rcf SB 3320 Instrucciones De Uso página 11

CALIBRATION FOR USING THE "PA FAULT" FUNCTION
The procedure described below makes it possible to calibrate the board in order to use only the PA FAULT function.
1) Disable the LINE FAULT function as described in the section DISABLING THE LINE-FAULT AND PA-FAULT FUNCTIONS.
2) Switch on the amplifier and make sure that the volume control is in a position of normal use.
3) Connect a volt-meter to the two terminals of the JP3 jumper (ref. 16 - Fig. 1, page 32).
4) Turn the RV1 trimmer (ref. 9 - Fig. 1, page 32) all the way anti-clockwise: the volt-meter should show a voltage of 5 V.
5) Slowly turn trimmer RV1 clockwise until the volt-meter indicates a stable voltage of 0 V; in this status the board is correctly
calibrated.
CONNECTIONS
CAUTION
• Before using the equipment, re-check all the connections to ensure in particular that there are no accidental short circuits.
IMPORTANT NOTES
• To prevent inductive phenomena from giving rise to hum or disturbance which could jeopardize efficient system operation,
the connection cables that transmit microphone signals should not be run in the vicinity of:
1) equipment that produces strong electromagnetic fields (e.g. large power transformers).
2) electrical energy conductors.
3) lines that supply speakers.
CONNECTION WITH THE RB 3300 BOARD
CAUTION
• To avoid causing serious damage, never connect or disconnect the SB 3320 to/from the RB 3300 board when the
latter is supplied with power; first remove the power supply voltages to the RB 3300 board, then connect/disconnect the
SB 3320 board, and subsequently re-supply power to the back-amplifier board.
Using the flat 20-wire cable provided with the SB 3320 board, connect the CN1 connector (Fig. 2, page 32) of this board to the
CN1 connector (Fig. 2, page 32) of the RB 3300 back-amplifier board.
CONNECTING THE TERMINAL STRIPS
The board incorporates a number of terminal strips, the connections of which are described in the following sections. Certain
connections will vary depending on whether or not the FIRE-BREAK and LINE FAULT functions are used.
The table below shows the terminal strips to be connected according to the functions used.
FUNCTIONS
TO BE USED
LINE FAULT
PA FAULT
FIRE-BREAK
LINE FAULT
PA FAULT
PA FAULT
FIRE-BREAK
PA FAULT
NOTE
• To facilitate connections, the terminal strips can be removed and separated from the electronic board
TERMINAL STRIPS
TO CONNECT
M1, M2, M3, M4, M5
M4, M5
M1, M3
–
NOTES
Do not use terminal strip M4 of the RB 3300 back-amplifier board.
If terminal strip M3 is not connected, the FIRE-BREAK function will be
enabled, with consequent interruption of the audio signal of the
system!
Disable transmission of the FIRE-BREAK function as described in the
section FIRE-BREAK ALARM TRANSMISSION.
Drive the amplifier input by means of terminal strip M4 of the RB 3300
back-amplifier board, as described in the respective operation manual.
Disable the LINE FAULT function as described in the section DISA-
BLING THE LINE-FAULT AND PA-FAULT FUNCTIONS.
If terminal strip M3 is not connected, the FIRE-BREAK function will be
enabled, with consequent interruption of the audio signal of the
system!
Disable the LINE FAULT function as described in the section DISA-
BLING THE LINE-FAULT AND PA-FAULT FUNCTIONS.
Disable transmission of the FIRE-BREAK function as described in the
section FIRE-BREAK ALARM TRANSMISSION.
Connect the SB 3320 board only to the RB 3300 board using the CN1
connector (ref. 8 -. Fig. 1, page 32).
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