2 Channel / Balancing 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] CH Spectrum / TW Meas Display • Stored as two individual measurements • Spectrum / time waveform for CH1 • Spectrum / time waveform for CH2 CH Spectrum Display 2010-04-21 ©SKF Slide 11 [Code] SKF [Organisation] CH Time Waveform Display Cross Channel Phase Meas • Relative Phase - phase difference of input X relative to input Y • Both spectra are stored and may be displayed • Phase is displayed as a table of magnitude/phase pairs with up to orders of running speed 2010-04-21 ©SKF Slide 12 [Code] SKF [Organisation] Cross Channel Phase Meas Setup • Specify the Non ROUTE / User / Display Format option as Phase • 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 13 [Code] SKF [Organisation] Specify RPM Options • Three options for entering the RPM for cross channel phase meas • dBase - Take the RPM value from the GX’s database, if previously assigned to the POINT • Type In - Type in the value using the numeric keypad, or • Spec - Select the 1X RPM frequency from a spectrum display 2010-04-21 ©SKF Slide 14 [Code] SKF [Organisation] Cross Channel Phase Table CH and CH2 magnitude readings for eight orders • T key toggles between phase table and spectral displays • CH1 spectrum is displayed first • 1, and keys respectively display CH1, CH2, or dual traces of CH1 and CH2 2010-04-21 ©SKF Slide 15 [Code] SKF [Organisation] shaft speed cross channel phase readings for eight orders Cross channel phase reading for highlighted order Cross-Channel Phase Meas Storage • Stored as two individual measurements in the Review mode, occupying two lines on the Non-ROUTE Review screen • The first measurement is the CH1 spectrum, with the relative phase angle table • The second measurement is the CH2 spectrum, without the relative phase angle table 2010-04-21 ©SKF Slide 16 [Code] SKF [Organisation] Balancing Measurements 2010-04-21 ©SKF Slide 17 [Code] SKF [Organisation] Disclaimer • Real life balancing conditions require a thorough understanding of machinery vibration and balancing techniques We strongly suggest you attend the SKF Reliability Maintenance Institute Machinery Balancing course to gain balancing skills necessary for successful machinery balancing jobs • This course’s Balancing module simply overviews the Microlog’s balancing capabilities and introduces a single-plane balancing procedure to familiarize you to the machinery balancing process 2010-04-21 ©SKF Slide 18 [Code] SKF [Organisation] Microlog Balancing Overview • Resolves single-plane, two-plane, and static-couple balances with high precision • Interfaces with off-the-shelf laser tachometers, optical tachometers, or stroboscopes for balancing phase measurements • Balancing requires a shaft 1X signal either to the external trigger BNC input or to the phase adapter connector • A TTL trigger is not required The Microlog allows for an external analog trigger, with an appropriate trigger threshold 2010-04-21 ©SKF Slide 19 [Code] SKF [Organisation] Microlog Balancing Overview • Balancing “wizards” provide clear, comprehensive setup menus and easy-to-follow display screens with graphical data representations to ensure easy, accurate balancing jobs 2010-04-21 ©SKF Slide 20 [Code] SKF [Organisation] additiona l setup options stored balancin g jobs Balancing “Run” Overview • Stop - Set Up Balancing Equipment and Measurement Parameters • • • • • • • Spin - Perform the Reference Run Stop - Attach a Trial Weight Spin - Perform the Trial Run Stop - Attach the Permanent Correction Weight Spin - Perform a Correction Weight Run Stop - If Necessary, Attach a Trim Weight Spin - Perform a Trim Run 2010-04-21 ©SKF Slide 21 [Code] SKF [Organisation] Example Balancing Run Screens 2010-04-21 ©SKF Slide 22 [Code] SKF [Organisation] Quick Review 2010-04-21 ©SKF Slide 23 [Code] SKF [Organisation] ... Institute Machinery Balancing course to gain balancing skills necessary for successful machinery balancing jobs • This course’s Balancing module simply overviews the Microlog’s balancing capabilities... [Organisation] Balancing Measurements 2010-04-21 ©SKF Slide 17 [Code] SKF [Organisation] Disclaimer • Real life balancing conditions require a thorough understanding of machinery vibration and balancing... and introduces a single-plane balancing procedure to familiarize you to the machinery balancing process 2010-04-21 ©SKF Slide 18 [Code] SKF [Organisation] Microlog Balancing Overview • Resolves