Samlexpower EVO-2212E Owner's Manual - Normal Charging
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current from the external charging source is limited to 50A .This limit should not be exceeded!
Please note that Lead Acid batteries should not be charged at very high charging currents
to prevent adverse effects like reduction in returned capacity, excessive surface charge,
overheating, excessive pressure build up in sealed batteries (generation of Oxygen and
hydrogen will be > recombination) etc. Normally, the maximum charging current is limited to
20% of the Ah capacity of the battery unless the battery manufacturer allows higher charging
current. When a battery is charged simultaneously by multiple charging sources, all the charging
currents will add up and may result in very high charging current with respect to the Ah
capacity of the battery.
the charging current fed from the external source is measured and the charging cur-
rent generated by the internal charger is automatically controlled to ensure that the
net charging current fed to the battery does not exceed the net programmed bulk
charge current “Io”.
5.5 battery temperature Sensor
A battery Temperature Sensor Model EVO-bCTS has been provided [fig 2.5(a)]. It comes
with 5 m / 16.5 ft cable. Connect the ring terminal end (houses the sensor) on the battery
Positive or Negative post [fig 2.5(b)]. Connect the rJ-45 plug to the Temperature Sensor Jack
(6, fig. 2.1). The Temperature Sensor is used to ensure optimum charging by modifying the
charging voltages based on temperature if the battery sees very wide temperature swings.
In addition to compensating the charging voltages, the thresholds of “LOW VOLT ALArM”,
“bATT LOW VOLTAGE” shut down, “rESET VOLTAGE” and “bATTEry OVEr VOLT” are also
temperature compensated. Temperature compensation will be carried out over a temperature
range of –20°C to + 60°C. 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
charging 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
Charging 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 6.2.
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
SECTIOn 5 |
Battery Charging in Evolution Series