Model PA300 Electronic Siren

Model PA300 Electronic Siren
Price $4.00
Model PA300*
ELECTRONIC SIREN
INSTALLATION, SERVICE, AND OPERATING INSTRUCTIONS
LIMITED WARRANTY
The Signal Division, Federal Signal Corporation (Federal), warrants each
new product to be free from defects in material and workmanship, under
normal use and service, for a period of two years on parts replacement and
one year on labor from the date of delivery to the first user-purchaser.
During this warranty period, the obligation of Federal is limited to repairing
or replacing, as Federal may elect, any part or parts of such product which
after examination by Federal discloses to be defective in material and/or
workmanship.
Federal will provide warranty for any unit which is delivered, transported
prepaid, to the Federal factory or designated authorized warranty service
center for examination and such examination reveals a defect in material
and/or workmanship.
This warranty does not cover travel expenses, the cost of specialized
equipment for gaining access to the product, or labor charges for removal
and re-installation of the product. Lamps, flash tubes, or batteries are not
covered under warranty.
This warranty does not extend to any unit which has been subjected to abuse,
misuse, improper installation or which has been inadequately maintained,
nor to units which have problems relating to service or modification at any
facility other than the Federal factory or authorized warranty service
centers.
THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. IN NO EVENT SHALL FEDERAL BE LIABLE FOR ANY
LOSS OF PROFITS OR ANY INDIRECT OR CONSEQUENTIAL
DAMAGES ARISING OUT OF ANY SUCH DEFECT IN MATERIAL OR
WORKMANSHIP.
SECTION I
GENERAL DESCRIPTION
reproduction without feedback “squeal”. The microphone push-to-talk switch overrides any siren signal
for instant PA use. PA and radio volume are adjustable by means of a front panel GAIN control. Radio
inter-connect wires are built-in. No additional cables
are required.
The Model PA300's 100-watt output is designed
to drive a single high power speaker.
The Tap II feature allows the driver to change
the siren sound from wail to yelp (or vice-versa) via
the vehicle's horn ring. Tap II provides especially
effective traffic clearing capability. In addition to Tap
II, additional alternate sounds can be activated in
two other selector switch positions by depressing and
holding the horn ring for as long as the alternate
sound is desired. The charts in Section IV of this
manual illustrate the operation of these features
more fully.
Figure 1-1. Model PA300* Electronic Siren.
The Federal Model PA300 (figure 1-1) is a
precision built, efficient and economical, full-featured electronic siren of advanced design. It provides
wail, yelp and hi-lo siren tones, as well as the Tap II
feature, public address (PA), radio rebroadcast and
an air horn sound.
Other special features of the Model PA300
include:
• High degree of reliability is achieved
through the use of integrated circuits
and silicon output transistors.
The siren may be installed in positive or negative ground vehicles with 12-volt electrical systems.
It is protected against failure modes (including reversed polarity) by a fuse that is replaceable without
tools. No components protrude from the bottom of the
siren to interfere with mounting arrangements.
• Control panel is illuminated with
non-glare lighting.
• Newly designed printed circuit board
provides improved performance and
durability under a wide range of
environmental conditions.
A noise-cancelling microphone is wired-in to
prevent loss or theft. It provides high quality voice
-1-
SECTION II
SPECIFICATIONS
Input Voltage .
.
.
.
.
.
.
.
.
.
.
.
. 11VDC to 16VDC (16V operation limited to 15 minutes).
Polarity .
.
.
.
.
.
.
.
.
.
.
.
. Negative or positive ground.
Standby Current .
.
.
.
.
.
.
.
.
.
.
. 120ma. max. (not incl. panel light).
Operating Temperature Range
.
.
.
.
.
.
. -30°C (-22°F) to +60°C (+149°F).
Operating Current (14VDC-Wail mode)
.
.
.
. 10 amperes, max.
Frequency Range .
.
.
.
.
.
.
.
.
.
.
. 725 to 1575Hz.
Cycle Rate .
.
.
.
.
.
.
.
.
.
.
. Wail- 12 cycles/min.
Yelp- 180 cycles/min.
Hi-Lo- 60 cycles/min.
Voltage Output (approx.)
.
.
.
.
.
.
.
.
. 64V peak-to-peak.
Dimensions (HWD) .
.
.
.
.
.
.
.
.
. 2-1/2" (6.35cm) x 6-1/2" (16.51cm) x 8-1/2" (21.59cm).
Net Weight (incl. microphone).
.
.
.
.
.
.
. 4-1/2 lbs. (2.04kg).
Shipping Weight .
.
.
.
.
.
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. 6-1/2 lbs. (2.94kg).
.
.
.
.
.
.
.
.
.
NOTE
The following parameters were obtained with the
radio input potentiometer and GAIN control set
at maximum.
Audio Frequency Range .
.
.
.
.
. 300 to 10,000Hz.
Harmonic Audio Distortion (300-3,000Hz).
.
.
. 10% max. all power levels from 1/2 to 50 watts (frequency
response ±3dB).
Input Impedance (Radio)
.
.
. 2000 ohms.
Input voltage required to obtain 20VRMS across
speaker load (Radio) . . . . . . . . .
. 0.55VRMS.
.
.
.
.
.
.
.
.
.
.
-2-
SECTION III
INSTALLATION
SAFETY MESSAGE TO INSTALLERS
OF
ELECTRONIC SIRENS
WARNING
The lives of people depend on your proper installation and
servicing of Federal products. It is important to read and
follow all instructions shipped with the products. In addition,
listed below are some other important safety instructions and
precautions you should follow:
•
Sound output will be severely reduced if any objects are
in front of the speaker. If maximum sound output is
required for your application, you should ensure that the
front of the speaker is clear of any obstructions.
•
Install the speaker(s) as far forward on the vehicle as
possible, in a location which provides maximum
signaling effectiveness and minimizes the sound
reaching the vehicle’s occupants. Refer to the National
Institute of Justice guide 500-00 for further information.
•
Mounting the speakers behind the grille will reduce the
sound output and warning effectiveness of the siren
system. Before mounting speakers behind the grille,
make sure the vehicle operators are trained and
understand that this type of installation is less effective
for warning others.
•
Sound propagation and warning effectiveness will be
severely reduced if the speaker is not facing forward.
Carefully follow the installation instructions and always
install the speaker with the projector facing forward.
•
DO NOT install the speaker(s ) or route the speaker
wires where they may interfere with the operation of air
bag sensors.
•
Installation of two speakers requires wiring speakers in
phase.
•
Never attempt to install aftermarket equipment, which
connects to the vehicle wiring, without reviewing a
vehicle wiring diagram - available from the vehicle
manufacturer. Insure that your installation will not
affect vehicle operation and safety functions or circuits.
Always check vehicle for proper operation after
installation.
•
DO NOT install equipment or route wiring or cord in the
deployment path of an air bag.
•
Locate the control head so the vehicle, controls, and
microphone can be operated safely.
•
When drilling into a vehicle structure, be sure that both
sides of the surface are clear of anything that could be
damaged.
Before Installation
Qualifications
•
To properly install an electronic siren: you must have a
good understanding of automotive electrical procedures
and systems, along with proficiency in the installation
and service of safety warning equipment. Always refer to
the vehicle's service manuals when performing
equipment installations on a vehicle.
Sound Hazards
•
Your hearing and the hearing of others, in or close to
your emergency vehicle, could be damaged by loud
sounds. This can occur from short exposures to very loud
sounds, or from longer exposures to moderately loud
sounds. For hearing conservation guidance, refer to
federal, state, or local recommendations. OSHA
Standard 1910.95 offers guidance on “Permissible Noise
Exposure.”
•
All effective sirens and horns produce loud sounds (120
dB) that may cause permanent hearing loss. Always
minimize your exposure to siren sound and wear hearing
protection. Do not sound the siren indoors or in enclosed
areas where you and others will be exposed to the sound.
•
Federal Signal siren amplifiers and speakers are
designed to work together as a system. Combining a
siren and speaker from different manufacturers may
reduce the warning effectiveness of the siren system and
may damage the components. You should verify or test
your combination to make sure the system works
together properly and meets federal, state and local
standards or guidelines.
During Installation
•
•
•
•
DO NOT get metal shavings inside the product. Metal
shavings in the product can cause the system to fail. If
drilling must be done near the unit, place an ESD
approved cover over the unit to prevent metal shavings
from entering the unit. Inspect the unit after mounting
to be sure there are no shavings present in or near the
unit.
After Installation
DO NOT connect this system to the vehicle battery until
ALL other electrical connections are made, mounting of
all components is complete, and you have verified that
no shorts exist. If wiring is shorted to vehicle frame,
high current conductors can cause hazardous sparks
resulting in electrical fires or flying molten metal.
Be sure the siren amplifier and speaker(s) in your
installation have compatible wattage ratings.
In order for the electronic siren to function properly, the
ground connection must be made to the NEGATIVE
battery terminal.
•
After installation, test the siren system and light system
to ensure that it is operating properly.
•
Test all vehicle functions, including horn operation,
vehicle safety functions and vehicle light systems, to
ensure proper operation. Ensure that installation has
not affected vehicle operation or changed any vehicle
safety function or circuit.
•
After testing is complete, provide a copy of these
instructions to the instructional staff and all operating
personnel.
•
File these instructions in a safe place and refer to them
when maintaining and/or reinstalling the product.
Failure to follow all safety precautions and instructions may
result in property damage, serious injury, or death to you or others.
-3-
C. Secure the mounting bracket to the dash
with (2 each) 1/4-20 x 3/4 hex head screws, 1/4 split
lockwashers and 1/4-20 hex nuts as shown in figure
3-1.
3-1. UNPACKING.
After unpacking the Model PA300, examine it
for damage that may have occurred in transit. If the
equipment has been damaged, file a claim immediately with the carrier stating the extent of damage.
Carefully check all envelopes shipping labels and
tags before removing or destroying them.
D. Secure the PA300 unit to the mounting
bracket with black 1/4-20 x 7/16 hex head screws and
1/4 split lockwashers.
3-2. MOUNTING BRACKET.
E. Tilt the unit to the desired position. Tighten
the black 1/4-20 x 7/16 hex head screws.
WARNING
3-3. POWER CABLE INSTALLATION.
When installing equipment inside air bag
equipped vehicles, the installer MUST
ensure that the equipment is installed
ONLY in areas recommended by the vehicle
manufacturer.
The power cable included in the carton is
equipped with a twelve-prong plug (P5) that mates
with the connector (J5) on the rear of the electronic
siren (see figure 3-2). The various wires on the
connector must be connected as follows:
Failure to observe this warning will reduce
the effectiveness of the air bag, damage the
air bag, or potentially damage or dislodge
the equipment, causing serious injury or
death to you or others.
WARNING
Failure to observe this WARNING may
result in fire, burns or blindness.
If shorted to vehicle frame, high current
conductors can cause hazardous sparks
resulting in electrical fires or molten
metal.
The PA300 comes equipped with a swinging
bracket which enables it to be mounted in variety of
positions. Positioning the bracket above the unit
allows mounting to the underside of the dash. Positioning the bracket below the unit will permit mounting on any horizontal surface.
DO NOT connect this system to vehicle
battery until ALL other electrical connections are made and mounting of all
components is complete.
The unit should be mounted in a position that
is both comfortable and convenient to the operator.
Keep visibility and accessibility of controls in mind.
To install the unit under the dash, determine the
mounting location and proceed as follows (see figure
3-1).
Verify that no short circuits exist, before
connecting to the Positive (+) battery
terminal.
CAUTION
The unit must be installed in an adequately
ventilated area. Never install near heater
ducts.
A. Use one of the mounting brackets as a
template and scribe two drill positioning marks at
the selected mounting location under the dash.
CAUTION
Before drilling holes in ANY part of a
vehicle, be sure that both sides of the
mounting surface are clear of parts
that could be damaged; such as brake
lines, electrical wiring or other vital
parts.
B. Drill two 1/4-inch diameter holes at the
position marks.
Figure 3-1. installation of PA300 Under Dash.
-4-
CAUTION
The horn ring transfer circuit of the siren
is capable of switching a maximum of 2amperes. Some vehicles do not have a horn
relay and, consequently, will draw more
than 2-amperes when the vehicle horn is
activated. Consult your vehicle service
manual or a qualified mechanic to determine the current required to activate the
horn. If it is less than 2-amperes, perform
the procedure in step 3. If it is greater than
2-amperes, perform steps 4 through 10.
Figure 3-2. Rear View of PA300.
A. Speaker.
CAUTION
Connecting a low power speaker (58W), or
two speakers, to the unit will damage the
siren or speaker(s). Always use one 11-ohm,
high power (100W) speaker.
3. Splice the white control cable wire (P5,
pin 10) to the horn side of the cut wire. Insulate the
splice with a wire nut.
The unit is designed to operate with one 11ohm, high power (100W) speaker.
4. Obtain a SPST relay of sufficient contact
current capacity to activate the vehicle horn. Refer to
figure 3-4 while performing the following steps.
Connect the speaker leads (18 gauge wire)
as shown in Control Cable Wiring Diagram, figure
3-3.
5. Mount the relay in a suitable location.
6. Connect the horn side of the wire cut in
step 1 to the relay contact terminal.
B. Radio.
To allow incoming radio messages to be
rebroadcast over the outside speakers, connect the
two brown zip cord leads (P5, pins 9 and 12) across
the two-way radio’s speaker.
7. Determine the “sense” of the vehicle’s
horn ring activation circuit, i.e., does the horn circuit
require a switched positive voltage or switched
ground for activation.
C. Horn Ring.
8. Connect the relay wiper terminal to the
positive or negative potential determined in step 7.
In order to utilize the Tap II and Press-andHold features of the siren, the following procedure
must be performed.
9. Connect the white control cable wire to
one end of the relay coil.
1. Locate the wire that connects the vehicle
horn ring switch to the horn or horn relay. Cut this
wire.
10. Connect the other end of the relay coil to
the opposite potential of that connected to the wiper
in step 8.
2. See figure 3-4. Splice the white/yellow
control cable wire (P5, pin 7) to the horn ring side of
the wire that was cut in step 1. Insulate the splice
with the wire nuts (supplied).
D. Connection to Power Source.
The PA300 can operate from any 12-volt
positive or negative ground vehicle electrical system.
Figure 3-3. Control Cable Wiring Diagram.
Figure 3-4. Horn Ring Connections.
-5-
Therefore, before making any electrical connections,
determine the polarity of the vehicle electrical system
ground.
the battery. If necessary, additional #14 gauge or
heavier wire can be spliced to the red lead.
WARNING
Power for the siren can be obtained from the
vehicle’s power distribution center or directly from
the vehicle battery. If power is going to be obtained
directly from the vehicle battery, drill a hole in the
vehicle firewall for the power lead to enter the engine
compartment. Place a grommet or similar device in
the hole to pro-tect the wire against damage from
rough edges.
If wires are shorted to the vehicle frame or
each other, high current conductors can cause
hazardous sparks resulting in electrical fires
and molten metal.
Verify that no short circuits exist before
connecting to the Positive (+) battery terminal.
DO NOT connect this system to the vehicle
battery until ALL other electrical connections
are made and mounting of all components is
complete.
CAUTION
Before drilling holes in ANY part of the
vehicle, ensure that both sides of the surface
are clear of parts that could be damaged;
such as brake lines, fuel lines, electrical
wiring or other vital parts.
Failure to observe this WARNING will result
in fire, burns and blindness.
d. Connect the in-line fuseholder
lead to the positive (+) battery terminal.
If your vehicle has a negative ground electrical system, perform the procedure in paragraph 1.
Perform the procedure in paragraph 2, if the vehicle
has a positive ground system.
1.
e.
Connect the black wire to the
negative terminal of the battery.
2.
Negative Ground.
Positive Ground.
a. Connect the green (P5, pin 5)
control cable lead to the vehicle chassis as close as
practical to the siren. Scrape paint away from the
selected bolt hole to ensure a good electrical connection to the chassis.
a. Connect the green (P5, pin 5)
control cable lead to the vehicle chassis as close as
practical to the siren. Scrape paint away from the
selected bolt hole to ensure a good electrical connection to the chassis.
b. Route the black (P5, pin 4) and
the red (P5, pin 6) control cable leads, through the
previously drilled hole, into the engine compartment.
Route the wire through existing clamps and holders
toward the battery.
b. Route the red (P5, pin 6) and the
black (P5, pin 4) control cable leads, through the
previously drilled hole, into the engine compartment.
Route the wires through existing clamps and holders
toward the battery.
c.
To protect the black wire when
connected to the battery terminal, use an in-line
fuseholder and 20-ampere fuse (not supplied). The
fuseholder should be installed as close as practical to
the battery. If necessary, additional #14 gauge or
heavier wire can be spliced to the black lead.
c.
To protect the red wire when
connected to the battery terminal, use an in-line
fuseholder and 20-ampere fuse (not supplied). The
fuseholder should be installed as close as practical to
-6-
the microphone push-to-talk switch, speak in a
normal voice, and adjust the GAIN control for the
desired sound level outside the vehicle. Turn-on the
vehicle’s two-way radio and adjust the volume to a
comfortable listening level inside the vehicle. Then
set the Selector switch to RADIO. Stand outside of
the vehicle and note the radio rebroadcast loudness.
If the sound volume is too loud or too soft, adjust R11
through the hole at the bottom of the siren (see figure
3-6) to the desired sound level.
WARNING
If wires are shorted to the vehicle frame or
each other, high current conductors can cause
hazardous sparks resulting in electrical fires
and molten metal.
Verify that no short circuits exist before
connecting to the Positive (+) battery terminal.
After the adjustment is completed, the loudness
of the radio rebroadcast and public address may be
varied with the front panel GAIN control.
DO NOT connect this system to the vehicle
battery until ALL other electrical connections
are made and mounting of all components is
complete.
3-6. TESTING AFTER INSTALLATION.
Failure to observe this WARNING will result
in fire, burns and blindness.
WARNING
d. Connect the in-line fuseholder
lead to the negative (hot) battery terminal.
All effective sirens and horns produce loud
sounds (120 dB) that may cause permanent
hearing loss. Always minimize your exposure
to siren sound and wear hearing protection.
Do not sound the siren indoors or in enclosed
areas where you and others will be exposed to
the sound.
e.
Connect the red wire to the
positive terminal of the battery.
3-4. AIR HORN PRESS-AND-HOLD
MODIFICATION.
After installation; test the electronic siren,
including horn operation, to ensure that it is operating properly.
The unit comes from the factory set so that the
peak-and-hold sound will be heard when the Selector
switch is set to MANUAL and the vehicle horn ring is
activated. To change the sound to air horn, merely
move jumpers JU1 and JU2 from the “PEAK” position on the P.C. board to the “AIR” position (see
figure 3-5).
After testing is complete, provide a copy of this
manual to all operating personnel.
3-5. RELATIVE PA LOUDNESS ADJUSTMENT.
After the PA300 is completely installed in the
vehicle, set the Selector switch to MANUAL. Depress
Figure 3-5. Press and Hold Modification.
Figure 3-6. Relative PA Loudness Adjustment.
-7-
SECTION IV
OPERATION
SAFETY MESSAGE TO OPERATORS OF
FEDERAL SIGNAL ELECTRONIC SIRENS
AND LIGHT/SOUND SYSTEMS
WARNING
•
The lives of people depend on your safe operation of Federal products. It is important to
read and follow all instructions shipped with
the products. In addition, listed below are
some other important safety instructions and
precautions you should follow:
Signaling Limitations
•
Be aware that the use of your visual and audible signaling devices does not give you the
right to force your way through traffic. Your
emergency lights, siren, and actions are
REQUESTING the right-of-way.
•
Although your warning system is operating
properly, it may not alert everyone. People
may not hear, see, or heed your warning signal.
You must recognize this fact and continue
driving cautiously.
•
Situations may occur which obstruct your
warning signal when natural or man-made
objects are between your vehicle and others.
This can also occur when you raise your hood
or trunk lid. If these situations occur, be especially careful.
Qualifications
•
To properly use an electronic siren and
speaker(s): you must have a good understanding
of general vehicle operation, a high proficiency
in the use of safety warning equipment, and
thorough knowledge of state and federal
UNIFORM TRAFFIC CODES.
Sound Hazards
•
•
Your hearing and the hearing of others, in or
close to your emergency vehicle, could be damaged by loud sounds. This can occur from short
exposures to very loud sounds, or from longer
exposures to moderately loud sounds. For
hearing conservation guidance, refer to federal,
state, or local recommendations.
OSHA Standard 1910.95 offers guidance on
“Permissible Noise Exposure.”
Driving Limitations
All effective sirens and horns produce loud
sounds (120 dB) that may cause permanent
hearing loss. Always minimize your exposure to
siren sound, roll up your windows and wear
hearing protection. Do not sound the siren
indoors or in enclosed areas where you and
others will be exposed to the sound. Only use
the siren for emergency response situations.
Sound Limitations
•
•
Frequently inspect the speaker to ensure that
it is clear of any obstruction, such as mud or
snow, which will reduce maximum sound
output.
Before using the vehicle, check to see if the
siren speakers are concealed from view. If the
siren speaker is not in clear view on the front of
the vehicle, use extra caution when operating
the vehicle. A concealed siren speaker installation is less effective at warning others.
•
At the start of your shift, you should ensure
that the light/sound system is securely attached
to the vehicle and operating properly.
•
If the unique combination of emergency vehicle
equipment installed in your vehicle has
resulted in the siren controls being installed
in a position that does not allow you to operate
them by touch only, OPERATE CONTROLS
ONLY WHILE YOUR VEHICLE IS STOPPED.
•
If driving conditions require your full attention, you should avoid operating the siren
controls while the vehicle is in motion.
Continuing Education
•
Maximum sound output will be severely reduced if any objects are in front of the speaker.
If your installation has obstructions in front
of the speaker, drive even more cautiously.
File these instructions in a safe place and
refer to them periodically. Give a copy of these
instructions to new recruits and trainees.
Failure to follow these safety precautions may
result in property damage, serious injury, or death to
you, to passengers, or to others.
-8-
4-1. GENERAL.
C. WAIL.
All controls utilized during normal operation of
the Model PA300 are located on the front panel (see
figure 4-1).
In this position, the siren produces a continuous “wailing” sound, up and down in frequency.
D. YELP.
The wired-in noise cancelling microphone provides high quality voice reproduction in the public
address mode. The microphone push-to-talk switch
will override all siren functions, except radio rebroadcast, for instant PA use.
In this position; a continuous, rapid “warbled” tone is generated.
E. HI-LO.
4-2. GAIN CONTROL.
In this position, a two-tone sound will be
heard. This distinctive tone may be reserved for any
special indication or situation.
The GAIN control is used to turn the siren on
and off. Also, it is used to control the volume when
the siren is used for public address or radio amplification. Clockwise rotation of the knob increases voice
volume in the public address or radio amplification
mode. The GAIN control does not control the volume
of the siren signals.
4-4. HORN/SIREN SWITCH.
The HORN/SIREN switch, located on the left
side of the front panel, activates the electronic air
horn sound (up) or peak-and-hold sound (down) in
any siren mode except radio.
The maximum clockwise setting of the control
will be determined, in most cases by the point at
which feedback or “squeal” occurs. This will depend
upon the microphone gain, open windows, speaker
placement, proximity of reflecting surfaces (building
or other vehicles), etc. Adjust the GAIN control to a
position just below the point at which feedback
occurs or as desired.
4-5. TAP II FUNCTIONS.
Tap II allows the driver to change the siren
sound via the vehicle’s horn ring. This feature is
especially effective for clearing traffic. The chart
below demonstrates how the horn ring can be used to
change the siren sound:
4-3. SELECTOR SWITCH.
TAP II FUNCTIONS
The Selector switch is a five-position rotary
switch used to select the mode of operation. The
following are positions on the Selector switch.
Selector
Switch
Position
A. RADIO.
In this position, incoming radio messages
are amplified by the siren and rebroadcast over the
outside speaker.
Wail
Yelp
First Horn
Ring Tap
Produces
Yelp
Wail
Second Horn
Ring Tap
Produces
Wail
Yelp
4-6. PRESS AND HOLD FUNCTIONS.
B. MANUAL.
Additional alternate sounds can be activated in
two other Selector switch positions, by depressing
and holding the horn ring for as long as the alternate
sound is desired. The chart below shows these
additional “Press and Hold” functions:
In this position, it is possible to operate the
siren by activating the HORN/SIREN switch. The
siren can also be activated by means of an auxiliary
switch, such as the horn ring button (refer to paragraph 4-6).
PRESS AND HOLD FUNCTIONS
Selector
Switch
Position
Hi-Lo
Manual
Figure 4-1. Front View.
-9-
Press on
Horn Ring
Produces
Release of
Horn Ring
Produces
Air Horn
Peak and
Hold or
Air Horn
Hi-Lo
Coast down
and silence
or silence
SECTION V
CIRCUIT DESCRIPTION
the control pin (IC10-6) goes low putting the switch
in a high impedance state (OFF), and allows the RC
rate capacitor (C11) to charge as the siren tone
peaks.
5-1. GENERAL.
The Model PA300 circuitry can be divided into
seven functional blocks. Refer to figure 5-1 and 6-4
while reading the following paragraphs.
IC12B, another astable oscillator, generates the
control voltage required to generate the air-horn
sound. Normally, IC12B is held in the reset state
(IC12-10 low) until the air horn control line is pulled
high.
5-2. RATE OSCILLATORS AND VOLTAGE
CONTROLLED OSCILLATOR.
The heart of the Model PA300 circuitry is the
rate oscillator and VCO sections. The rate oscillator
not only determines the cycling rate of each siren
tone, but also generates the control voltage that
operates the voltage controlled oscillator (VCO). The
VCO generates a square-wave output whose frequency is directly proportional to the control voltage.
The output of the VCO is coupled to the siren’s power
output amplifier.
IC8C, a one-of-two analog switch, selects the
siren or air horn control voltage from IC12A or
IC12B. IC8B selects either the RC control voltage
(manual, wail and yelp modes) or the square wave
control voltage (hi-lo) derived from the output of
IC12A. The voltage divider network of R27, R28, R29
and CR8 provides the DC level shifting of the IC12A
output necessary to obtain the desired hi-lo tone
frequencies.
The siren rate oscillator consists of an LM556
dual timer configured as two astable oscillators. The
first astable oscillator (IC12A) employs analog
switches (IC10A , IC10B) to select the resistance for
the RC timing network which determines the astable
oscillator’s cycling rate. IC10C , another analog
switch, connects the discharge pin of IC12A to the RC
timing network. When the peak function is called for,
IC13, a phase-locked loop, contains the voltage
controlled oscillator. C21, R46, R47, R57, and the
control voltage on pin 9 determine the output frequency.
Figure 5-1. Functional Block Diagram.
-10-
As the siren coasts down in the manual mode,
the output of the VCO must be disabled to prevent
frequencies lower than 350Hz from damaging the
amplifier’s output transistors. IC4D, a voltage
comparator, compares the VCO control voltage to the
low frequency reference voltage set by R40 and R41.
When the VCO control voltage drops below the
reference, IC4-8 goes high and forces the inhibit pin
of the VCO high through OR gate IC9D. The VCO is
also inhibited when the radio or microphone push-totalk input is selected. These logic inputs are gated
through IC7B, IC9C and IC9D to the VCO inhibit
pin.
siren function, as long as the horn ring switch is
depressed.
If manual or hi-lo is the selected mode and JU1
and JU2 are set to “AIR”, the window comparator
output will be passed through AND gate IC5D to
activate the air horn override circuitry (refer to
paragraph 5-2).
5-5. AUDIO SELECTOR AND POWER AMPLIFIER.
The siren has two audio inputs: radio rebroadcast and microphone public address.
The radio input is derived from direct connection to the radio speaker. A fraction of the audio
voltage developed across the radio balance potentiometer (R11) is applied to the input of a differential
amplifier (IC4C). The differential amplifier eliminates any ground reference problem that may exist
between the PA300 and various makes of radios. The
microphone has a built-in transistor amplifier and
therefore requires no external pre-amplifier. Resistor
R14 serves as the collector bias resistor for the
microphone’s amplifier. The microphone output,
derived from J2-1, and the radio audio from IC4C are
selected via 1 of 2 analog switch IC8A. Normally, the
microphone audio is gated through the multiplexer
unless the Selector switch is set to the RADlO
position. The selected audio is applied to IC11-2.
5-3. SIREN MODE CONTROL.
The siren mode is controlled by the logic levels
applied to J2-3, 5, 6, 7, 8 and J3-1, 2 and 7 (via
Selector switch SW2), HORN/SIREN switch SW3,
and the microphone push-to-talk switch. IC2 buffers
the control inputs. IC3 and IC9 provide most of the
decoding necessary to control the rate oscillator and
analog switching of the audio and VCO control
voltages.
5-4. TAP II CONTROL.
As long as power is applied to the siren circuitry, the vehicle’s horn ring switch will be connected through P3-5 and K1A to the inputs of a
window comparator consisting of IC4A and IC4B. A
positive or negative horn ring contact will result in a
logic “1” pulse of equal duration at the junction of
CR1 and CR2.
IC11 is an audio power amplifier integrated
circuit which provides the necessary power gain to
drive the push-pull amplifier stages beyond driver
transformer T1. A biasing network consisting of TH1,
CR15, Q4, R52, R53 and R54 is activated whenever
the radio or the microphone push-to-talk switch is
activated. This eliminates all “crossover” distortion
associated with the push-pull output amplifier.
When the siren is in the wail or yelp mode, the
horn ring pulse passes to the input of IC6A, is “debounced”, and then applied to toggle flip-flop IC6B.
Every time the horn ring is operated, the output of
IC6B (pin 5) changes state and inverts the state of
the yelp control line. (The exclusive OR gate contained in IC13 functions as a controlled inverter
where a logic “1” present on pin 3 forces the output
(pin 2) to Y or “yelp not”.)
5-6. 8-VOLT REGULATOR, POWER CONTROL
AND HORN RING TRANSFER.
When the GAIN control (on/off switch) is
rotated clockwise, B+ is applied to the circuit board
via J3-4 and J4-4. The networks consisting of CR4,
C6 and CR10, R36, C17 provide filtering of the B+
voltage for the 8-volt regulator (IC1) and the audio
amplifier (IC11). The large capacitances employed
insure that all control logic remains stable and
prevents “popping” noises heard through the loudspeaker when power is turned off.
If the Selector switch mode is changed during a
Tap II operation, the circuitry consisting of IC7A,
IC5B and IC7C resets the toggle flip-flop (IC6B) and
allows the true state of the yelp control line to pass to
the rate oscillator section. This is necessary to insure
that the Selector switch position corresponds to the
audible siren tone produced.
Q1, Q2, Q3 and associated components form
the power-on control circuitry. This network delays
the activation of K1 approximately one-second after
B+ is applied. During the interim, all siren control
logic stabilizes allowing C15 to charge, bypassing the
primary of driver transformer T1. This circuitry
suppresses loud turn-on “thumps” from the loudspeaker and allows the vehicle horn ring switch to
operate the siren’s Tap II feature.
NOTE
The reset circuitry relies on the fact that the
Selector switch is of the non-shorting type.
When the siren is in the manual mode, and
JU1 and JU2 are left connected to “PEAK” (factory
setting), the window comparator output will be
passed through AND gate IC5C to activate the peak
-11-
SECTION VI
SERVICE AND MAINTENANCE
•
SAFETY MESSAGE TO PERSONNEL SERVICING
FEDERAL SIGNAL ELECTRONIC SIRENS
WARNING
The lives of people depend on your proper servicing of Federal products. It is important to read
and follow all instructions shipped with the
products. In addition, listed below are some
other safety instructions and precautions you
should follow:
•
Read and understand all instructions in this
manual before servicing the electronic siren
or speaker.
•
To properly service an electronic siren or
speaker: you must have a good understanding
of automotive electrical procedures and systems,
along with proficiency in the installation and
service of safety warning equipment. Always
refer to the vehicle's service manuals when
performing service on a vehicle.
•
Electronic circuit and speaker repairs must be
performed by a qualified and competent electronic technician.
•
Your hearing and the hearing of others, in or
close to your emergency vehicle, could be damaged by loud sounds. This can occur from short
exposures to very loud sounds, or from longer
exposures to moderately loud sounds. For
hearing conservation guidance, refer to federal,
state, or local recommendations.
OSHA Standard 1910.95 offers guidance on
“Permissible Noise Exposure.”
•
DO NOT connect this system to the positive
terminal of the battery until servicing is complete, and you have verified that there are no
short circuits to ground.
•
In order for the electronic siren to function
properly, the ground connection must be made
to the NEGATIVE battery terminal.
•
Failure to follow all safety precautions and
instructions may result in property damage, serious
injury, or death to you or others.
6-1. GENERAL.
Most of the component electronic parts used in
the Model PA300 are standard items that can be
obtained from any TV or electronics supply shop. In
order to reduce equipment down-time. Federal
recommends that the entire printed circuit board
(Part No. 200C860) be replaced. The printed circuit
boards are relatively inexpensive allowing you to
keep an adequate supply in your repair shop.
The diagrams in this section should be an aid
to a repairman in isolating a malfunction and locating components.
The factory can and will service your equipment or assist you with technical problems, should
any arise, that cannot be handled satisfactorily and
promptly locally.
Communications and shipments should be
addressed to:
All effective sirens and horns produce loud
sounds (120 dB) that may cause permanent
hearing loss. Always minimize your exposure
to siren sound and wear hearing protection.
Do not sound the siren indoors or in enclosed
areas where you and others will be exposed to
the sound.
•
Federal Signal siren amplifiers and speakers
are designed to work together as a system.
Combining a siren and speaker from different
manufacturers may reduce the warning effectiveness of the siren system and may damage
the components. You should verify or test your
combination to make sure the system works
together properly and meets both federal, state
and local standards or guidelines.
Service Department
Federal Signal Corporation
2645 Federal Signal Drive
University Park, IL 60466
1-800-433-9132
If any unit is returned for adjustment or repair,
it can be accepted only if we are notified by letter or
phone in advance of its arrival. Such notice should
clearly indicate the service requested and give all
pertinent information regarding the nature of malfunction and, if possible, its cause.
6-2. SIREN.
A. General.
After repair, test the electronic siren and
speaker system to ensure that it is operating
properly.
Any competent TV repairman or electronic
technician should have little difficulty in tracing and
-12-
correcting a malfunction, should any occur. For
emergency replacement of any of the small components, care must be used when soldering. Heat easily
impairs transistors, capacitors and circuit boards. It
is therefore advisable to use longnose pliers or a
similar heat sink on the lead being soldered.
have a detrimental effect on the output transistors,
and is therefore not recommended.
Federal recommends that both output
transistors be replaced should only one device prove
to be defective. This practice will ensure long periods
of service between failures.
If IC13 or C21 are replaced, it may be necessary to adjust R57. With the Selector Switch set to
MANUAL, hold the paddle switch in the SIREN
position and adjust R57 for 1510 Hz ±10 Hz at the
siren output.
When installing new output transistors,
ensure that the Sil-Pad insulators are installed
between the heat-sink and transistors.
CAUTION
B. Removal for Servicing.
Make certain that the speaker is not defective prior to installing the repaired PA300.
When removing the chassis for servicing,
loosen the two hexagon head screws on the underside
of the unit, near the front edge. Slide the entire
chassis out of the case as shown in figure 6-1.
6-3. TESTING AFTER SERVICE.
WARNING
All effective sirens and horns produce loud
sounds (120 dB) that may cause permanent
hearing loss. Always minimize your exposure
to siren sound and wear hearing protection.
Do not sound the siren indoors or in enclosed
areas where you and others will be exposed to
the sound.
C. Removal of Circuit Board.
The PC board is secured to the chassis by
four Phillips head screws. Unplug the four wafer
connectors and microphone before removing the
screws.
D. Replacement of Output Transistors.
After installation; test the electronic siren,
including horn operation, to ensure that it is operating properly.
Failure of one or both of the output transistors (Q7, Q8) is usually the result of a defective
speaker (short circuited voice coil). Rebroadcast of
unsquelched radio or music for long periods will also
After testing is complete, provide a copy of this
manual to all operating personnel.
-13-
Figure 6-1. Chassis Removal.
Figure 6-2. Internal View.
-14-
-15Figure 6-3. Component Location Diagram.
-16Figure 6-4. Schematic Diagram.
PARTS LIST
Schematic
Symbol
Description
Schematic
Symbol
Part No.
*RESISTORS
R1, 4, 14, 15
R2, 5, 6, 42, 45
R3
R7, 17, 18, 19,
22, 33, 44
R8
R9, 12
R10, 13, 20
R11
R16, 30
R21, 55
R23, 31, 32,
34, 38
R24
R25
R26
R27, 41
R28
R29
R35
R36, 49, 50
R37
R39
R40
R43, 47
R46
R48, 51
R52
R53
R54
R56
R57
R58
4700 Ohm
100K Ohm
27K Ohm
10K Ohm
100A298
100A262
100A244
100A257
68K Ohm
36K Ohm
15K Ohm
2K Ohm, Potentiometer
18K Ohm
5600 Ohm
1000 Ohm
100A261
100A275
100A239
106A203A-01
100A258
100A253
100A233
4.7K Ohm, 2%
100A713
22K Ohm, 2%
82K Ohm, 2%
33K Ohm
47K Ohm
68K Ohm, 2%
27 Ohm
10 Ohm
10K Ohm, Potentiometer, GAIN
10K Ohm
56K Ohm
1.5 Megohm
68K Ohm
150 Ohm
27 Ohm
8.2 Ohm
270 Ohm, 2 watt, Wirewound
2700 Ohm
200K Ohm, Potentiometer
470 Ohm
100A797
100A789
100A211
100A228
100A775
100A290
100A251
106A116
100A257
100A229
100A217
100A261
100A238
100A290
100A234
103A128
100A256
106A203A-03
100A248
IC1
IC2
IC3, IC9
IC4
IC5
IC6
IC7
IC8
IC10
IC11
IC12
IC13
Q1
Q2, 3, 4
Q5, 6
Q7, 8
J1, 2, 3, 4
J5
H1, 2, 3, 4
P5
K1
Z1
RT1
T1
T2
F1
DS1
SW2
SW3
TB1
107A263
108A143
108A142
108A149
107A634
108A144
107A1103
107A677A-02
107A211
108A147
107A1101
107A766
107A211
108A122
TI55
115B101
ED3002S
115B301
1N4738, 8.2V, Zener
Rectifier, 6 amp. 50V
115A232
115A317
128A097
128A092A-01
128B082
128A098
128A077
128A044
128A100
128A099
128A047
128A046
128A038-01
128B079
TIS93, PNP
TIS92, NPN
2N6109, PNP
2N5885, NPN, Power
125B133
125B132
125B431
125B432
MISCELLANEOUS
DIODES
CR1, 2, 3, 6,
7, 8, 9, 11
CR4, 5, 10,
13, 14, 15
CR16
CR17
UA78MO8CKC
CD4050BE
MC14071BCP
LM324N
MC14081BCP
MC14027BCP
MC14069UBCP
MC14053BCP
MC14066BCP
LM380N
NAT LM556
MC14046BCP
TRANSISTORS
CAPACITORS
0.001UF, 500V, Disc
10UF, 16V, Electrolytic
2.2UF, 25V, Electrolytic
1000UF, 35V, Electrolytic
10UF, 10V, Tantalum
22UF, 16V, Electrolytic
0.1UF, 35V, Tantalum
22UF, 15V, Tantalum
0.005UF, 100V, Disc
150UF, 16V, Electrolytic
0.22UF, Radial Tantalum
0.15UF, 5%, 100V, Poly
0.005UF, 100V, Disc
500UF, 15V, Electrolytic
Part No.
INTEGRATED CIRCUITS
*Unless otherwise specified, all RESISTORS are
carbon type, ±5%, 1/4 watt.
C1, 2, 18, 22, 23
C3, 20
C4, 5, 13
C6, 17
C7, 8, 12, 16
C9
C10
C11
C14
C15
C19
C21
C24, 25
C26
Description
-17-
Connector, Wafer
Connector, 12-pin
Terminal, Male
Plug, 12-pin
Relay, 180 Ohm, 12V, DPDT
Resistor Network, 9 x 10K
Thermistor, 200 Ohm
Transformer, Driver
Transformer, Output
Fuse, 15A, 3AG, 32V
Lamp, 14V, Green
Switch, Rotary
Switch, Paddle
Terminal, Strip
Microphone
Socket, Transistor (Q7, Q8)
Socket, Lamp (DS1)
Holder, Fuse (F1)
Knob, GAIN control
Knob, Selector
Insulator (Q7, Q8)
Circuit Board (without parts)
Circuit Board (with parts installed)
Standoff
Bracket, Lamp
Bracket, Mounting
Bracket, Transistor (Q7, Q8)
Accessory Kit
Housing
Wire Harness
140A170
139A152
233A106
140A154
131A130A-01
100A801
104A111
120B145
120C151A-01
148A107
149A121A
122B215
122A214
229A127
258B577-01
138A125
138A126B
143A106
141A102
141A111
235A123A-01
130C301B
200C860
230A123
8536A025
8536B022
8537B303
8537A301A
8537C002
175B434
255A198M
REV. M 901
Printed in U.S.A.
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