Bosch Plena Voice Alarm System Service Manual download pdf (Page 36)

Bosch Security Systems | 2004-06 | 9922 141 10371en

Plena Voice Alarm System | Installation and User Instructions | Installation en | 36

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+).

figure 4.8: Volume override contacts

NO NC

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Bosch Plena Voice Alarm System Service Manual Page 36