Apc 2000XL User Manual download pdf (Page 23)

Page 21

5.0 Operation

Note: Option switches may

be thrown at any time and

take effect immediately.

5.5.3 Replace battery

In the event the UPS's battery fails a battery test, the UPS will emit "chirps" for a period

of 1 minute. If the UPS is left operating while in this condition, the UPS will emits chirps

once every 5 hours until a successful battery test is completed.

5.5.4 Overload

The UPS will emit a loud, sustained tone when overloaded. When an overload is applied

while on-line, the alarm will sound until the overload is removed. If the overload is

applied while on-battery, the alarm will sound until the UPS Enable control is switched

off.

5.6 Option switches

5.6.1 Option switch 1

The UPS contains utility fault detection circuitry that is extremely sensitive to line

voltage distortions including spikes, notches, sudden dips and swells. The UPS is factory

set to react to such line voltage distortions by transferring the load immediately to on-

battery operation. This affords maximum protection for all load types. Where power

quality is poor due to local cyclic heavy load switching or use of inexpensive fuel

generators, the UPS may be caused to transfer to on-battery operation very often. If the

UPS is powering loads that are known to operate normally under such conditions, such

behavior is undesirable as battery capacity is being spent unnecessarily.

The user may set Option switch 1 to the on ( I ) position in order to desensitize the UPS

to rapid low amplitude line voltage fluctuations. When this is done, the UPS's upper

transfer voltage is also increased by 3%, for a total of 13% above the nominal input

voltage. This allows the UPS's battery charger to maintain maximum possible battery

capacity, saving it for gross utility failures.

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Apc 2000XL User Manual Page 23