Installation; Settings; Monitor Sensitivity Selection; Monitor Source Selection - rcf RB 3300 Manual De Uso

INSTALLATION

IMPORTANT NOTE
• The rack enclosure in which the board is installed must meet all the requirements of the EN 60439-1 standard; in particular, the rear part
must be closed by means of suitable panels.
Attach the panel that supports the RB 3300 board to the back of the 19" rack enclosure in correspondence with the amplifier to be control-
led, fitting the two "bayonet" tabs on the panel into the rectangular holes on the rack uprights. The panel occupies two rack units (1U = 1
= 44 mm).

SETTINGS

CAUTION
• The settings described in this section must only be made by qualified and experienced personnel who are capable of carrying out all the
operations correctly. The following information DOES NOT CONCERN THE USER, who need not read it.

MONITOR SENSITIVITY SELECTION

This setting is necessary in order to be able to monitor the speaker output of the amplifier controlled by the RB 3300 board (see the section
"MONITOR SOURCE SELECTION" below). Using the "JP4" jumper (ref. 17 – Fig. 1, page 72), it is necessary to select the sensitivity of the
monitor circuit according to the nominal output voltage of the amplifier (25 V, 50 V, 70 V, 100 V). The jumper can have one of four different po-
sitions, and short circuits one of four pairs of terminals on the board, as follows.
IMPORTANT NOTE
• An incorrect setting of the sensitivity will cause the level of the monitor signal to be insufficient or excessive (distorted signal).

MONITOR SOURCE SELECTION

The "JP5" and "JP6" jumpers on the RB 3300 board are used to select the type of monitor signal to transmit on the "monitor bus" line when
the CP 3100 control unit requests monitoring of the A.C.U. (see the section "MONITOR FUNCTION"). You can select the speaker output si-
gnal of the amplifier controlled by the RB 3300 board, or the signal of the microphones connected to the LB 3340 DIGITAL ALC board; the
latter selection can be necessary for technical reasons during the initial tests for the installation of the LB 3340 board. Each jumper can have
one of two different positions, and short circuits two of the three terminals on the board.
POSITION OF "JP5" AND "JP6" JUMPERS FUNCTION
Short circuit of terminals 1 – 2
Short circuit of terminals 2 - 3
IMPORTANT NOTES
• The two jumpers must always be placed in the same position ("1-2" or "2-3").
• When the two jumpers are moved to the position "2-3", monitoring of the amplifier speaker output is disabled.

BOARD ADDRESS ASSIGNMENT

A number called the "address" must be assigned to each RB 3300 back-amplifier board of the system in order to identify and handle the
boards. The address can be from 0 to 119 (for 120 RB 3300 boards). The first 7 microswitches of the "SW1" dipswitch on the board (ref. 11
– Fig. 1, page 72) are used for assigning the address. The table below shows the positions to assign to the 7 microswitches for each of the
120 addresses. We recommend that you assign addresses to the boards starting from address number zero and continuing with an increase
of one unit for each subsequent board installed.
POSITION OF "JP4" JUMPER
Position "A"
Position "B"
Position "C"
Position "D"
(standard position)
FUNCTION
Sensitivity for 100 V amplifier output.
Sensitivity for 70 V amplifier output.
Sensitivity for 50 V amplifier output.
Sensitivity for 25 V amplifier output.
Selection of the signal coming from the amplifier speaker
output (25 V, 50 V, 70 V, 100 V).
Selection of the signal coming from the microphones con-
nected to the LB 3340 DIGITAL ALC board.
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⁄ "
3
4