BENTLY NEVADA SYSTEM 1® TIPS & TRICKS

February 2012, Volume 3, Issue 2

Dear System 1® User, The often-overlooked XvsY plot format is a powerful tool for gaining valuable insight into how your asset responds to various operating conditions. XvsY plots reveal how one parameter affects another, like the plot below of thrust load versus Megawatts from an operating hydro generator unit. In this month’s issue of System 1® Tips & Tricks we’ll show you how to configure an XvsY plot using historical data. We hope you enjoy this issue! Sincerely, Your North America FAE team This month’s tip by: Mark Snyder, Field Application Engineer, Citrus Heights, CA

Versions: All Applies to: System 1 Plots

User Level: Power User Diagnostic User IT Group Mid Level User Occasional User New User

Using XvsY Plots to Evaluate Machine Behavior

1 Example XvsY plot, showing how thrust load varies with Megawatt load for two different reservoir elevations (indicated by red and blue). Note the crosshair cursor that allows you to display individual point values in the headers.

Crosshairs

2 Click on the XvsY icon in the Plots toolbar or drop-down menu to open the Plot Group Configuration dialog box.

3 First, drag the variable you want for the X (horizontal) axis into the dialog box and drop it on New Plot to create Curve 1.

4 Then drag the variable you want for the Y (vertical) axis into the dialog box and drop it on Curve 1. Tip: additional XvsY curves can be created in the same plot.

5 If you want a scatter plot style (no lines connecting data points), click on the View tab and click the radio button next to “Scatter Dots”.

6 If you don’t want to use the current Plot Session Data Range settings for your curve, select Curve 1 with the mouse and click the Configure Curve button to open the Curve Settings dialog box. Uncheck “Use Plot Session Data Range” and configure the data source settings for the range of data you want. Tip: curves in the same plot can have different data ranges.

7 Click Apply and OK to see your plot. Here is a plot of simulated data, showing how a radial vibration measurement varies with Megawatt Load. Tip: moving your mouse over the plot displays a small window containing the X and Y values corresponding to the mouse pointer location.

8 Now that you’ve created the plot, you can save it in your Plot Session Manager for future viewing.

9 Changing the data source for the plot to an appropriately long Recent Date Range will automatically keep the plot up-to-date with the most recent data, and help you spot any deviations from historical norms.

10

DID YOU KNOW? System 1® can store and display data by operating condition categories you define. The System 1® State-Based System Extender helps you manage your machine more intelligently by configuring unique sample rates and alarm levels for user-defined operating ranges of speed, flow, load, etc. Features include:

Current state identified in hierarchy view, Data storage stopped when machine not running, Plots by individual operating state, or all states color-coded on a single plot, Curve fit to data, and Baseline Curve overlays for XvsY plots, Histograms showing operating time in each state.

Contact your local Bently Nevada office or click here to request more information.

Bently Nevada Technical Support: bntechsupport@ge.com 775-215-1818

Bently Nevada website: http://www.ge-mcs.com/en/bently-nevada.html System 1 Blog (You’ll need to join the forum): http://supportcentral.ge.com/blog/blogs_frame.asp?prod_id=20858