Ovl" Alarm; Fire-Break" Function; Line Fault" Function; Pa Fault" Function - Mackie RCF RX 3000 Instructions D'emploi

"OVL" ALARM

The RB 3300 board is equipped with an input that can be connected to an auxiliary contact of the amplifier being controlled, which makes it pos-
sible to pick up alarm signals. The type of alarm picked up thus depends on the specific amplifier used, and can be, for example, related to the
intervention of one of the protection circuits, or to abnormal amplifier operation (e.g. operation in overload). The alarm is transmitted by means of
the closing of an auxiliary contact of the amplifier: if the alarm condition persists for at least 10 seconds, the RB 3300 activates the alarm indi-
cation on the CP 3100 control unit via the serial line. By programming the control unit in a certain way, when the amplifier goes into alarm status,
a backup amplifier will be automatically activated in its place (see the section USING THE "ACU" MENU).

"FIRE-BREAK" FUNCTION

This function can be used when the RB 3300 back-amplifier board (A.C.U.) is equipped with the optional SB 3320 FAULT DETECTOR board,
and makes it possible to drive the amplifier controlled by the RB 3300 board with an emergency signal coming from a source not connected
to the RX 3000 system, interrupting the normal transmission of the signal coming from the audio matrix. This guarantees, even in the
event of a fault on a component of the RX 3000 system (e.g. OB 3230 AUDIO OUTPUT board), that a message with absolute priority can be
transmitted (e.g. fire alarm). To ensure the maximum certainty of intervention, the "fire-break" function acts exclusively at the
hardware level.

"LINE FAULT" FUNCTION

The LINE FAULT function can be used when the RB 3300 back-amplifier board (A.C.U.) is equipped with the optional SB 3320 FAULT DE-
TECTOR board, and makes it possible to control the impedance of the speaker line driven by means of the RB 3300 board. Any malfunction
that causes a significant variation in the line impedance activates the respective alarm, which is transmitted to the CP 3100 control unit. The
malfunctions that can be detected are:
• short circuit between the two conductors of the speaker line,
• interruption of the speaker line,
• short circuit between the speaker line and the earth circuit.
IMPORTANT NOTE
• When the RB 3300 board is controlling a backup amplifier, the LINE FAULT function can only be used to detect a short circuit between the
speaker line and the earth circuit; the function does not detect a short circuit between the two conductors of the speaker line or an
interruption of the speaker line.

"PA FAULT" FUNCTION

The PA FAULT function can be used when the RB 3300 back-amplifier board (A.C.U.) is equipped with the optional SB 3320 FAULT DETEC-
TOR board. It enables a check for correct operation of the amplifier controlled by the RB 3300 board by picking up the signal on the speaker
output. Any amplifier malfunction that causes a significant decrease in the power transmitted activates the respective alarm, which is tran-
smitted to the CP 3100 control unit. By programming the CP 3100 unit in a particular way, when the amplifier goes into alarm status, a backup
amplifier is automatically activated in its place (see the section USING THE "ACU" MENU).

"ALC" FUNCTION

The ALC function (Automatic Level Control) can be used when the RB 3300 back-amplifier board (A.C.U.) is equipped with the optional
LB 3340 DIGITAL ALC board. This function permits automatic control of the signal/noise ratio in the area covered by the sound system; that
is, it makes it possible to maintain a constant margin of level between the signal diffused and the ambient noise in order to ensure perfect cla-
rity of the sound messages. This characteristic is particularly useful in premises that are subject to strong noise variations. The ALC function
is based on the use of condenser microphones (up to four), or loudspeakers with line transformer operating as microphones, used for detec-
ting the ambient noise level. The signal picked up is processed digitally to control an electronic attenuator in order to guarantee perfect regu-
lation of the signal.
IMPORTANT NOTE
• The ALC function cannot be used when the RB 3300 board is controlling a backup amplifier; therefore, a BACKUP A.C.U. cannot be
equipped with the LB 3340 DIGITAL ALC board.

SYSTEM EVENTS

The system is designed to handle the types of events described below.

EVENTS CONTROLLED FROM THE BM 3616 DIGITAL CONSOLES

The following operations can be controlled from the BM 3616 digital consoles:
• transmission of an announcement using the console microphone to specific zones and/or groups of zones.
• transmission of an audio signal (e.g. message, pre-announcement/alarm tone, etc.) recorded on the hard disk of the CP 3100 control unit
(audio files) to specific zones and/or groups of zones.
• transmission of a message recorded in the console memory to specific zones and/or groups of zones.
• switching of contacts of certain relays of the IO 3250 digital INPUT/OUTPUT boards.
• EMERGENCY event control, for the transmission of a microphone announcement from the console or an alarm signal (message or tone)
recorded on the hard disk of the CP 3100 control unit with absolute priority to specific zones and/or groups of zones. Together with the ac-
tivation of the event, it is also possible to control the switching of relays of the IO 3250 digital INPUT/OUTPUT boards.
To program the events that can be controlled from the BM 3616 digital consoles, see the section USING THE "CONSOLES" MENU.

EVENTS CONTROLLED FROM THE BM 3604 CONSOLE

The following operations can be controlled from the BM 3604 consoles:
• transmission of an announcement using the console microphone to specific zones and/or groups of zones.
• switching of contacts of certain relays of the IO 3250 digital INPUT/OUTPUT boards.
• transmission of an audio signal (e.g. message, pre-announcement/alarm tone, etc.) recorded on the hard disk of the CP 3100 control unit
(audio files) to specific zones and/or groups of zones.
• control of warning signals on the CP 3100 control unit.
77