American Power Conversion 400 user manual Output Power bar graph, UPS self-test

5.0 Operation

5.2.2 Output Power bar graph

When you press and hold the rear-panel Test button for at least 4 seconds, the LED indicators on the front panel display a bar graph of the power being drawn by the load connected to the UPS. The load is shown as a percentage of the UPS’s rated capacity.

17% 34% 51% 68% 85%

This example shows that the equipment plugged into the UPS is drawing between 68 and 85 percent of the UPS’s rated capacity. This is a typical load configuration.

If all five indicators light, the load is drawing close to the UPS’s maximum capacity! You should thoroughly test your entire system to be sure the UPS will not become overloaded. A thorough test includes running backup tape drives, disk drives, etc. If the UPS is overloaded, the Overload indicator lights and the UPS sounds an alarm.

To avoid an overload, reduce the UPS’s load by unplugging non-critical components such as printers.

Note: When you release the Test button after viewing the Output Power bar graph, the UPS performs a self-test. Refer to Section 5.2.3.

5.2.3 UPS self-test

When you press and hold the Test button for at least 4 seconds and then release it, the UPS performs a self-test. During this test the UPS operates the load from battery (On Battery indicator lights) for about 4 seconds and then returns to line power. If the battery cannot support the load during the test, the UPS immediately returns to on-line operation (the load is not affected). When the On Battery indicator goes out and the On Line indica- tor lights, the test is done.

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