Federal Signal Corporation AM50-70B Instrucciones De Instalación página 4

alerting signals. Either a 25 or 70 VRMS AC signal source can be used. In addition, this
loudspeaker can reproduce full range voice communication. An in-line capacitor (supplied)
provides the isolation necessary for supervisory use.
Speaker style: a high-impact plastic re-entrant housing for various applications.
The speaker is supplied with wiring terminals and strain relief for speaker in/out
wiring (see figure 1). An optional auxiliary terminal is supplied on the speaker PC board.
B. POWER ADJUSTMENT.
See figures 1 and 2. Multiple power settings are achieved via an adjustable mini jumper.
The unit is set at the factory to the 1/4-watt position. To increase the power (volume), remove
the supplied mini jumper and place it on the designated pins corresponding to the desired
power setting (see table 1). Ensure that the mini jumper is fully seated.
C. INSTALLATION.
To avoid electrical shock, do not attempt to install wires when power is on.
1.
Electrical Connections.
An uninsulated section of a single conductor must NOT be looped around a
terminal and used as two separate connections. The wire must be severed to
provide electrical supervision of the connection.
Use 2 x 14-18 AWG wiring for speaker models.
Strip 1/4" of insulation from all wiring leads. Attach the appropriate wires to the
corresponding terminals on the back of the speaker as shown in figures 1, 2, and 3. (Speaker
wires are connected to terminals "S+" and "S-".) Tighten the screws to ensure that the wires
are firmly held in place.
To select the desired wattage, refer to paragraph B. and see figure 2. Using the
mini jumper, set the desired output level (1/4, 1/2, 1, or 2-watt). See table 1.
An optional auxiliary terminal is supplied on the PC board.
2.
Mounting (see figures 4 and 5).
Placement of the Model AM50 speaker within a standard 4 x 4 electrical box
requires positioning the rear of the speaker correctly with respect to conduit
entryways (see figure 4). Four entryways into the 4 x 4 box cannot be utilized due
to the speaker's rear geometry. Be sure to note the site conduit layout prior to
speaker installation.
The Re-entrant housings fit either a NB (standard 4 x 4 electrical box) or NBL
back box. Re-entrant housings will fit an FBL back box with a FG grille. The Re-entrant
housings will also fit a WB back box a trim ring included. An auxiliary trim ring is also
supplied (see figure 1) for mounting arrangements.
Use the two #8-32 x 3" (supplied) mounting screws and mount the speaker as
shown in figure 5.
NOTE
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