Connecting the ground, Fail safe | Bosch Appliances 3.5 specification

Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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9.3.6 Connecting control outputs

The multi channel interface has 16 control outputs. The control outputs can be used to send signals to third party equipment to trigger actions. Each control output connection has three pins (see figure 9.8).

Control Out
C NC NO C NC NO		C NC NO C NC NO		C NC NO C NC NO		C NC NO C NC NO
1	2	3	4	5	6	7	8

figure 9.8: Control outputs

9.4Installation

The multi channel interface is suitable only for 19-inch rack installation.

The common (C) pin of the control output should always be connected. Whether the other pin that is connected is the normally closed (NC) or normally open (NO) depends on the required action (see table 9.2).

table 9.2: Control outputs details

Connection	Abbr.	Description
Normally	NC	By default, the NC
closed		contact is connected
		with common contact
		C. When the output is
		activated, the NC
		contact is opened.
Normally	NO	By default, the NO
open		contact is not
		connected with
		common contact C.
		When the output is
		activated, the NO
		contact is closed.

In the configuration, a function must be assigned to the control output that indicates when it becomes active (see table 43.6).

figure 9.9: Installation

Caution

When mounting the brackets to the unit, use the screws that are supplied with the brackets. Screws with a length of >10 mm may touch or damage internal parts of the unit.

9.5Configuration and operation

9.5.1 Overview

The multi channel interface has these functions:

•Changes the Bypass mode to Normal mode after the multi channel interface starts. Refer to 9.5.2.

•Monitors the status of each basic amplifier. Refer to 9.5.3.

•Monitors the power supply to the basic amplifiers.

•Monitors the line and loudspeaker supervision devices.

•Makes the decision to make a spare amplifier available if an amplifier channel fails. Refer to 9.5.3

•Changes the basic amplifier to Power saving mode if necessary. See chapter 44.

9.3.7 Connecting the ground

Connect the ground connection of the unit (see figure 9.2) to the 19- inch rack, which is connected to the safety ground. For good resistance to electrostatic discharges (ESD), it is important that the ground connections of the multi channel interface and the connected basic amplifiers are interconnected with short wires, directly or via the rack.

9.5.2 Fail safe

In default or unpowered state, the Bypass In is switched to the basic amplifier channels. After power on and when the network is present, the multi channel interface goes to normal operation.

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3.5 specifications

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Bosch Appliances 3.5 manual Connecting the ground, Fail safe

Models: 3.5