Apc 2000XL User Manual download pdf (Page 22)

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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 the UPS will soon shut down due to battery capacity exhaustion. The low

battery warning cannot be muted.

Bar increments versus

version type

120 Vac 208 Vac

220/230/

240 Vac

130 237 260

123 225 246

116 212 232

110 200 220

104 187 208

98 175 196

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Apc 2000XL User Manual Page 22