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Technical Manual
FT420
– Iss 2.4
22
2.4 Battery Charger Current Limiting Board SUB945
B-
B+
V-
V+
TE R MIN A LS
TO B A TTE R Y
B A T O U TP U T
FR O M C .I.E .
P
C
B
2
9
9
R
0
MAX CHARGING CURRENT
BATTERY CONFIGURATION
* <= 7AH - 500 mA
* <= 17AH - 1000 mA
* <= 26AH - 1500 mA
* <= 7AH - Remove R5, R6
* <= 17AH - Remove R6
* <= 26AH - Install R5, R6
+
S
e
ria
l N
o
.
S
U
B
9
4
5
R
0
TB1
U1
Q2
C1
R7
R6
R5
R4
R3
R2
R1
Z2
Z1
B
R
O
O
K
S
Q1
D2
D1
Figure 4 Battery Charger Current Limiting board layout (SUB945)
The Current Limiting Board is used only to limit the charging current to the batteries. Refer to FT420
Block Wiring Diagram Figure 39 page 76 for connection details. Termination details are shown on
Table 9 below.
Table 9 Battery Charger Current Limiting Connection
Designator Type
Pin Usage
Lab Description
TB1
Removable
Screw
Terminals
1
Connection from the
Battery terminals on the
main control board (TB1).
V+
Battery output on the main control
board is connected to current
limiting board to limit the
maximum charging current.
2
V-
3
Connection to Batteries
B+
4
B-
The two resistors R5 and R6 control the maximum charging current versus the battery capacity
depending on the resistors configuration. Table 10 below shows the configuration of R5 and R6 for the
three battery sizes in the table.
Note:
Default setting for R5 and R6 is to fit only R6, this covers 7-17 AH batteries. For 26 AH
batteries, R5 should be fitted beside R6
.
Table 10 Battery Capacity / Max Charging Current
Designator
PCB Configuration
Max Battery Capacity Max Charging Current
R5 & R6
R5 & R6 Not fitted
7 AH
500 mA
R6 Fitted
17 AH
1000 mA
R5 & R6 fitted
26 AH
1500 mA
Содержание Firetracker FT420
Страница 1: ...TECHNICAL MANUAL Issue 2 4 FT420 Conventional Fire Alarm System MA425 Oct 2018 ...
Страница 76: ...Technical Manual FT420 Iss 2 4 76 6 3 FT420 Block Wiring Diagram Figure 39 FT420 with All Options ...
Страница 77: ...Technical Manual FT420 Iss 2 4 77 Figure 40 FT420 with Gas Kit Interface ...