APC 1500 VA, 3000 VA, SUM3000RMXL2U user manual affect the voltage display

FEATURE	FUNCTION
Self-Test	Automatic: The UPS performs a self-test automatically when turned on, and
	every two weeks thereafter (by default). During the self-test, the UPS briefly
	operates the connected equipment on battery.
	Manual: Press and hold the		button for a few seconds to initiate the self-
	test.
Cold Start	Supply battery power to the UPS and connected equipment in the absence of
	utility voltage (see Troubleshooting). Press the			button for one second and
	release. The UPS will beep briefly and go quiet. Press and hold the button again,
	but for approximately three seconds. The unit will emit a sustained beep. Re-
	lease the button during this beep.
Diagnostic Utility	The UPS has a diagnostic feature that displays the utility voltage.
Voltage	The UPS starts a self-test as part of this procedure. The self-test does not
	affect the voltage display.
	Press and hold the	button to view the utility voltage bar graph display.
	After a few seconds, this five-LED battery charge			display on the right of
	the front panel will show the utility input voltage.
	Refer to the figure at left for the voltage reading (values are not listed on the
	UPS).
	The display indicates the voltage is between the displayed value on the list and
	the next higher value (see Troubleshooting).

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