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How to: Setup and Run the Vibration Table “TEST” Capabilities of the SSCTM-2000 Controller Software.
This procedure is based upon a paper written by Screening Systems, Inc.
The vibration table TEST capabilities are built in to the SSC-2000 software to enable periodic and diagnostic acquisition, recording, and display of individual vibrator operational parameters. The resulting data file is essential when troubleshooting suspected vibrator, table, or air control problems. When a suspected problem occurs the TEST process should be run and the resulting data file saved as a named file. The file will have a “.vt” extension.
The following is the preferred procedure to be used when selecting appropriate variables and acquiring vibrator output data for diagnostics purposes.
Left mouse on the “Test!” pull-down menu. The Vibration Test Mode screen will appear.
The window presents with default values for the selectable variables.
These variables should be changed to the following values so that the test yields the most data in the least time.
Channel: Set the Maximum number to the number of vibrator drive channels used by your system. The yellow slide bar found at the lower center of the Manual Mode screen normally indicates the number of channels for your system. In this picture, the slide is at the number 8. Therefore, set the Channel minimum variable to 1, the Channel maximum to 8, and the increment to 1.
Multiplier: Set these variables to 100, 100, 25. Since the multiplier minimum and maximum are the same, the variable will not increment during the test so the increment variable may be set to any number within range.
Cycle Time: Set the Cycle Time minimum and maximum to 190 and the increment to any number within range.
Valve Area: Set the minimum Valve Area variable to a low value that is high enough to assure the vibrators will start. A typical setting is 75. Set the maximum Valve Area variable to 200.
This is the setting for valve full open. Increment the Valve Area in increments of 25.
Since the Cycle Time minimum and maximum are set to the same values, the X-axis Units will default to Valve Area.
The next step is to place the feedback accelerometer clusters at consistent locations that will be used each time the TEST is run. This will provide comparison data between runs performed at annual calibration intervals or when a problem is suspected. Preferred locations are shown for most standard size tables built for the model QRS type systems.
Preferred locations for 18" X 15" table
Preferred locations for 30" X 26" table
Preferred locations for 38" X 26" table
Preferred locations for 44” X 44” table.
After verifying that the compressed air is supplied to the system, left mouse on the “START” button.
As the test starts the parameters will increment through the listing of variables from left to right acquiring acceleration data at each point.
At the completion of the test a graph of each of the vibrator acceleration output gRMS values verses valve setting (area opening) will be presented.
Each colored line on the plot is the acceleration in gRMS generated by an individual vibrator air channel. Carefully count the lines on the chart to determine if the accelerometers detected vibration from each of the vibrators.
A channel that did not generate vibration will cause a colored line to be drawn along the horizontal 0.0 grid line and will therefore not be visible.
To save this data, left mouse on the File pull-down menu and select the Save As option.
When “Save As” is selected the standard Windows “Save Vibration Test File As” panel appears and the operator is prompted to enter a file name with the default “.vt “ extension.
To view a previously saved .vt file, select File\Open\Vibration Test(*.vt) and select the file. After it loads, left mouse the “NEXT” button at the lower center of the screen. This will redraw the graph lines.
For technical assistance with a vibration problem, send the just generated file name file and the file “ssc-err.log” to Screening Services & Training LLC via e-mail. mailto:firstname.lastname@example.org