Emerson GXT3 230V user manual Auto-Learning Battery Run Times

Specifications

Table 11 Typical battery run times, minutes at 25°C (77°F ), 100% resistive load

Number of					Load%
Batteries/ Cabinets	10%	20%	30%	40%	50%	60%	70%	80%	90%	100%
Internal Battery	105	52	40	27	21	17	14	12	10	9
Internal Battery
+ 1 External	187	106	78	53	47	40	34	28	23	21
Battery Cabinet
Internal Battery
+ 2 External	217	146	106	91	71	53	49	45	41	37
Battery Cabinets
Internal Battery
+ 3 External	360	188	132	106	95	79	68	53	50	47
Battery Cabinets
Internal Battery
+ 4 External	360	205	159	124	106	98	83	75	66	53
Battery Cabinets

Using the configuration program, the user may specify the number of Liebert® external battery cabinets attached to the UPS. The factory default is programmed for internal batteries only.

See Table 11 shows the estimated run times at different loads.

12.1Auto-Learning Battery Run Times

As batteries age, the estimated runtimes may become less accurate. The Liebert GXT3™ is programmed to “learn” from a full battery discharge and modify the estimated runtime 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 the battery above table will be restored. This will override any value that is Auto-Learned.

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