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64 Operation
Figure 43 Range of Values for Calculated Battery Times
If the Battery Time screen is displayed while the battery is not discharging, it will display the present Battery
Charge percentage and the results of the previous discharge event.
The Series 600T records information about each discharge event. This data can be reviewed on the Battery Cycle
Monitor screen, as described in 3.1.4 - Status Reports Screens.
CAUTION
When battery shutdown occurs, no power will be supplied to the critical load
unless power is available through the bypass line from the utility source (or from
an engine generator set). If you anticipate a battery shutdown (and an engine
generator set is not available), either transfer the load to bypass (if available) or
perform a controlled shutdown of the critical load.
NOTE
1. During initial UPS start-up, the Battery Charge will display 100%, even though
actual state of charge may be slightly less. It will normally take three to four days
of operation to completely charge the battery. After the battery is fully charged
the first time, Battery Charge will be an accurate indication of battery status.
2. If Calculated Time Remaining is less than Rated Time Remaining, a battery
problem may be indicated. Battery maintenance personnel should thoroughly
examine the battery plant for factors that may reduce battery performance, such
as:
• Age of battery
• Excessive battery discharge/recharge cycles
• Bad or weak cells
• Low acid levels in flooded cells
• Loose electrical connections
• Ambient temperature extremes
• Dirty battery jar covers.
3. If the battery plant has been thoroughly examined for proper maintenance and
condition, and the Calculated value is still less than 80% of Rated value, contact
Liebert Global Services.
0
5
10
15
20
25
2.5 5 7.5 10 12.5 15 17.5 20 22.5 25
Elapsed Time (Minutes)
Calculated Time Remaining
UpperLimit Actual Lower Limit