Bosch Security Systems | 2006-11 | 9922 141 50781
Plena 24 VDC Battery Charger | Installation and User Instructions | Operation en | 18
4.3.3 Charge voltage and current
When the unit is connected to the battery (battery
array), the charge current and charge voltage are as
shown in figure 4.3 and figure 4.4 respectively.
When the mains voltage is removed, the output voltage
on the main 24V output (marked LOAD) is as shown in
figure 4.5.
When switching from the mains to the backup power:
• the main system output will decrease in voltage from
the charge voltage to the battery voltage (the system
will not be affected by this).
• the auxiliary outputs can have a small dip in voltage,
depending on the load (if the load is very high, the
system may report this as a fault on the remote
controls).
A battery voltage below 20 V will automatically
disconnect the load from the battery (this is for deep
discharge protection). When the mains voltage is
restored, the unit will reset and deliver output voltage
again.
When the charger has disconnected the load from the
battery, the outputs and system are without power. The
following procedure should then be followed.
Before the mains is restored:
1 Switch off the charger.
2 Switch off all amplifiers.
3 Switch off other equipment (if high inrush current is
expected).
4 Restore the mains supply.
5 Switch on the amplifiers.
6 If applicable, switch on other equipment.
7 Switch on the charger.
If this procedure is not followed (for example, if the
power is restored automatically), the charger might
activate the current limiter during power up. This can
be caused by the inrush current required to charge the
internal capacitors of the equipment, such as the
amplifiers. If this happens, turn the charger off and then
back on again.
figure 4.3: Charge current
figure 4.4: Charge voltage
figure 4.5: Output voltage (mains voltage removed)
Bulk
I
bat
Full Float
t
Voltage
controlled
Current
controlled
Bulk
U
bat
Full Float
t
V
t
Mains is shut off
24-26V battery voltage
20V shut-off
16V battery fault
Note
Equipment that has low power consumption
such as the Plena Message Manager can be left
in the On position.
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