Control Circuitry Features; Cancel Pushbutton; Test Pushbutton; Power Requirements And Ac Voltage Selection - Federal Signal SelecTone Command Units 300VSC-1 Manuel D'installation Et D'entretien

Control Circuitry Features

The control circuitry in the 300VSC 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 turns off and the lower priority tone resumes sounding.
Pressing the CANCEL
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 tones, the TM9 "Slow Whoop" tone module is frequently installed
in the Tone 1 position as a "Fire" signal. Whenever the 300VSC is activated and is not in the Test Mode
TEST
(see " Pushbutton" below), a built-in relay opens a set of normally closed contacts and closes a set
of normally open contacts, which makes it possible to send an alarm signal to other emergency services
or circuits. Check local codes for specific requirements regarding the types of tones to use.

CANCEL Pushbutton

CANCEL
The pushbutton resets all the manually activated signaling functions of the 300VSC. It also
provides a momentary dry contact closure to facilitate remote resetting of any other alarm circuit. The
contact stays closed as long as the
not occur if the closure occurring at the remote input has not been removed.

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.

Power Requirements and AC Voltage Selection

SHOCK HAZARD — To prevent power to the 300VSC from being turned off
accidentally, it does not have a power switch and remains energized unless
power is disconnected. Before performing any installation or maintenance,
disconnect power to the 300VSC.
The 300 VSC is factory-set for 120 Vac, 50/60 Hz operation. If 240 Vac operation is required, open the
housing and slide the voltage selector switch
line fuses and the transformer on the motherboard.

Audio Inputs

A microphone can be connected directly to the 300VSC through modular jacks provided in the front
of the 300VSC. The microphone has the highest priority. There are, however, screw terminals for a
low-level, low-impedance audio signal to be input in the back of the 300VSC. The terminals enable
audio to be coupled from a PBX telephone system with the proper interface equipment supplied by the
phone company. This input is designed to also enable the direct connection of a low-impedance remote
microphone with separate PTT, which has a priority below the tones. An RCA jack in the back of the
chassis accepts a standard 1-volt audio signal from a background music source such as a radio receiver,
CD player, or a tape player.
Model 300VSC-1 and Model 300VSC-1044SB SelecTone Command Units
pushbutton deactivates any currently active tones. The local microphone has the
CANCEL
pushbutton is pressed. Resetting of remote activation will
CANCEL pushbutton after the test is completed or the false alarm is
SW1
Installation and Maintenance Manual
240V
to the position. The switch is located near the
TEST
7