Bosch LBB 1925 Instructions d'exploitation télécharger pdf (Page 11)

Bosch Security Systems | 2003-09 | 3922 988 99483en

Plena System Pre-amplifier | Installation and Operating Manual | en | 11

2.5 Setting single and dual channel use

The system pre-amplifier can be used with one booster amplifier for both music and calls ('1 channel use'). Any call

will interrupt background music in all zones. It is also possible to use separate booster amplifiers, for music and calls

('2 channel use'). Now a call will not interrupt music in zones, not addressed by the call. Jumper JP102 selects

whether background music is going to the Master output (1 channel use) or not (2 channel use). Jumper J2 must be

set to either 1 channel use or 2 channel use to select the amplifier terminals for the zones.

2.6 Override contact setting

Jumpers J3 and J4 select whether the override output for each zone (indicated by ) is switching between the 0V

and 100V loudspeaker signal, or between ground and 24Vdc. This override output is available per zone and may be

used to override local volume controls, to make sure that calls are coming through. For 3-wire volume override, the

jumpers should be in 100V audio position. For 4-wire override the jumpers should be in 24Vdc position. The

drawings show the principle of 3- and 4-wire volume override. The override outputs are activated whenever a call is

made, when the emergency input is activated, or an alarm or time signal is triggered. At the same time also the Call

Active relay is activated, providing a potential free contact.

D614

RL606 D613

RL605 RL604 RL603 RL602 RL601

RL611RL612

CN21

Override

24V dc

10 0 V

audio

CN24

RL610

RL611RL612 RL610 RL609

25-6

3938 101 90272

RL608 RL607

CN22 CN20

RL609

D605D606 D604 D603

RL608

D602

RL607

D601

CN3

LOCA L VOLUM E

CONTROL

OVERRIDE

AMPLIFIER

3-wire (zone 1-6)

100V

LO CAL VOLUME CONTROL

OVERRIDE

AMPLIFIER

4-wire (zone 1-6)

100V

24V

DC Out 24V (-)

Figure 2.5

Figure 2.4 Figure 2.6

Internal settings

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 29 30

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Bosch LBB 1925 Instructions d'exploitation Page 11

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