Bosch Plena - Connecting Volume Overrides

Bosch Security Systems | 2004-06 | 9922 141 10371en
Plena Voice Alarm System | Installation and User Instructions | Installation en | 35
4.9 Connecting volume overrides
The controller has six 24V DC volume override
connectors, one for each loudspeaker zone (Z1 - Z6, see
figure 4.7). Volume override can be used to get a
business or emergency call through, regardless of local
volume controls. This can be useful in case local zone
volumes have been set to a low volume level. Both 4-
wire (see section 4.9.1) and 3-wire (see section 4.9.2)
override schemes are supported.
Internally, the positive override pins (Z+) are all
connected to either the NC or the NO contact of the
Volume Override output (see figure 4.8). The negative
override pins (Z-) are all connected to earth.
figure 4.6: Connecting loudspeaker zones
Z1
Z2
Z3
Z4
Z5
Z6
Ext
Booster
In
DC In
10 0V
0
Int
Booster
Out
10 0V
0
10 0V
0
10 0V
0
10 0V
0
10 0V
0
10 0V
0
24V
70V
10 0V
0
Call out
10 0V
0
10 0V
0
10 0V
0
10 0V
0
10 0V
0
10 0V
0
Z2
Z3
Z4
Z5
Z6
Z1
AB
BGM/
10 0V
LBB1990/00
Voice Alarm Controller
1A 1B
2A 2B
3A 3B
4A 4B
5A 5B
6A 6B
figure 4.7: Volume override outputs
LBB1990/00
Voice Alarm Controller
COM
NC
NO
NC
TRG2
Override/Trigger Output
TRG 1
24V
EMG
Fault
Call
Z1
Z2
Z3
Z4
Z5
Z6
NC
COM
NO
NC
COM
NO
NC
COM
NO
NO
24V
Volume Override