Alpha OutBack Power Radian Series Operator's Manual page 33

Cycle 3
AC Loss
Bulk
Absorption
Set Point
Float
Set Point
Re-Bulk
Set Point
Absorption Absorption
timer resets timer runs
Inverter now charging to a new
set point
Inverter has reached the charging
set point
Figure 5
Prior to the beginning of Cycle 3, the AC source was lost. The battery voltage decreased below
the level of the Re-Bulk set point. Whenever this occurs, the Absorption timer resets to its
maximum amount.
In Figure 5, Cycle 3 begins when the AC source is restored again. The charger begins a new cycle
by entering Bulk stage. When it enters Absorption, the timer runs until it is interrupted by a loss of
AC power.
Following Cycle 3, the voltage does not decrease below Re-Bulk. The Absorption timer retains the
remaining time from Cycle 3.
Cycle 4 begins when the AC source is restored again. The charger enters Bulk stage and proceeds
to Absorption. This stage does not last for the full duration of the Absorb Time setting. The timer
uses up the remaining time from Cycle 3. Absorption ends when the timer expires.
In this example, the duration was also longer than the Float Time setting. Because the Float timer
began running near the beginning of Cycle 3 and also Cycle 4 (when the batteries exceeded the
Float Voltage setting), the Float Time has also expired. The charger does not enter Refloat or Float
and goes Silent.
During the Silent period, AC is lost again. The battery voltage decreases until it reaches the Re-Bulk
set point, prompting a new charge cycle. The Absorption timer resets to its maximum amount.
When Cycle 5 begins, the charger proceeds through the Bulk stage and then the Absorption stage.
At the end of Cycle 5, the Float Time has expired, so the charger goes Silent.
900-0161-01-01 Rev B
AC Loss
Abs. Bulk
(part) (remaining time)
Inverter completed charging; the previous set point
is no longer in use
Inverter waiting to charge when AC restored;
the previous set point is still in use
Inverter waiting to charge when AC restored;
a new set point is in use
Repeated Charging (3
Cycle 4
AC Loss
Absorption Silent
Absorption Absorption
timer runs timer
resets
, 4 , and 5
rd th
Operation
Cycle 5
Bulk Absorption
Absorption
timer runs
(complete)
Cycles)
th
Silent
33