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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 143
8.3.8 Connecting back-up power
Connect the back-up power supply to the back-up
power connector on the back of the amplifier. Refer to
figure 8.13 and figure 8.14.
If a back-up power supply is used, the PRS-xPxxx
amplifiers can switch to the Power-save mode to reduce
the load on the battery. This mode is not supported by
the LBB4428/00. See section 44.4.
When an amplifier is set to Power-save mode due to a
mains failure, the audio inputs, and control inputs and
outputs are still available for use. An ambient sensing
microphone will continue to operate if connected to the
amplifier for AVC.
figure 8.13: Connecting power amplifier to ground (1)
figure 8.14: Connecting power amplifier to ground (2)
Control In
1
2 3 4 5 6 7 8 1 2
Audio In
Network
1 2
++––
Control Out Spare In Lsp Out
C NO NC 0V50V
4
3
++––
Control Out Spare In Lsp Out
C NO NC 0V50V
++––
Control Out Spare In Lsp Out
C NO NC 0V50V
2 1
++––
Control Out Spare In Lsp Out
C NO NC 0V50V
Grounded
Signal Ground
Floating
Mains
48V
48V
Battery
48V 12A
Non-isolated input
0
+
115:
100-120V 50-60Hz
230:
220-240V 50-60Hz
T6.3A 250V
T6.3A 250V
+ 0–+0 –
Class 2
Wiring
Caution
Avis
Risq of electric shock
Do not open
Risque de choc electrique.
Ne pas ouvrir
Battery
48V 12A
Non-isolated input
0
+
48V
15AT
1
1
2
2
345
48V
678 1 2 34
00
Control In Audio In
Network
48V
24
48VBattery Mains
T6.3A H
250V
100-240V
0 0
6 8
C
Control Out
Spare In Lsp Out
NO NC 0V 50V
13
C
Control Out
Spare In Lsp Out
NO NC 0V 50V C
Control Out
Spare In Lsp Out
NO NC 0V 50V C
Control Out
Spare In Lsp Out
NO NC 0V 50V
5 7
Avis
Caution
Risk of electric shock.
Do not open.
Risk of electric shock.
Do not open.
0
+
48VBattery Mains
48V
0
+
15AT
Warning
Never ground the positive terminal of the
battery, as this will damage the Praesideo
equipment. If the back-up power supply
(battery) is grounded, always connect the
negative terminal (0) first and the positive
terminal (+) second.
Disconnect in reverse order: disconnect the
positive terminal first and the negative terminal
second. This avoids excessive ground loop
currents.
Warning
For safety reasons you must use an external
circuit breaker. Install in accordance with the
local Electrical and Building Code, e.g. for USA
and Canada in accordance with NEC/CEC and
for Germany in accordance with VDE0108-1.
To reduce the risk of electric shock do not
perform any servicing other than that contained
in the operating instructions unless you are
qualified to do so. See section 1.2 Intended
audience