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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
Figure 87 Set battery duration screen
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.
BATTERY CYCLE
MIN 2 MAX 9
WEEKS
2
BATTERY DURATION
MIN 30 MAX 900
SECONDS