel meas with X & Y inputs • • • dual spectrum dual time cross channel phase 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Orbit Measurement Overview • An “orbit” measures the path of a shaft centerline motion during rotation • Machines such as large centrifugal compressors, primary and secondary steam turbines, and large gearboxes • Machinery that uses pressure fed sleeve bearings is normally both critical to plant operations and very expensive to repair • It is essential that these rotors are effectively monitored, protected, and maintained to the highest standard 2010-04-21 ©SKF Slide [Code] SKF [Organisation] Orbit Measurement Sequence orbit meas selection 2010-04-21 ©SKF Slide [Code] SKF [Organisation] orbit meas setup orbit meas display Orbit Measurement Display shaft speed • Results saved as four individual meas • • X / Y displacement at cursor position Two overall displays for the DC Gap measurements, one for CH1, the next for CH2 Two graphic displays for the two dynamic orbit traces, one for CH1, the next for CH2 2010-04-21 ©SKF Slide [Code] SKF [Organisation] cursor (dot) at trigger location (line) shaft position relative to rotational center for DC gap measurements view dual time waveforms CH Spectrum / Time Waveform Meas • Spectra / time waveforms of both input channels captured and displayed simultaneously • Both channel traces are displayed in a split screen • – to display only the upper trace • – to display only the lower trace • – to display both traces (default) 2010-04-21 ©SKF Slide [Code] SKF [Organisation] CH Spectrum / TW Meas Setup ∗ Specify the Configuration menu’s Single Shot or Continuous option • Specify the Non ROUTE / User / Display Format option as either Spectrum or Time • Specify the Non ROUTE / User / Input Channel option as either X & Y or Z & Y • Configure other User setup screen parameters as needed 2010-04-21 ©SKF Slide 10 [Code] SKF [Organisation] Bump Test Setup Fields • • • Sensor Type – specifies the type of sensor used (typically Accel G) • • • X-axis units (Default Units) – Hz or CPM • Lines – spectrum’s lines of resolution Sens (mV/EU) – transducer sensitivity Range (EU) (Full Scale) – specify the spectrum’s maximum amplitude value (full scale) (typically 20 G) Filter – High-pass filter setting (typically Hz) Freq Range (Fmax)– FFT upper full-scale frequency, up to 40,000 Hz (2,400,000 CPM) (typically 1000 Hz for normal machinery speeds) 2010-04-21 ©SKF Slide 27 [Code] SKF [Organisation] Bump Test Setup Fields (continued) • Avg Type – Pk Hold or Exponential - for bump tests, specify Peak Hold averaging The Microlog holds the highest spectral peak for each hammer hit For exponential averaging, the Microlog averages multiple hits to minimize the noise level, however, you must pause the averaging process after the last hit • Display Y-axis – Linear or Logarithmic - specify the type of y-axis scaling Typically set to Linear 2010-04-21 ©SKF Slide 28 [Code] SKF [Organisation] Bump Test Display Screen • Commence bump test hits • Move cursor to identify natural frequencies saves the current bump test spectrum 2010-04-21 ©SKF Slide 29 [Code] SKF [Organisation] Saving / Reviewing Bump Test Data • Bump test spectra cannot be uploaded and viewed with SKF Machine Analyst software • Bump test spectra stored in comma separated value format (.csv) in the GX’s Mobile Device/Internal Disk/Analyzer folder • These csv spectra files may be viewed with the GX’s Bump Test module, or may be copied to the host computer (using ActiveSync and Windows Explorer) and viewed with Microsoft Excel or other host application 2010-04-21 ©SKF Slide 30 [Code] SKF [Organisation] Copying Bump Test Data to a PC • Connect the Microlog to your host computer’s USB port, Microsoft ActiveSync should display a Connected – Synchronized message • Using Windows Explorer, copy the stored spectrum files (.csv files) from the GX’s Mobile Device/Internal Disk/Analyzer folder to an appropriate folder on the host computer 2010-04-21 ©SKF Slide 31 [Code] SKF [Organisation] Backing Up Bump Test Files to PC Card • Insert a memory card into the Microlog • From the Review Data screen, select a spectrum for backup, or select all • Press and hold the Shift key (zero / up arrow) to display the Backup function button, then press the Backup function button • All specified spectral files are copied to the PCMCIA/SD card shifted function button 2010-04-21 ©SKF Slide 32 [Code] SKF [Organisation] Recording Raw Signal Data 2010-04-21 ©SKF Slide 33 [Code] SKF [Organisation] Recorder Overview • Records two-channel raw vibration signal (time waveform) as a Microsoft Windows wav audio file • Recorded time waveform(s) may be viewed on the Microlog for in-the-field analysis, or • wav file can be imported into vibration analysis software where you can play the wav recording and post-process vibration analysis measurements on it as if you were performing measurements on the machine in real time 2010-04-21 ©SKF Slide 34 [Code] SKF [Organisation] Recorder Setup one or two channel recordings maximum recording time with current setup save recording setup 2010-04-21 ©SKF Slide 35 [Code] SKF [Organisation] start Preview mode Recorder Setup Fields • • Input – (CH1, CH1 & CH2, or CH1 & Tacho) CH1 Type – Specifies the type of sensor used on CH1 Sens1 (mV/EU) – Use the alphanumeric keypad to enter transducer sensitivity in millivolts (mv) per Engineering Unit (EU) for CH1 Range1 (Full Scale Value) - Specify the expected maximum amplitude range value for CH1 If Input field is set to CH1 & CH2 or CH1 & Tacho, then CH2 Type and its Sens2, and Range2 fields operate identical to those for channel one • Freq Range (Fmax) – enter the FFT upper full-scale frequency in Hz, up to 20 kHz for CH1 inputs, or up to 10 kHz for CH1 & CH2 and CH1 & Tacho inputs • • Save To – (Internal, PC Card, or SD Card) Rec Time (s) – Specify the number of seconds to record the vibration signal 2010-04-21 ©SKF Slide 36 [Code] SKF [Organisation] Recorder Setup Fields (continued) • Rec Mode – (Manual, CH1 Level, or Tacho) Works with the Input field and following Trig Level field Specify whether to initiate data recording manually, or to use a CH1 trigger level to initiate recording, or to use a tachometer for triggering data recording, if Input is set to CH1 & Tacho (in this case, as soon as the Microlog receives a tachometer signal, data recording initiates) • Trig Level (EU) – If Rec Mode is set to CH1 Level, specify the channel one trigger level to initiate data recording 2010-04-21 ©SKF Slide 37 [Code] SKF [Organisation] Preview Mode • Display continuously updates to display channel’s live time waveform signal and overall vibration reading • Allows you to view the validity of the measurement parameters • Allows you to alter machine’s running characteristics 2010-04-21 ©SKF Slide 38 [Code] SKF [Organisation] Preview mode start recording Recording Data • Screen’s time waveform freezes • Recording Time remaining counts down in the message area • When the recording ends, the Recorder – Save Data screen automatically displays 2010-04-21 ©SKF Slide 39 [Code] SKF [Organisation] recording time remaining pause recording Saving / Reviewing / Copying / Backing Up • Recorded time waveforms are stored in comma separated value format (.csv) and wav format in the GX’s Mobile Device/Internal Disk/Analyser/Recorder folder • csv time waveform files may be reviewed in the field with the Recorder’s Review Data option • wav audio files may be imported into vibration analysis software for post processing • Procedures for saving measurement setups, for saving measurement results, for backing up measurements, for reviewing stored measurements, and for deleting stored measurements are identical with the Bump Test module 2010-04-21 ©SKF Slide 40 [Code] SKF [Organisation] Quick Review 2010-04-21 ©SKF Slide 41 [Code] SKF [Organisation] ... Trim Run 20 10-04 -21 ©SKF Slide 21 [Code] SKF [Organisation] Example Balancing Run Screens 20 10-04 -21 ©SKF Slide 22 [Code] SKF [Organisation] Performing Bump Tests 20 10-04 -21 ©SKF Slide 23 [Code]... setups for reuse 20 10-04 -21 ©SKF Slide 25 [Code] SKF [Organisation] Bump Test Setup saves the current bump test settings 20 10-04 -21 ©SKF Slide 26 [Code] SKF [Organisation] take bump test data using... damaging vibration 20 10-04 -21 ©SKF Slide 24 [Code] SKF [Organisation] Bump Test Menu set up a new bump test and begin data collection review stored bump test results recall previous bump test meas setups