Chassis Description; Front Panel Features; Control Circuitry; Test Pushbutton - Federal Signal SelecTone 300SCW-1 Manuel D'installation Et D'entretien

Chassis Description

The Model 300SCW-1 is assembled in a red, powder-coated steel cabinet approximately that is 11.25 in
(28.57 cm) high by 16.23 in (41.22 cm) wide by 4.06 in (10.31 cm) deep with a hinged front cover.
The cover contains a window through which the pushbutton switches can be seen. The cover is secured
to the housing through a hinge and key-operated lock. Space is provided along the right side of the
enclosure for storage of the optional MNC-1 microphone.
Along the left side of the enclosure are two field wiring compartments that are baffled off from the
printed circuit board area. Access to these compartments is gained by removing the fastening screw from
the control panel, allowing it to open on a hinge. One compartment is for the connection of the Class II
power and signal lines, and the other is for the connection of the Class I power lines. These areas are
provided with knockouts to allow the external wiring to enter the unit through appropriate installer-
supplied bushings.

Front Panel Features

The printed circuit board (PCB) for the switches is attached to the control panel with four screws. A
wiring assembly connects the switchboard to the main PCB. The main PCB is attached to a subplate
with eight screws. The control panel switches are designated as
CANCEL
and . The tone corresponding to each switch can be labeled in the white area next to the switch
with a permanent felt-tip marker. If you are changing a tone or message, remove the marking by lightly
rubbing it with a rag dampened with denatured alcohol. To avoid damaging the switches, ensure that the
alcohol does not come in contact with them.

Control Circuitry

The control circuitry in the 300SCW-1 has a built-in priority-level feature. If a given tone is already
sounding when a higher priority tone is locally or remotely activated, the higher priority tone
automatically overrides the lower priority tone. However, the pushbutton LED for the lower priority
tone remains lit to indicate that the lower priority tone remains activated. When the higher priority tone
is deactivated, the LED in the pushbutton lights, and the lower priority tone resumes sounding. Pressing
CANCEL
the pushbutton deactivates any currently active tones. The local microphone has the highest
priority. All of the tones have priority by number sequence and all have priority over remote PA and
background music.
Because Tone 1 has priority over all other tones, the TM9 "Slow Whoop" tone module is frequently
installed in the Tone 1 position as a "Fire" signal. Whenever the 300SCW-1 is activated, and is not in
the test mode, a built-in relay causes a set of normally closed contacts to open and a set of normally
open contacts to close, which makes it possible to send an alarm signal to other emergency services or
circuits. Check with local codes for specific requirements regarding the types of tones to use.

TEST Pushbutton

TEST
The pushbutton enables the testing of tones without activating speakers on the unbalanced signal
lines. During the test the tone is heard only from the monitor speaker inside the enclosure. The
pushbutton also cancels false alarms. Whenever the pushbutton is pressed, the LED remains illuminated
to remind the operator to press the
corrected.
CANCEL
pushbutton after the test is completed or the false alarm is
Model 300SCW-1 Wall-Mounted Command Unit
Installation and Maintenance Manual
TONE 1 TONE 4
through
AUX TEST
, , ,
TEST
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