Bosch Appliances 3.5 manual 8.3Connections, Introduction, Connecting the mains, Ground connection

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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8.3Connections

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:

1Put the correct type of fuse in the power amplifier (see table 8.1 and table 8.2).

table 8.1: Voltage selector and fuse (PRS-xPxxx)

Selector	Mains voltage	Fuse
	V(AC)
115	100 - 120	T6.3A H 250V
		(IEC 60127 or UL 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)

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.

3 2 1

figure 8.3: Ground connector

2 Connect the mains cord to the power amplifier.

3Connect the mains cord to a locally approved mains outlet.

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.

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.

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.

Bosch Security Systems 2011-02