Technical data

Series SPB Audio Boosters Manual, Revision A
5-1
5 Operation
5.1 Introduction
This chapter describes the operating characteristics of the Series SPB Audio Booster Panel.
Included is information about the following panel features:
Supervision
Audio Notification Appliance Output Circuit Supervision
Amplifier Supervision
Actions that Initiate Alarms
5.2 Supervision
A TROUBLE LED indicates that the supervisory functions have detected a malfunction in the
panel. When a trouble condition is detected, the panel may not be able to receive and/or broadcast
messages from the host voice evacuation panel.
If a trouble condition is detected by any of the supervisory functions, the internal sounder of the
SP40S voice evacuation panel operates, the audio booster Form “C” TROUBLE relay (normally
energized) changes state, and the yellow TROUBLE LED turns “ON.” The Trouble Status Relay
may be used to provide an external audible or visual alert to indicate that the audio booster is in a
trouble condition. At the same time, one of the yellow trouble location LEDs identifies the
location of the trouble condition. If a trouble condition is indicated, follow the procedures in
Chapter 8 "Troubleshooting.”
WARNING: Do not leave the panel in a trouble condition, as it
may not play warning messages from the voice evacuation panel,
which could result in serious injury or death to you and/or others. If
the panel indicates a trouble condition: (1) provide UL required
alternative signaling and (2) have qualified service persons
immediately replace unit(s) that have malfunctioned.
WARNING: Messages requested before and during a trouble
condition may not be heard, which could result in serious injury or
death to you and/or others. If messages requested before and during
a trouble condition are still necessary, they should be repeated when
the panel is returned to normal.