Battery Charger
Operation | en
27
Bosch Security Systems B.V.
Installation and Operation manual
180110011Aa | V1.1 | 2011.05
8
Operation
8.1
Working principles
8.1.1
Battery test
The battery presence test is performed in the following manner:
The battery presence is tested every 30 seconds until 20 minutes after commissioning and
every 15 minutes after. If battery absence is detected a fault is generated (refer to section
3.4.1
).
The Ri (internal resistance) is measured every 4 hours if the mains is present on the battery
charger and if the output current is < 12A. If the Ri threshold level is exceeded a fault is
generated (refer to section
3.4.1
). Refer to section
5.1
for Ri threshold levels.
8.1.2
Battery undervoltage protection
The voltage threshold V
final
is 21.6 Vdc ±3% for PLN-24CH12 or 43.2 Vdc ±3% for PRS-
48CH12.
Discharging when the mains power (Vac) is not present on the battery charger
When discharging with the battery charger mains power (Vac) not present, the battery
charger will discharge the battery until V
final
. At V
final
, the undervoltage protection becomes
active: the battery charger is switched-off (latching behavior) and all outputs are shut down.
See
Figure 8.1
.
Figure 8.1
Discharge: battery voltage vs discharge time
Discharging when the mains power (Vac) is present
When discharging with the battery charger mains power (Vac) present the following applies
for the main output:
–
Below 12 A, the battery charger will supply the output voltage on the main and the
auxiliary outputs. The battery is not drained.
–
Above 12 A, the battery charger will supply 12 A to the system. The battery supplies the
rest, and is drained until V
final
. At V
final
, the undervoltage protection becomes active: the
NOTICE!
If a fault is detected, the test is performed every 30 seconds, until 20 minutes after resolving
the fault.
A
Battery charger mains is off
B
Undervoltage Protection (UVP) active: battery charger is switched-off and all
outputs are shut down.
Vfloat
Vfinal
V
t
A
B
Summary of Contents for PLN-24CH12
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