72 | SAMLEX AMERICA INC.
Table 5.1 shows the programmable range. Default settings for the temperature coefficient is
-4mV/°C/Cell.
5.6 3 STAGE CHARGING MODE: BULK, ABSORPTION & FLOAT FOR
NORMAL CHARGING
Normal day to day charging is performed in a 3 Stage Cycle—BULK, ABSORPTION and FLOAT—
to provide rapid and complete charge cycles without undue battery gassing. Please see Table
6.2 for details of programmable settings and Default Values. This 3 Stage Charging is the
Default Charging Mode.
Fig. 5.1 shows the voltage and current charging curves with respect to time and different charg-
ing stages.
NOTE:
With the optional Remote Control Model EVO-RC (see Appendix A), it is possible to
program and activate 4 Stage Charging Mode including the 4th Equalization Stage. 4-Stage
charging is required to be carried out only on flooded / wet cell batteries. This 4 Stage Charg-
ing Mode is discussed separately under “4 Stage Charging Mode in Equalization Mode” at
Section 5.7.
5.6.1 Bulk Charge Stage
In the first stage, known as the Bulk Charge Stage, the charger delivers the maximum Bulk
Charge Current “Io” that has been programmed through the “Parameter Setting Menu” of
the optional Remote Control Model EVO-RC. Range and Default value are shown at Table 5.1.
This current is delivered to the batteries until the battery voltage approaches its Gassing Voltage
(Absorption Voltage)—typically around 14.4 volts for 12 volt batteries and 28.8 volts for 24
volt batteries (again, this voltage can vary based upon the desired values programmed through
the “Parameter Setting Menu” of the optional Remote Control Model EVO-RC (see Appendix
A)). The Bulk Charge Stage restores about 75% of the battery’s charge. The Gassing Voltage
is the voltage at which the electrolyte in the battery begins to break down into Hydrogen and
Oxygen gases. Under normal circumstances, a battery should not be charged at a voltage above
its Gassing Voltage (except in the manually selected Equalization Stage) since this will cause the
battery to lose electrolyte and dry out over time.
This stage is displayed as "N-CC" in the Charging Mode screens in the Remote Control
EVO-RC (Fig 3.2, Appendix A).
Fig 5.1 Charging Curve for Normal 3 Stage Charging
SECTION 5 |
Battery Charging in Evolution Series
15
14
13
12
11
10
Char
ger V
oltage
, VDC
TIME
To
T1
10 Days
CURRENT (%) of S
et Bulk
Char
ge C
ur
ren
t
“Io
”
100%
60%
0%
BULK
ABSORPTION
FLOAT
Voltage Curve
Current Curve
LEGEND
V
Boost
- 0.3V
Note 1:
The voltage curve
shows the voltage output of
charger. The intrinsic battery
voltage may be different and
will be proportional to the
state of charge.
Note 2:
The graph is for 12V
version. For 24V version,
double the voltages.
I
o
(Displayed as “N-CC”) (Displayed as “N-CV”) (Displayed as “Float”)
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