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The NI Switch Health Center simplifies relay maintenance and reliability in high-channel-count NI switching systems. The NI Switch Health Center executes a hardware-integrated relay continuity test that verifies that every relay on the card is functional, executes an integrated relay resistance test that measures the resistance changes across relays, and provides access to the relay count tracking data stored on the cards. When you launch the NI Switch Health Center, the test starts automatically. Click the Start button to run the test again. Click the Abort button to stop a test in progress. Click the Report button to generate an HTML report that documents the results of the relay test and relay counts for each relay in your switching system.
The NI Switch Health Center can report the following:
|Note Some devices may not support the integrated relay resistance test.|
The NI Switch Health Center displays a thumbnail for the relay card in the main window beneath the card's PCB diagram, as shown in the figure below. You can use the drop-down arrow beneath the PCB diagram to select the PCB diagram you want to display.
For NI SwitchBlock, the NI Switch Health Center displays thumbnails representing the card occupying the numbered slot. You can click on a thumbnail to view a specific card diagram. Thumbnails for slots without cards are grayed out completely, as shown in slot 6 in the figure below.
For cards occupying more than one slot, such as the NI 2833 and NI 2834, only the thumbnail of the left-most slot is enabled and the others are disabled. Slots 1 and 2 in the figure below represent a multislot card. When you click on the thumbnail of an enabled multislot card, the diagram for the left-most PCB is displayed by default.
Results from the relay test are graphically displayed on a PCB diagram and in a sortable table, making it easy to locate relays for replacement. If you click on any relay in the PCB diagram, its corresponding relay will be highlighted in the table. Conversely, if you click on any relay in the table, its corresponding relay in the PCB diagram will be highlighted.
|Note The device temperature is displayed on the PCB diagram before the integrated relay resistance test begins. The temperature may affect the results of the resistance test.|
Double-pole relays are referred to by relay contact name. For example, a 2-Wire DPST relay is referred to as "kr0c0_w0" and "kr0c0_w1," with "_w0" referring to one relay contact and "_w1" referring to the other relay contact. When you select a relay on the PCB diagram, the first relay contact is highlighted in the results table. If you select either relay contact in the results table, the corresponding relay will be highlighted in the PCB diagram.
|Note Dashes in place of minimum, maximum, and average resistance change values (ΔΩ) indicate that the resistance test was unable to return a resistance change for the relay, due to other failed relays. A result of "N/A" in the resistance column indicates that the device does not support the integrated relay resistance test.|
If any relays fail the relay test, a banner will appear indicating that one or more relays have failed the test. The banner will also provide recommendations for the relay(s) that failed the test.
At the end of each relay test, you can generate an HTML report documenting the condition and resistance change of all the relays on each card along with their relay counts. Once the test has completed, click the Report icon to generate a report. The report can not be generated until the test for at least one card has completed. The report includes links to the online model pages for each device tested.
|Note The SHC report lists a relay as "Untested" if the resistance test was unable to return a resistance change for that relay.|