OPTI-UPS 280ES User Manual page 20

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2.2 On/Off Button:
Hold the front panel On/Off button for two seconds to turn on the UPS and power the load.
Hold the On/Off button again for two seconds to turn off the UPS and power to the load.
2.3 Test/Silence Button:
The Test/Silence Button has two functions:
1. Test Feature: It is a good idea to test the UPS once in a while to verify that the
batteries are in good condition. If you press the Test/Silence Button when AC
power is available, the UPS will test itself by switching to its internal battery for a
few seconds. We recommend you close all your open files before initiating this
test.
2. Silence Feature: When AC power fails, the UPS will warn you with an audible
alarm. To silence the alarm, press the Test/Silence Button. The alarm will resume
with a faster beeping when the UPS when the UPS battery is low. To silence the
alarm again, press the Test/Silence Button.
280ES / 420ES / 650ES / 1000ES / 1400ES
Front Panel Controls