rcf RB 3300 Manual De Uso página 27

The speaker line is connected using the "M10" terminal strip, which is used for the output of the audio signal. If the "M10" terminal strip be-
longs to a "NORMAL" unit, it must be connected to the zone speakers. If the "M10" terminal strip belongs to a "BACKUP" unit, it must be
connected with the "M9" terminal strip of the following A.C.U. ("NORMAL" or "BACKUP" unit).
Connect the "M10" terminal strip (ref. 2 – Fig. 1, page 72) as shown in Figure 6 on page 73.
TERMINAL STRIP
CONNECTING THE "MONITOR BUS" LINE
NOTES
• In the descriptions in this section, the "preceding" A.C.U. (back-amplifier board) means the one which, in the series of A.C.U.s connected
to the "monitor bus" line, is connected upstream from the current one with respect to the CP 3100 control unit.
• In the descriptions in this section, the "following" A.C.U. (back-amplifier board) means the one which, in the series of A.C.U.s connected to
the "monitor bus" line, is connected downstream from the current one with respect to the CP 3100 control unit.
The "monitor bus" line (see the section "BOARD OPERATION") is interconnected with all the A.C.U.s present in the system, which must be
able to be monitored by means of the CP 3100 control unit. Connection of the "monitor bus" line is made using terminal strips "M12" and
"M13".
The "M12" terminal strip is used for the input of the "monitor bus" line, and must be connected with the "M13" terminal strip of the following
A.C.U. (where present). If the "M12" terminal strip belongs to the last A.C.U. of the "monitor bus" line (the furthest from the CP 3100 control
unit), it is advisable to short circuit terminals "1" and "2" of the terminal strip using the 1 kohm resistor provided with the CP 3100 control unit,
in order to avoid problems of humming when there is no A.C.U. being monitored.
The "M13" terminal strip is used for the output of the "monitor bus" line, and must be connected with the "M12" terminal strip of the prece-
ding A.C.U.. If the "M13" terminal strip belongs to the first A.C.U. connected to the "monitor bus" line, it must be connected to the "moni-
tor" input of the CP 3100 control unit.
Using a screened cable, connect the "M12" terminal strip (ref. 5 – Fig. 1, page 72) and "M13" terminal strip (ref. 19 – Fig. 1, page 72) as shown
in Figure 7 on page 74. Figure 8 on page 74 shows the connection of the "monitor bus" line in a hypothetical system of 5 or more ("n") groups.
CONNECTING THE "BACKUP PA BUS" LINE
NOTES
• In the descriptions in this section, the "preceding" A.C.U. (back-amplifier board) means the one which, in the group of A.C.U.s, is connec-
ted upstream from the current one with respect to the last backup amplifier.
• In the descriptions in this section, the "following" A.C.U. (back-amplifier board) means the one which, in the group of A.C.U.s, is connected
downstream from the current one with respect to the last backup amplifier.
The "backup PA bus" line (see the section "BOARD OPERATION") is connected using the "M8" and "M9" terminal strips.
The "M8" terminal strip is used for the output of the "backup PA bus" line. If the "M8" terminal strip belongs to a "NORMAL" unit, it must be
connected with the "M9" terminal strip of the following "NORMAL" unit (where present and belonging to the same group). If the "M8" termi-
nal strip belongs to the last "NORMAL" unit of the "backup PA bus" line (the furthest from the backup amplifier), it must not be connected.
If the "M8" terminal strip belongs to the "BACKUP" unit, it must not be connected.
The "M9" terminal strip is used for the input of the "backup PA bus" line (see the section "BOARD OPERATION"). If the "M9" terminal strip
belongs to an A.C.U. which is preceded by a "NORMAL" unit, it must be connected with the "M8" terminal strip of the preceding unit. If the
"M9" terminal strip belongs to the first "NORMAL" unit of the group (the nearest to the backup amplifier), it must be connected:
• with the "M10" terminal strip of the first "BACKUP" unit ("BACKUP" unit number 1).
• with the speaker output of the backup amplifier, when there is only one backup amplifier in the group and it is not controlled by an RB 3300
back-amplifier board.
If the "M9" terminal strip belongs to the "BACKUP" unit, it must be connected:
• with the "M10" terminal strip of the next "BACKUP" unit ("BACKUP" unit number 2, 3, etc.), when an additional backup amplifier is pre-
sent and controlled by an RB 3300 back-amplifier board.
• with the speaker output of the next backup amplifier of the group (backup amplifier number 2, 3, etc.), when this amplifier is present and is
not controlled by an RB 3300 back-amplifier board.
If the "M9" terminal strip belongs to the only or the last "BACKUP" unit of the group, it must not be connected.
Using a cable of suitable cross-section, connect the "M8" terminal strip (ref. 15 – Fig. 1, page 72) and "M9" terminal strip (ref. 1 – Fig. 1, pa-
ge 72) as shown in Figure 9 on page 75.
TERMINAL STRIP
TERMINAL FUNCTION
M10 N° 1: + high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
N° 2: - high level audio signal (e.g. 25 V – 50 V – 70 V – 100 V)
TERMINAL STRIP TERMINAL FUNCTION
M12 N° 1: "hot" balanced audio signal (low level)
N° 2: "cold" balanced audio signal (low level)
M13 N° 1: audio signal GND
N° 2: "hot" balanced audio signal (low level)
N° 3: "cold" balanced audio signal (low level)
TERMINAL FUNCTION
M8 N° 1: + audio signal for speakers (e.g. 25 V – 50 V – 70 V – 100 V)
N° 2: - audio signal for speakers (e.g. 25 V – 50 V – 70 V – 100 V)
M9 N° 1: + audio signal for speakers (e.g. 25 V – 50 V – 70 V – 100 V)
N° 2: - audio signal for speakers (e.g. 25 V – 50 V – 70 V – 100 V)
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