Liebert 1000kVA - Manual (Page 68)

Operation
62
3.2.13 Battery Equalize Screen
Go to the Master Menu and move the highlighted cursor to BATTERY EQUALIZE. Press the Select
pad and the Battery Equalize screen is displayed.
The Battery Equalize screen enables the operator to adjust the battery equalize time. It is also used to
choose between auto and manual battery equalize recharging modes. Note that AUTO MODE can be
selected only from the System Control Cabinet (SCC). Selections made at the SCC override previous
selections made at the UPS modules.
When the input utility power is interrupted, the battery supplies DC power to the UPS module invert-
ers so there is no interruption of power to the critical load. When the AC input power is restored, the
battery equalize recharging circuit can be activated automatically or manually to increase the module
rectifier/charger output voltage to recharge the battery. The battery equalize circuit may also be man-
ually activated at any time during normal float (constant) voltage operation. The equalizing time can
be adjusted from 0 to 72 hours.
Figure 50 Battery equalize screen
EQUALIZE TIME PERIOD. This selection permits the operator to adjust the battery equalize time
in one hour increments from 0 to 72. The battery equalize time must be greater than zero for the bat-
tery to begin recharging in both the AUTO and the MANUAL modes. This period is set by use of the
Up/Down pads and Select pad.
When the battery is at full voltage (not being recharged), this selection reads EQUALIZE TIME
PERIOD (hrs). When the battery is recharging, this selection reads EQUALIZE TIME REMAIN-
ING (hrs). After the equalize recharge time has expired, the indication returns to the preset equalize
time.
STOP EQUALIZE CHARGE. This selection lets the operator halt the equalizing charge to the bat-
tery at any time, whether the circuit was activated automatically or manually.
MANUAL MODE. This mode enables the operator to manually initiate a battery equalize charge to
raise the DC bus voltage to correct a non-uniformity in the individual cell voltages or specific gravity
readings.
AUTO MODE (SCC only). When the battery recharge control logic is in the AUTO MODE, the UPS
module battery chargers attempt the equalization process only if the EQUALIZE TIME PERIOD is
greater than zero, the battery voltage has been at or below the Battery Discharging alarm limit for
longer than 30 seconds and the battery breakers (MBD) are closed.
!
CAUTION
Do not use the Battery Equalize mode if you have valve-regulated, sealed-cell
(maintenance-free) batteries. Refer to your battery manufacturer’s manual,
available on the manufacturer’s Web site.
EXIT
SECURITY ACCESS
BATTERY EQUALIZE RECHARGING
0
NO
NO
YES
NO EQUALIZE TIME PERIOD (hrs.) ...........
STOP EQUALIZE CHARGE ...................
MANUAL MODE .....................................
AUTO MODE ..........................................
MANUAL / RESET TO AUTO MODE ......
CURSOR UP
CURSOR DOWN
CHOOSE
UP :
DOWN :
SELECT :
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