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Using the configuration program, the user may specify the number of external battery cabinets
attached to the UPS. The factory default is programmed for internal batteries only.
Table 14 shows the estimated run times at different loads.
12.1 Auto-Learning Battery Run Times
As batteries age, the estimated runtimes may become less accurate. The Liebert
®
GXT3 is pro-
grammed to “learn” from a full battery discharge and modify the estimated run time for the measured
battery capacity. This can improve accuracy and compensate for aging batteries or batteries that
operate at different ambient temperatures.
The UPS will update the anticipated run time calculation only under certain conditions.
• The UPS must have a steady load that is greater than 20%.
• The UPS must be at 100% charge at the start of a battery discharge.
• The battery discharge must continue uninterrupted until the batteries reach their end-of-dis-
charge voltage.
If all conditions are not met, the run time calculation will not be modified.
If the configuration program is used to change the number of battery cabinets, then the values in
Table 14 will be restored. This will override any value that is Auto-Learned.