Setting Single And Dual Channel Use; Override Contact Setting - Bosch LBB 1925 Installation And Operating Manual

Plena System Pre-amplifier | Installation and Operating Manual |

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

RL606 D613
D614
CN3
CN21
D606
J4
RL612
RL612
J3
Figure 2.4
Jumpers J3 and J4 select whether the override output for each zone (indicated by
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.
Bosch Security Systems | 2003-09 | 3922 988 99483en
RL605 RL604 RL603
D605 D604 D603
RL611 RL610 RL609
RL611 RL610 RL609
25-6
3938 101 90272
Internal settings
RL602 RL601
D602 D601
RL608 RL607
RL608 RL607
3-wire (zone 1-6)
0V
AMPLIFIER
100V
OVERRIDE
LOCAL VOLUME
CONTROL
Figure 2.5
4-wire (zone 1-6)
LOCAL VOLUME CONTROL
0V
AMPLIFIER
100V
OVERRIDE
24V
DC Out 24V (-)
Figure 2.6
) is switching between the 0V
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