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5. Measuring the backup time
5. Measuring the backup time
5-1 How to measure backup time
(1) When the AC input plug is connected to a wall outlet (commercial power), the battery automatically starts
charging, taking up to 8 hours to complete (24 hours when an additional battery unit is connected).
(2) Turn ON all devices connected to the power output to be “backed up during a power failure”.
(This includes devices connected to the AC outlet of your computer.)
Operate the connected devices in a way that allows the power supply to be stopped at any time.
● For Windows Server 2003/XP/Me/2000/Windows NT/Linux/Mac:
Perform measurement while the hard drive is stopped.
● For Windows 98/95:
Choose "Shut Down" in Windows and follow the procedure below to shut down your OS.
Choose "Restart in MS-DOS mode" to exit from OS and display the MS-DOS mode screen.
(3) Disconnect the AC Input Plug of the UPS and measure the backup time.
Measure the time until the unit automatically stops and all displays disappear with the plug disconnected.
* The backup time you measure for the first time after purchase is the "initial value of the backup time."
5-2 Estimated backup time
The backup time varies depending on the capacity of connected devices.
After calculating the total capacity of connected devices, refer to the graph of the backup time to obtain an
estimation of the initial value of the backup time. (This is also applied to checking the battery.)
(1) Convert the total capacity (power consumption) of the connected devices to watts (W).
For the indication of connected devices, check your computer and the rear of the display.
The indicator can show values in three different ways: volt-amperes (VA), amperes (A), and watts (W).
Example 1) 200 VAC, 50/60Hz, 145 W
Example 2) 200 VAC, 50/60Hz,
1.8 A
Example 3) 200 VAC, 50/60Hz,
150 VA
For devices that use the VA or A indication, convert the capacity into W. Multiply the value indicated on
devices by the value in the right table for conversion.
(When the power factor is unknown, enter “1”. The power factor usually ranges between 0.6 and 1.)
(2) Add the values converted into W to obtain the total capacity of the connected devices.
Caution
Never touch the metal part of the input plug if it is disconnected while the
unit is operating.
● Doing so may cause an electric shock.
● The leak current of this product itself is less than the value of the safety standard (leak current:
1 mA). However, leak current increases due to connected equipment. Therefore, never touch the metal
part of the input plug.
● When the product is operating, voltage is generated at the metal part of the input plug via capacitors in
the internal circuit regardless of elapsed time.
Indication Value
VA × power factor = W
A × power factor × 200 = W