Measuring The Backup Time; How To Measure Backup Time; Estimated Backup Time - Omron BN75R Instruction Manual

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Measuring the backup time

5-1

How to measure backup time

The backup time you measure for the first time after purchase is the "initial value of the backup time."
You can precisely judge the deterioration condition of the battery if you measure the "initial value of the
backup time" in advance at the time of a battery check.
(1) Connect the AC input plug to commercial power and charge the battery for 4 hours (Charging time
is extended 24 hours per unit, if additional battery unit is connected).
(2) Turn ON all devices connected to the unit.
(3) Disconnect the AC input plug and measure the backup time.
In Battery Mode, measure the time until the unit automatically stops and all displays disappear.
The power supply output of the unit will stop when the battery discharges. Conduct
measurement under a condition in which no problem occurs even if the power supply of the
connected device stops during the process. Do not conduct measurement if there is a
possibility of a failure when the power supply stops.
5-2

Estimated backup time

(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) 100 VAC, 50/60Hz, 145 W
Example 2) 100 VAC, 50/60Hz, 1.8 A
Example 3) 100 VAC, 50/60Hz, 150 VA
For devices that use the VA or A indication, convert the capacity into W. Multiply the value indi-
cated 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.
(3) Calculate the initial value of the backup time for the total capacity of the connected devices from
the graph below.
Graph of backup time (graph of initial values for products that have not been used at 25°C)
●
The backup time becomes shorter than the graph (table) below when temperature is lower.
● The smaller the capacity of connected devices becomes, the longer the backup time becomes.
Indication Value
VA × power factor = W
A × power factor × 100 = W
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