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4.4 Battery charger(BC-6158)
4-14
V
I
28V
4.4.3 Battery charger (BC-6158)
Battery charger BC-6158 can charge clad type or pasteboard vent type batteries of up to
300 AH. It is a constant voltage/current charger which supplies a constant voltage of 28
V and a constant charging current of 20 A (30 A).
The power supply to the charger is connected to a tap of transformer T1 which is
selected according to the supply voltage.
The maximum charging current differs according to the capacity of the battery to be
charged. For example, for a battery of 200 AH the maximum charging current is 20 A
and for a 300 AH battery the current is 30 A. VR2 adjusts the maximum current to 20 A
or 30 A. VR1 adjusts the output voltage of the charger to 28 V. The thermal sensor is
mounted on the heat radiator of the charger, and it operates when the sensor detects a
temperature of 60 degrees.
20A(30A)
Fig. 4.4.4
Fig. 4.4.5 BC-6518 block diagram
110V
100V
0V
110V
100V
0V
K1
T1
U1/U2
Q1
Q4/Q5
CR3/Q3
Q2
VR1
VR2
30A
Breaker
CP1
FAN
S1
6o degrees
thermal sensor
FM1
CR2
TB 1
AC IN
TB 3
TB 2
(1, 2)
24V 5
CHARGE 6
0V 7
1 BATT+
2 BATT-
TB 3
1 BATT+
2 BATT-
3 BATT+
4 BATT-
R1,2,3,4
Full wave rectifier
Power conrol
Over current
detector
Voltage error
detctor
AMP.
05P0659 board
VR2
(Over current ADJ. VR:
Adjust to 20A)
VR1
(Over voltage ADJ. VR:
Adjust to 28V)
S1: 60 degrees
thermal sensor
Fig. 4.4.6 BC-6158 left side