APC Back-UPS 1250 User Manual download pdf (Page 21)

Page 19

5.0 Operation

5.2 Battery capacity bar graph

The battery capacity bar graph continuously displays the state of battery charge. In the

above example, the display shows that 100% of rated battery capacity is available.

Where power quality is fair, the UPS will be able to maintain the battery at 100% of rated

capacity. In the event of an extended utility failure, the capacity shown will decrease at

a rate dependent on the load drawn from the UPS. Large computer loads will cause the

battery capacity indication to fall at a faster rate. When low battery conditions are

reached, the bottom-most bar will blink. Once normal line voltages are restored, the

UPS will recharge the battery and the capacity bar graph will show an increasing

number of illuminated bars.

5.3 Output power bar graph

The output power bar graph displays the power drawn from the UPS as a percentage

of the UPS's full rated capacity. This example shows that the load equipment is drawing

between 67% and 85% of the UPS's rated capacity. If this were a 1250VA UPS running

a computer load, then the above would correspond to between 840 VA and 1060 VA (590

Watts and 740 Watts at 0.7 power factor). This is a typical installation. When the UPS

is loaded such that five bars are illuminated, thoroughly test your complete system to

be sure the UPS will not become overloaded. A thorough test includes running backup

tape drives, disk drives, etc. If the UPS becomes overloaded, the overload bar will

illuminate and the UPS will sound an alarm.

100%

80%

60%

40%

20%

Low battery

when blinking

Overload

85%

67%

50%

33%

17%

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APC Back-UPS 1250 User Manual Page 21