EnerSys OutBack POWER Mojave OGHI8048A, Operator'S Manual

Page: 69 / 116

900-00275-01-001 Rev A
69
Operation
Absorption Timer
Time limit: Absorb time (m) setting. This is reset to its maximum amount whenever the battery
voltage decreases to the Rebulk voltage (V) setting. The reset occurs immediately, regardless of
the duration spent below this voltage.
If the battery voltage does not decrease to the Rebulk point, the
Absorb time (m) setting will not
reset. It will retain any remaining time from the previous cycle. The Absorption stage will only last
for the duration of the remaining time.
The remaining charging steps proceed as described on the previous pages.
Figure 35 Repeated Charging (1
st
, 2
nd
, and 3
rd
Cycles)
Example of Multiple Cycles
In Figure 35 (Cycle 1), the charger begins a new cycle by entering Bulk stage and proceeding through
Absorption. When the Absorption timer expires, the charger goes to the Idle condition. The battery
voltage decreases naturally for an indefinite period.
When the battery voltage decreases to the level of the Rebulk setting, the charger begins a new cycle,
Cycle 2. It re-enters Bulk stage. The Absorption timer resets to maximum.
During Cycle 2, the charger is interrupted by the loss of AC input. With loads being supported, the battery
voltage decreases. In this example it does not reach the level of the
Rebulk setting.
Cycle 2 resumes when the AC input is restored. The charger returns the batteries to the Absorption
setting. During the power loss, the battery voltage did not decrease to the
Rebulk
setting, so
Absorption
Time (m)
retains the remainder of the previous cycle. When the remaining Absorption time expires, the
charger goes to the Idle condition. The battery voltage decreases naturally for an indefinite period.
When the battery voltage decreases to the level of the Rebulk setting, the charger begins a new cycle,
Cycle 3. The Absorption timer resets to maximum. The charger re-enters Bulk stage and proceeds
through Absorption. When the Absorption timer expires, the charger goes to the Idle condition. After
that, it will continue alternating between the Rebulk, Absorption, and Idle steps indefinitely.
Time
Absorption
timer runs
No Charge Idle
Absorption
timer resets
Abs.
timer
runs
(part)
Absorption
timer runs
(remaining time)
Absorption
timer runs
(complete)
Absorption
timer resets
Voltage
Absorption
Set Point
Rebulk
Set Point
Cycle 1
Cycle 2
Inverter now charging to a new
set point
Inverter has reached the charging
set point 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
Remainder
of Cycle 2
Cycle 3
Abs.
(start)
Idle
Idle Bulk
Absorption
(full)
Bulk
AC
Loss
Absorption
(end)
Bulk
Absorption
(full)