Table des Matières
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seCtIOn 4 |
30
28
26
24
22
20
18
27.5
16
25.0
14
22.5
12
20.0
17.5
10
15.0
8
12.5
10.0
6
7.5
4
5.0
2
2.5
0
0
AMPS VOLTS
i
inFo
Fig xxx - SEC-2425UL Charging Curves (Absorption 28.8V, Float 27V)
Please note the following important information related to the charging curves
shown in Figs 4.1 and 4.2 above:
1.1 terminal Voltage reading on no load and on load: The output terminals of the
charger consist of one common Negative terminal (3) and two Red Positive terminals
(1, 2) for charging two banks of batteries. Each of the two Positive terminals of the
two banks has Schottky Diode in series for isolation. These isolating diodes have a
current dependent forward voltage drop Vf ranging from 0.2 to 0.3V (at 0.1A) to
0.6V (at 80A). In addition, there will be additional forward drop Vb across the bulk
resistance of the diode and this drop will also increase with increase in charging
current. Please note that the forward voltage drops Vf and Vb occur only when cur-
rent flows through the diode.
1.2 The Float and Absorption voltages are tightly regulated before the isolating
diodes. However, the voltages available at the terminals of the two banks will vary
with the value of the charging current because of the current dependent forward
voltage drop Vf and bulk resistance drop Vb. The Float Voltage before the diodes is,
Principle of Operation
Stage 1
"I Phase"
28.8V
27V
B1
A1
B2
40A
A2
80% of
current
capacity
of charger
(32 amps)
Time, Hours
Fig. 4.2 Charging Curve for SEC-2440UL
Stage 2*
"Uo Phase"
Voltage
Voltage
D1
curve
curve
C1
C2
D2
10% of
current
capacity
of charger
(4A ± 0,5A)
Stage 3
"U Phase"
E1
Current
curve
E2
* Stage 2 time for 4 or 8 hours.
SAMLEX AMERICA INC. | 9
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