APC Back-UPS 1250 User Manual download pdf (Page 22)

Page 20

5.0 Operation

5.4 Line voltage bar graph

The line voltage bar graph displays the UPS's input voltage in discrete steps. Line

voltage is displayed when the I/Test pushbutton is pressed and held. The example

above shows that the UPS's input line voltage is between 116 and 123 Vac (120 Vac

version UPS, see table for values for other versions). If no bars are illuminated, and the

UPS is plugged into a known working wall outlet, the line voltage is extremely low. Low

input voltage could be a result of an overloaded branch circuit, a misadjusted service

pole transformer or intentional local service brownout. The UPS will compensate for

this problem by boosting the load voltage supplied to your computer equipment. If all

six bars are illuminated, the line voltage is high and should be checked by a qualified

electrician.

5.5 Audible alarm

The UPS contains a beeper that emits sound through the ventilation openings. Events

that cause the beeper to sound are listed below.

5.5.1 On-battery operation

The UPS emits four short beeps every 30 seconds following failure of the utility. The

audible alarm is silenced until the next utility failure when the I/Test pushbutton is

pressed.

5.5.2 Low battery

During an extended utility failure, the UPS will eventually emit continuous beeps to

indicate that less than 2 minutes (or 5 minutes, see section 5.6) of run time remain before

shut down due to battery capacity exhaustion. The low battery warning cannot be

muted.

Bar increments versus version type

100 Vac 120 Vac 208 Vac

220/230/

240 Vac

116 130 237 260

109 123 225 246

102 116 212 232

96 110 200 220

90 104 187 208

84 98 175 196

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 43 44

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APC Back-UPS 1250 User Manual Page 22