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990-7031C, Revision 4 12/99
8
Charge the battery
The UPS charges its battery whenever it is connected to utility power. The battery will charge fully during the first four
hours of normal operation. Do not expect full runtime during this initial charge period.
Connect Computer Interface Port (Optional)
Power management software and interface kits can be used with this UPS. Use only kits supplied or approved by the
manufacturer. If used, connect the interface cable to the 9-pin computer interface port on the back panel of the UPS.
Secure the connector’s screws to complete the connection.
Caution:
DO NOT use a standard serial interface cable to connect to the Computer Interface Port on the UPS. Standard
serial interface cables are incompatible with the UPS connector. Use the cable provided with your UPS.
Connect Ground Leads to TVSS Connector (Optional)
The UPS features a TVSS connector for connecting the ground lead on transient voltage surge-suppression (TVSS)
devices such as telephone and network line protectors. The TVSS connector provides grounding through the UPS’s power
cord ground conductor. To make a connection to the TVSS connector, loosen the screw and connect the surge
suppression device’s ground lead. Tighten the screw to secure the lead.
Voltage Sensitivity
The UPS detects line voltage distortions such as spikes, notches, dips, and swells, as well as distortions caused by
operation with inexpensive fuel-powered generators. By default, the UPS reacts to distortions by transferring to on-battery
operation to protect the loads. Where power quality is poor, the UPS may frequently transfer to on-battery operation. If
the loads can operate normally under such conditions, battery capacity and service life may be conserved by reducing the
sensitivity of the UPS.
To reduce UPS sensitivity, press the configuration button on the rear panel. Use a pointed object such as a pen to
press the button. Press it once to set the UPS’s sensitivity to reduced. Press it again to set the sensitivity to low. Press
the button a third time to reset normal sensitivity.
Low Battery Warning Interval
By default, the low battery warning occurs when there are approximately two minutes of on-battery run time remaining.
This may not be enough time to gracefully shut down some protected computer systems.
To change the warning interval, press the rear panel configuration button while pressing and holding the front-panel
on/test button.
Battery Pack Connector (Optional)
Use the battery pack connector (on units that have one) to connect the optional external battery pack. See
Appendix A: XL Information, page 20, for instructions.
normal
reduced
low
When the UPS is set to normal sensitivity, the configuration LED is brightly lit.
When it is set to reduced sensitivity, the LED is dimly lit.
When it is set to low sensitivity, the LED is off.
2 min.
5 min.
7 min.
When the LED is brightly lit, the low battery warning interval is roughly 2 minutes. This is the initial setting.
When the LED is dimly lit, the low battery warning interval to approximately five minutes.
When the LED is off, the low battery warning interval is approximately seven minutes.
Press the button a third time to reset the interval to two minutes.