rcf SB 3320 Instrucciones De Uso página 9

5) "M4" terminal strip
Used for the input of the audio signal for speakers (e.g. 25 V, 50 V, 70 V, 100 V signal).
6) "DL4 - GND" indicator light
This LED lights up to indicate an alarm caused by a short circuit between the speaker line and the earth circuit. The alarm
is transmitted to the CP 3100 control unit (LINE FAULT alarm).
7) "DL5 - FIRE" indicator light
This LED lights up to indicate an alarm caused by activation of the FIRE-BREAK function by means of terminal strip M3.
The alarm is transmitted to the CP 3100 control unit (FIRE BREAK alarm). In order for this LED to operate, the JP1
jumper must be in the 1-2 position.
NOTE
• When the transmission of the FIRE-BREAK alarm is disactivated (JP5 jumper in position "2-3"), the DL5 LED continues
to stay on.
8) "CN1" connector
Used for connection with the RB 3300 back-amplifier board.
9) "RV1" connector
Used for calibrating the board, i.e. to regulate the test tone level for fault detection.
10) "JP1" jumper
Used for activating/disactivating transmission of the FIRE-BREAK alarm to the CP 3100 control unit.
11) "JP2" jumper
Enables an increase of 6 dB in the gain of the fault detector circuit of the board.
NOTE
• The increase in gain of the fault detector circuit must be chosen by a specialized technician.
12) "M3" terminal strip
Used for controlling the FIRE-BREAK function, which makes it possible to transmit an emergency signal with absolute
priority, excluding the signal coming from the audio matrix of the system.
13) "M1" terminal strip
This terminal strip is used when the FIRE-BREAK function is used, and enables the input of the emergency signal com-
ing from an audio source not connected to the system matrix.
14) "M2" terminal strip
Used for the output of the balanced low level audio signal. With the FIRE-BREAK function disabled, the signal available
on the output comes from the RB 3300 board. With the FIRE-BREAK function enabled, the signal available on the output
comes from the source connected to terminal strip M1.
15) "JP4" jumper
Used for disabling the LINE FAULT function (see the section "DISABLING THE LINE-FAULT AND PA-FAULT FUNC-
TIONS").
16) "JP3" jumper
Used for disabling the PA FAULT function (see the section "DISABLING THE LINE-FAULT AND PA-FAULT FUNC-
TIONS").
17) RV2 control
Used for calibrating the board ; i.e. makes it possible to regulate the tripping threshold of the LINE FAULT.
INSTALLATION
The SB 3320 board is installed on the rack support of the RB 3300 back-amplifier board. Using the four M3 screws provided
with the SB 3320 board, attach the board to the four spacers A of the rack support of the RB 3300 board, as shown in Figure 2
on page 32.
SETTING
CAUTION
• The settings described in this section must only be made by qualified, well-trained personnel. The information below
DOES NOT CONCERN THE USER, who need not read it.
• To ensure correct operation of the board, do not make any settings or adjustments which are not described in this section.
"FIRE-BREAK" ALARM TRANSMISSION
The JP1 jumper on the SB 3320 board is used for enabling or disabling transmission of the FIRE-BREAK alarm to the CP
3100 control unit.
Disabling the transmission, in addition to being necessary when the FIRE-BREAK function is not used, is also useful, when the
FIRE-BREAK function is enabled with a single command on several SB 3320 boards, to prevent the boards from transmitting
the alarm to the CP 3100 control unit simultaneously. The jumper can have one of two positions, and short-circuits two of the
three terminals on the board.
POSITION OF "JP1" JUMPER
Short circuit of terminals 1 – 2
Short circuit of terminals 2 - 3
(standard position)
FUNCTION
FIRE-BREAK alarm transmission enabled.
FIRE-BREAK alarm transmission disabled.
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