Product Manual

Operation
32 900-0145-01-01 Rev B
Figure 6 Repeated Charging Cycles
Example of Multiple Cycles

In Figure 6 (Cycle 1), the charger initially completes Absorption. When the Absorption timer expires, the
charger goes Silent until battery voltage decreases to the
Re-Float
setting. The Float timer is reset to its
maximum. The charger enters Float and proceeds until it is interrupted by a loss of AC power.

Cycle 2 begins when the AC source is restored. During the AC loss, the battery voltage did not decrease to
the
Re-Float
setting, so
Float Time
retains the remainder of the previous cycle. The charger returns to Float
and completes the stage when its timer expires. It then goes Silent.
During the Silent period, AC is lost again. The battery voltage decreases until it reaches the Re-Bulk set
point. This causes the charger to prepare a new three-stage cycle from the beginning, but it cannot do so
until the AC source is restored.
In Cycle 1,
Absorb Time
had expired. It was not reset afterward and retained a “remaining run time” of zero.
Whenever the battery voltage decreases to
Re-Bulk
or lower, the Absorption timer will begin accumulating
run time. The first set of arrows below the graph show the length of time accumulated on the Absorption
timer at the end of Cycle 2.

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 amount of time spent in this stage is equal to the amount of time
accumulated at the end of Cycle 2. (The space between the first and second set of arrows is the same.)
Absorption ends when the timer expires.
This means that the length of Absorption may be shorter than the
Absorb Time
setting. During intermittent
AC loss, the batteries may not be used enough to require a total recharge.
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 (when the batteries exceeded the
Float Voltage
setting), the
Float
Time
has also expired. The charger does not enter 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 accumulates run time while the batteries are
below this set point.
The first set of barred arrows below the graph show the length of time accumulated on the Absorption
timer. Note that the timer stops accumulating well before the beginning of Cycle 4 when the AC source is
restored. The accumulation of the Absorption timer cannot exceed the
Absorb Time
setting.

When Cycle 4 begins, the charger proceeds through the Bulk stage and then the Absorption stage. (The
space between the first and second set of barred arrows is the same.) The duration of Absorption is equal to
Absorb Time
, which is the maximum time allowed. At the end of Cycle 4, the
Float Time
has expired, so the
charger goes Silent.
Voltage
Bul
k
(c.c.)
Absorption
Set Point
Float
Set Point
Re-Float
Set Point
Re-Bulk
Set Point
Time
Absorption
(c.v.)
Absorption
(c.v.)
Absorption (c.v.)
AC Loss
Float
(c.c.)
AC Loss
Bul
k
(c.c.)
Silent
Silent
Float
Timer
(c.v.)
Float
(c.c.)
Float
Timer
(c.v.)
Silent
Silent
AC Loss
Timer
accumulates
Timer
accumulates
Timer
runs
Timer
runs
T
imer runs
C
y
cle 4
C
y
cle 1
C
y
cle 3
C
y
cle 2