Emerson Series 610 manual Battery age Excessive battery discharge/recharge cycles

Operation

The Liebert Series 610 dynamically adjusts the Battery Shutdown voltage based on battery charac- teristics and the length of the current discharge event. If a discharge event extends past 15 minutes (i.e., the load is less than the full design rating), the Battery Shutdown voltage setting is gradually and automatically increased, to protect the batteries from deep discharge.

When the battery voltage decreases to a preset limit (see 3.2.7 - Alarm Limit Settings Screen), the Low Battery Warning alarm message appears on the display screen. This warns the operator that the battery voltage is approaching the Battery Shutdown level—about five minutes of time remaining at full rated load.

NOTE

The Low Battery alarm setting is designed to be useful at full load battery discharge rates. Unlike the Battery Shutdown voltage, the Low Battery alarm setting is not automatically increased and should not be relied upon as an indicator of battery time remaining. Instead, the operator should consult the Battery Time screen or Present Status screen to see the Calculated Time Remaining based on actual usage during the discharge period.

If the battery discharges to the Battery Shutdown level, represented by the lower line on the Battery Time screen, the battery and input circuit breakers trip open and the UPS module is shut down. This protects the battery from being damaged by an extended deep discharge.

! 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.

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.

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:

•Battery age

•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.

The Liebert Series 610 records information about each discharge event. This data can be reviewed on the Battery Cycle Monitor screen, as described in 3.2.5 - Status Reports Screens.

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