EST3 Installation and Service Manual

System overview

Network Data Riser

Network Audio Riser

Equipment Enclosure

Central

Processor

Module

Local Rail Bus

Backup

Amplifier

Zoned

Amplifier

Zoned

Amplifier

Zoned

Amplifier

Zoned

Amplifier

Page Page EVAC Alert

Figure 1-4: Normal amplifier operation

Possible fault condition Amplifier operation

Amplifier loses communication with Central Processor module

If the panel is configured for stand-alone operation, the amplifier automatically switches to the EVAC channel and outputs its 1 kHz temporal tone when the panel detects an alarm.

If the panel is not configured for stand-alone operation, the amplifier will not output any signal.

Panel loses communication with network data riser

Panel loses communication with network audio riser

Amplifier switches to the EVAC channel only in response to the local panel’s programming uses the default EVAC message.

Amplifier switches to the EVAC channel in response to the system programming. For EVAC the amplifier uses its 1 kHz temporal tone. For Alert the amplifier uses its 1 kHz 20 bps tone.

Backup amplifiers

In the event of an amplifier failure (not a field wiring problem), the backup amplifier automatically replaces the failed amplifier, as shown in Figure 1-5.

1.8 EST3 Installation and Service Manual