Liebert 30-130kVA manual Seconds Discharge Cycles, Summary, Time Down

Operation

Selecting the TIME button will display the time stamp of each cycle for three seconds after which it repaints the column with DATE stamps again.

Figure 99 0-30 seconds discharge cycles

0 - 30 SECONDS DISCHARGE CYCLES

#	DATE	SEC	MIN-DC	MAX-A	KWH	C
4	04/26/01	21	443	100	1	25
1	02/09/01	25	439	89	1	24
	TIME		DOWN	UP	EXIT

SUMMARY PAGE LAYOUT

The Summary Page Screen is accessed from the Battery Cycle Monitor Screen. The BCM summary page includes the following information:

Accumulated number of all discharge cycles. Accumulated or active time on battery. Accumulated or active battery AMP hours. Accumulated or active battery KW hours.

The upper range of all the accumulated numbers is kept in two long integers to make certain they don’t overflow.

Figure 100Summary page screen

SUMMARY PAGE

ACCUMULATED NUMBER OF CYCLES	4
ACCUMULATED BATTERY TIME (SEC)	184
ACCUMULATED BATTERY AMP HOURS	6
ACCUMULATED BATTERY KW HOURS	3

EXIT

DISCHARGE CYCLE DETECTION / RE-ARMING METHOD

A battery discharge cycle starts with the reversal of battery current (discharge AMPS). The discharge current has to be greater than 2% of battery discharge rating. The cycle is terminated and re-armed (reset conditions for next cycle) when battery current enters the Normal operating range of +/- 1%.

The normal range is displayed as NORM in the battery section of the one-line Mimic screen. When battery current exceeds 1% in the positive direction, the displayed status is changed to CHG (charge) and when drops in the negative direction by more than 1%, it is displayed as DIS (discharge). Battery AMPS resolution is 0.1.

When an End of Discharge condition occurs (fault “BATT LOW TRANSFER”), the cycle is terminated, cycle and summary data saved, and the cycle is re-armed. The same thing happens in the event of a loss of communications with UPSC (alarm UPSC-MM COMM FAIL.”) After approximately 10 sec- onds, the BCM is re-armed for the next cycle.

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