OPTI-UPS PS7500DL - Manual (Page 13)

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2. By pressing the Enter- key and the Down-key simultaneously for 3
seconds until the buzzer beeps twice, the UPS will start up and Normal
LED lights up to indicate the power is from its inverter to the load.
3. When the LCD Select Down-key and the LCD Select Up-key are pressed
simultaneously for 3 seconds until the buzzer beeps twice, the inverter will
be turned off and the UPS is on the standby status (LCD display
illuminates and Normal LED is blinking) until AC source is disconnected.
6.3 Storage Instruction
Disconnect input power in rear panel if you will not use it for long period. If
the UPS is stored over 3 months, please keep supplying power to the UPS
for at least 24 hours to ensure battery fully recharged.
6.4 LCD Display
Use Up/Down key to select menu-displays of the LCD described below. This
screen will refresh once the system power is enabled.
Note: Following menus are based on 220V system. To 110V system, menus are
same with 220V system except voltage values have some difference.
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1 Rated Spec Menu 2 Status Menu
3 Voltage Menu
4 Frequency Menu