72 | SAMLEX AMErICA INC.
this stage is displayed as "n-CC" in the Charging Mode screens in the remote Control
eVo-rC (Please see Section 3.6.1 of the attached owner's Manual for eVo-rC at Appendix A).
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
Absorp
- 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”)
Fig 5.1 Charging Curve for normal 3 Stage Charging
The value of the "bULK CUrrENT" (“Io”) depends upon the total Ampere Hour (Ah) capacity
of the battery or bank of batteries. A battery should never be charged at very high charging
current as very high rate of charging will not return the full 100 percent capacity as the Gassing
Voltage rises with higher charging current.
As a general rule of thumb, the bulk Charging
Current “io” should be limited to 10% to 20% of the Ah capacity of the battery (20 hr
rate).
Higher charging current may be used if permitted by the battery manufacturer.
Programmable range and Default values of "bULK CUrrENT" (“Io”) are shown in Table 6.2.
The units are shipped with the "bULK CUrrENT" set at the Default Value of 40A.
When the unit enters Charging Mode, it starts working as a battery charger and the charger
will run at full programmed "bULK CUrrENT" until the charger reaches the programmed
Absorption Voltage.
As part of the Adaptive Charging Algorithm, a software timer will measure the time taken from
the instant the unit enters the bulk Charging Mode until the instant the battery voltage reaches
0.3V below the programmed Absorption Voltage, then registers this time as bulk Charge Time
To and computes the Absorption Time T1 as 10 times the bulk Charge Time To in the internal
“T1 Timer” i.e. T1 = To x 10. The “T1 Timer” is used to determine the time the charging will
take place in the next Absorption Stage.
5.6.1.1 Automatic Adjustments of internal AC Charger Current when external
Charger is also Charging in Parallel
Please note that if an external charger is also used to charge the batteries at the same time in
parallel with the internal AC charger of the unit [through input terminals marked EXT.charger -
(3,4 in fig 2.1)], the charging current of the internal AC charger will be controlled so that the total
charging current of the external charger and the internal charger is = the programmed "bULK
CUrrENT (“Io”).
for example, if the programmed "bULK CUrrENT (“Io”) is say 40A and the charging current of
the external charger is 30A, the internal AC charger will output only 10A (Programmed setting
of 40A – external charging current of 30A = 10A). Similarly, if the programmed setting is say
30A and the external charger is 50A, the internal AC charger will
not
provide any charging.
Please refer to Section 5.4 for more details.
SECTIOn 5 |
Battery Charging in Evolution
TM
Series
