Operation
Figure 35 Battery time screen (15-minute discharge)
500 | VDC |
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| SELECT : MASTER MENU | ||
480 |
| Low Battery Warning | |
| Calculated Time (Hrs:Min) | ||
460 |
| Total 00:15 Remain 0:01 | |
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440 |
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420 |
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400 |
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380 | Battery Shutdown = 384 |
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360 | Rated Time (Hrs:Min) | ||
Battery Charge = 5% | |||
Total 00:10 Remain 0:00 | |||
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340 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Time (Minutes)
The screen also displays alarm messages (Battery Discharging, Low Battery Warning and Battery Shutdown) and a set of five parameters that inform the operator of battery condition and time remaining. The five parameters describing battery resources are:
•Rated Total Time, in hours and minutes, is the amount of battery backup time that should be available under full rated load, based on system design.
•Rated Time Remaining is the Rated Total Time less the duration of the present discharge event.
•Calculated Total Time is an estimate of the total battery backup time available, based on the initial battery condition and actual performance while powering the connected load during the discharge event.
•Calculated Time Remaining is a
•Battery Charge is the approximate percentage of total designed ampere hours of battery capac- ity presently available based on recharge/discharge activity.
Values for Calculated Total Time and Calculated Time Remaining will appear on the screen approxi- mately two minutes after the beginning of the discharge event. Calculated Time Remaining also appears on the Present Status Report screen. Both Calculated Total Time and Calculated Time Remaining will be updated every six seconds, reflecting actual load changes and battery condition. When the Calculated Times become available, they will be displayed in place of the Battery Discharg- ing message on this screen.
Figure 36 Battery time screen (45-minute discharge)
500 | VDC |
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| SELECT : MASTER MENU | |||
480 |
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| Low Battery Warning | ||
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|
| Calculated Time (Hrs:Min) | |||
460 |
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| Total 00:45 Remain | 0:01 | |
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440 |
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420 |
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400 |
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380 |
| Battery Shutdown = 417 |
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360 |
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| Rated Time (Hrs:Min) | ||||
| Battery Charge = 3% |
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| Total 00:25 Remain 0:00 | |||||
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340 | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
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Time (Minutes)
45
