Filter
Top Products
Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 136
8.3 Connections
8.3.1 Introduction
This section gives an overview of typical system
connections using the power amplifier.
• Connecting the mains (see section 8.3.2).
• Connecting the network (see section 8.3.3).
• Connecting to ground (see section 8.3.4).
• Connecting the amplifier channels (see
section 8.3.5).
• Connecting audio inputs (see section 8.3.6).
• Connecting control inputs (see section 8.3.7).
Connecting back-up power supply (see section 8.3.8)
8.3.2 Connecting the mains
Proceed as follows to connect the power amplifier to the
mains:
1 Put the correct type of fuse in the power amplifier
(see table 8.1 and table 8.2).
2 Connect the mains cord to the power amplifier.
3 Connect the mains cord to a locally approved mains
outlet.
8.3.3 Connecting the network
Connect the power amplifier to the Praesideo system
using the system bus connectors and LBB4416 network
cables. Both connectors are interchangeable.
8.3.4 Ground connection
LBB4428/00 only: A ground jumper can connect the
signal ground to the safety ground. This jumper is X3 on
the printed circuit board. Set the jumper to connect pins
2 and 3 to connect signal ground to the safety ground.
Set the jumper to connect pins 1 and 2 to isolate the
signal ground.
The manufacturers setting is as a floating ground with
the jumper connecting pins 1 and 2. If the audio line or
microphone input of the amplifier is used and the
connected audio source is not grounded, the jumper can
be connected between pins 2 and 3 to reduce the
susceptibility to external RF disturbances. If the audio
source already has the signal ground connected to a
safety ground, leave the jumper connected to pins 1 and
2 to avoid ground loops that can be a source of hum.
figure 8.3: Ground connector
For the PRS-1P500, PRS-2P250 and PRS-4P125: With
the rear switch (13 in fig 8.2) the signal ground can be
connected to safety ground.
table 8.1: Voltage selector and fuse (PRS-xPxxx)
Selector Mains voltage
V(AC)
Fuse
115 100 - 120 T6.3A H 250V
(I EC 60127 or U L 248)
230 220 - 240 T6.3A H 250V
(IEC 60127)
table 8.2: Voltage range and fuse (LBB4428/00)
Voltage range Fuse
100 - 240 V(AC) T6.3A H 250V
(IEC 60127 or UL 248)
Warning
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.
123