Liebert 30-130kVA Battery Cycle, Battery Duration, MIN MAX Weeks, Seconds, Battery Equalizer

Operation

To enable the Auto Battery Self Test, Select “Auto Test Enable” from the Battery Test screen. Next, set the Date and Time at which the first test will be performed. Set the Test Cycle period in weeks. (The range is 2-9 weeks and the default is 2 weeks.) Finally, set the Test Duration time in seconds according to the table above. The range is 30-900 seconds and the default is 60 seconds. Use the UP DOWN navigation buttons to change the cursor position when setting battery parameters.

Figure 86 Set battery cycle screen

BATTERY CYCLE

MIN 2

2

MAX 9

WEEKS

Figure 87 Set battery duration screen

BATTERY DURATION

MIN 30	MAX 900
	SECONDS

Battery Equalizer

In order to prolong battery life, the Npower system provides a User-programmable setting after each battery discharge. The equalize setpoint is typically set to a higher float voltage.

When the input utility power is interrupted, the battery supplies DC power to the inverter so there is no interruption of power to the critical load. When the AC input power is restored, the battery equal- ize recharging circuit can be activated automatically or manually to increase the rectifier/charger out- put voltage to recharge the battery. The battery equalize circuit may also be manually activated at any time during normal float (constant) voltage operation. The equalizing time can be adjusted from 0 to 72 hours. The default setting is 0. A setting of 0 is interpreted as if the feature were disabled.

The Battery Equalize screen The battery equalize screen lets the operator change the battery equalize recharging mode from manual to automatic, and to observe or change the equalize time. To access this screen go to the MAIN MENU, highlight BATTERY MANAGEMENT, and press SELECT. This brings up the Battery Management screen. Highlight BATTERY EQUALIZER and press SELECT. The Battery Equalizer Screen (Figure 88) will appear.

! CAUTION

The manufacturers of the valve-regulated batteries supplied with Liebert’s standard battery cabinets recommend that when first installed the batteries be equalize charged. After that initial equalize charge, they recommend no further equalize charging for their batteries. Other manufacturers may have different recommendations for their products. Consult the battery manufacturer’s manual for specific information about equalize charging.

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