4-Wire Volume Override - Bosch Plena Installation And User Instruction Manual

Plena Voice Alarm System | Installation and User Instructions | Installation
4.9.1

4-wire volume override

See figure 4.9, situation I for an example of a fail-safe
4-wire volume override:
• Connect the NC contact of the Volume Override to the
24V contact of the Volume Override.
LBB1990/00
Voice Alarm Controller
figure 4.9: 4-wire volume override
Bosch Security Systems | 2004-06 | 9922 141 10371en
Override/Trigger Output
24V
NC NO
NC
Z1
COM EM
COM
NO
Z2
NC
COM Fault
Z3
NO
NC
Z4
Call
COM
NO
Z5
NC
24V Volume Override
Z6
NO
G 1
TRG2
Override/Trigger Output
24V
NC NO
NC
Z1
EM
COM
COM
NO
Z2
NC
Fault
COM
Z3
NO
NC
Z4
COM Call
NO
Z5
NC
24V Volume Override
Z6
NO
G 1
TRG2
See figure 4.9, situation II for an example of a
power-saving 4-wire volume override:
• Connect the NO contact of the Volume Override to the
24V contact of the Volume Override.
100V
0V
24V
0V
100V
0V
24V
0V
en | 37
NO
NC
NC
NO