Bosch Plena Installation And User Instruction Manual page 36

Plena Voice Alarm System | Installation and User Instructions | Installation
+
Z1
_
+
Z2
_
+
Z3
_
+
Z4
_
+
Z5
_
+
Z6
_
figure 4.8: Volume override contacts
Normally, when there are no active calls, the Z+ pins
are internally connected to the NC contact of the Volume
Override. At the moment a call is started in a zone, the
Z+ pin of the zone is internally connected to the NO
contact of the Volume Override. So, the NC and the NO
contacts determine which voltage is supplied to the
positive pins of the override outputs (Z+).
Bosch Security Systems | 2004-06 | 9922 141 10371en
NO NC
en | 36