Code 3 Scorpion Siren User Manual
INSTALLATION
& OPERATION
MANUAL
3900 AND 3930
SERIES SIREN
3900 MODEL SERIES SIRENS
WITH & WITHOUT PUBLIC ADDRESS & RADIO RE-BROADCAST
NOTE: References to Public Address (PA) and Radio Re-Broadcast (RRB) features,
adjustments & replacement parts, do not apply to all models.
Contents:
Introduction .......................................................... 2
Standard Features ............................................... 2
Unpacking & Pre-Installation ............................... 3
Installation & Mounting ........................................ 3
Set-Up and Adjustment ....................................... 6
Operation ............................................................. 7
Options ................................................................. 8
Specifications ....................................................... 8
Maintenance ........................................................ 9
Troubleshooting ................................................. 10
Parts List ............................................................ 12
Exploded View ................................................... 14
Warranty ............................................................. 16
IMPORTANT:
Read all instructions and warnings before installing and using.
INSTALLER: This manual must be delivered to the end user of this equipment.
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Introduction
The 3930 series siren is a new series of electronic sirens that has been designed to meet the needs of all
emergency vehicles. This series of sirens incorporates a rugged extruded aluminum package along with
microprocessor based circuitry and MOSFET technology. Advanced features such as Park Kill, Instant
"ON", Adjustable Backlighting, "Horn Ring Scroll" and more, make the 3930 series sirens extremely
versatile.
Sirens are an integral part of an effective audio/visual emergency warning system.
However, sirens are only short range secondary warning devices. The use of a siren
does not insure that all drivers can or will observe or react to an emergency warning
WARNING!
signal, particularly at long distances or when either vehicle is traveling at a high rate of
speed. Sirens should only be used in a combination with effective warning lights and
never relied upon as a sole warning signal. Never take the right of way for granted. It is
your responsibility to be sure you can proceed safely before entering an intersection,
driving against traffic, or responding at a high rate of speed.
The effectiveness of this warning device is highly dependent upon correct mounting and
wiring. Read and follow the manufacturer’s instructions before installing or using this
device. The vehicle operator should check the equipment daily to insure that all features
of the device operate correctly.
To be effective, sirens must produce high sound levels that potentially can inflict hearing
damage. Installers should be warned to wear hearing protection, clear bystanders from
the area and not to operate the siren indoors during testing. Vehicle operators and
occupants should assess their exposure to siren noise and determine what steps, such
as consultation with professionals or use of hearing protection should be implemented to
protect their hearing.
This equipment is intended for use by authorized personnel only. It is the user’s responsibility to understand and obey all laws regarding emergency warning devices. The user
should check all applicable city, state and federal laws and regulations.
Public Safety Equipment, Inc., assumes no liability for any loss resulting from the use of
this warning device.
Proper installation is vital to the performance of the siren and the safe operation of the
emergency vehicle. It is important to recognize that the operator of the emergency
vehicle is under psychological and physiological stress caused by the emergency
situation. The siren system should be installed in such a manner as to: A) Not reduce the
acoustical performance of the system, B) Limit as much as practical the noise level in the
passenger compartment of the vehicle, C) Place the controls within convenient reach of
the operator so that he can operate the system without losing eye contact with the
roadway.
Emergency warning devices often require high electrical voltages and/or currents.
Properly protect and use caution around live electrical connections. Grounding or
shorting of electrical connections can cause high current arcing, which can cause
personal injury and/or severe vehicle damage, including fire.
PROPER INSTALLATION COMBINED WITH OPERATOR TRAINING IN THE PROPER USE
OF EMERGENCY WARNING DEVICES IS ESSENTIAL TO INSURE THE SAFETY OF
EMERGENCY PERSONNEL AND THE PUBLIC.
Standard Features
The 3930 series sirens consist of integrated controls and amplifier in a single package. The siren is available
in two models as follows:
The following features are standard on Model 3930 sirens:
Siren Tones - Industry standard Wail, Yelp, and HyperYelp tones.
AIR HORN Tone - Electronic AIR HORN sound.
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Instant-On- There is no " ON/OFF " switch. Selecting any siren function, or keying the microphone will
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activate the siren assuming the siren is connected to a source of +12V.
Automatic Short Circuit Protection- The siren will sense a short circuit on the speaker terminals and
automatically go to standby until the fault is removed. Once the fault is removed the siren will return to normal
operation.
Instant Public Address - Public Address override of all siren functions when the microphone Push-to-Talk
(PTT) key is pressed.
Noise Cancelling Microphone - Wired in microphone that is easily unplugged internally for service or
replacement.
In addition to the standard features of the Model 3930 siren listed above, the following features are standard
on Model 3932 sirens:
Radio Rebroadcast - Broadcasts Two-way radio reception over siren speakers. These inputs are
transformer coupled to prevent loading of the radio.
Park Kill- This feature deactivates the siren tones when the vehicle is shifted into park. Once PKILL is
activated the siren will remain deactivated until the vehicle is shifted into gear and the siren is restarted using
the Horn Ring Scroll feature or the front panel switches.
Adjustable Backlighting- Backlighting is independent of siren power. Allows connecting to dimmer if
desired.
Horn Ring (Remote) Scroll - The siren accepts either a positive or a ground (Earth) signal, usually from the
vehicle's horn switch (or other user supplied switch), and remotely scrolls through the siren tones or activates
AIR HORN function. See Set-up and Adjustments section for details.
®
InterClear
the siren mode is changed using either the control switches or the vehicle horn ring, thus allowing an
additional level of warning in situations such as intersections without the operator having to take his hands off
the wheel or his eyes off the road.
- This unique feature can be used to activate additional warning lights for 7 seconds, each time
Unpacking & Pre-installation
After unpacking your 3930 series siren, carefully inspect the unit and associated parts for any damage that
may have been caused in transit. Report any damage to the carrier immediately.
Installation & Mounting
The 3930 series siren may be mounted above the dash, below the dash, on a tunnel or in a rack with the
mounting bracket (bail) and the hardware supplied (see Fig. 1). Ease of operation and convenience to the
operator should be the prime consideration when mounting the siren and controls.
All devices should be mounted in accordance with the manufacturer’s instructions and
securely fastened to vehicle elements of sufficient strength to withstand the forces applied
to the device. Ease of operation and convenience to the operator should be the prime
consideration when mounting the siren and controls. Adjust the mounting angle to allow
maximum operator visibility. Do not mount the Control Head Module in a location that will
WARNING!
obstruct the drivers view. Mount the microphone clip in a convenient location to allow the
operator easy access. Devices should be mounted only in locations that conform to their
SAE identification code as described in SAE Standard J1849. For example, electronics
designed for interior mounting should not be placed underhood, etc.
Controls should be placed within convenient reach* of the driver or if intended for two
person operation the driver and/or passenger. In some vehicles, multiple control switches
and/or using methods such as “horn ring transfer” which utilizes the vehicle horn switch to
toggle between siren tones may be necessary for convenient operation from two positions.
*Convenient reach is defined as the ability of the operator of the siren systems to manipulate
the controls from his normal driving/riding position without excessive movement away from
the seat back or loss of eye contact with the roadway.
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The bail is mounted to the siren chassis by means of the "T" slot in
the side of the unit and the 1/4-20 hex head bolts, washers, and
nuts supplied. See Figure 1 for assembly and positioning details.
Note that once the unit is installed, removal involves only
loosening, not removing, the acorn nuts.
NOTE: Set-ups and adjustments will be made in subsequent steps,
depending upon the model and options purchased, that may
require access to the rear area of the unit. Plan the installation and
wiring accordingly.
Larger wires and tight connections will provide longer service life for components. For high
current wires it is highly recommended that terminal blocks or soldered connections be used
with shrink tubing to protect the connections. Do not use insulation displacement connectors
WARNING!
(e.g. 3M® ) Scotchlock type connectors). Route wiring using grommets and sealant when
passing through compartment walls. Minimize the number of splices to reduce voltage drop.
High ambient temperatures (e.g. underhood) will significantly reduce the current carrying
capacity of wires, fuses, and circuit breakers. Use "SXL" type wire in engine compartment.
All wiring should conform to the minimum wire size and other recommendations of the
manufacturer and be protected from moving parts and hot surfaces. Looms, grommets, cable
ties, and similar installation hardware should be used to anchor and protect all wiring.
Fuses or circuit breakers should be located as close to the power takeoff points as possible
and properly sized to protect the wiring and devices. Particular attention should be paid to the
location and method of making electrical connections and splices to protect these points
from corrosion and loss of conductivity. Ground (Earth) terminations should only be made
to substantial chassis components, preferably directly to the vehicle battery.
The user should install a circuit breaker sized to approximately 125% of the maximum Amp
capacity in the supply line to protect against short circuits. For example, a 30 Amp circuit
breaker should carry a maximum of 24 Amps.
DO NOT USE 1/4" DIAMETER GLASS FUSES AS THEY ARE NOT SUITABLE FOR
CONTINUOUS DUTY IN SIZES ABOVE 15 AMPS. Circuit breakers are very sensitive to
high temperatures and will "false trip" when mounted in hot environments or operated close
to their capacity.
Figure 1
Connections (see Figure 2)
ORANGE - Speaker - Connect to 100W ( 11 ohm ) speaker leads.
CONNECTION OF A 58 WATT SPEAKER TO THE SPKR TERMINAL WILL CAUSE THE
SPEAKER TO BURN OUT, AND WILL VOID THE SPEAKER WARRANTY!
The sound projecting opening should be pointed forward, parallel to the ground, and not
WARNING!
obstructed or muffled by structural components of the vehicle. Concealed or under-hood
mountings in some cases will result in a dramatic reduction in performance. To minimize this
reduction, mount the speaker so the sound emitted is projected directly forward and
obstruction by vehicle components such as hoses, brackets, grille, etc. is minimized.
Electromechanical sirens and electronic siren speakers should be mounted as far from the
occupants as possible using acoustically insulated compartments and isolation mountings to
minimize the transmission of sound into the vehicle. It may be helpful to mount the device on
the front bumper, engine cowl or fender; heavily insulate the passenger compartment; and
operate the siren only with the windows closed.
Each of these approaches may cause significant operational problems, including loss of siren
performance from road slush, increased likelihood of damage to the siren in minor collisions,
and the inability to hear the sirens on other emergency vehicles.
APPROPRIATE TRAINING OF VEHICLE OPERATORS IS RECOMMENDED TO ALERT
THEM TO THESE PROBLEMS AND MINIMIZE THE EFFECT OF THESE PROBLEMS
DURING OPERATIONS.
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Figure 2 - Wiring Diagram
YELLOW - REMOTE - Remote switch (Horn ring or foot switch). Circuit can be configured for both
ground (earth) or positive signals. Unit is configured at the factory to operate from a ground (earth)
signal. See page 6 for details on configuring for a +12V input.
WHITE - BACKLIGHTING - Provides +12V to siren backlighting. Connect to a vehicle circuit that is
powered when the ignition switch is " on ". If backlighting dimming is desired, connect to the dash
lights' circuit. Caution- If connected to the battery the backlighting will be active at all times.
GRAY - PARK KILL- This feature automatically deactivates siren tones when the vehicle is shifted into
PARK. Siren tones will be disabled until the vehicle is shifted out of PARK. This circuit is activated
by a negative signal. Connect this input to a circuit that is GROUNDED (Earth) when the vehicle is
shifted into PARK. It is the installer's responsibility to determine an appropriate location in
the vehicle circuitry to connect this wire.
BLUE - RRB - Connects to the two-way radio speaker.
GREEN - InterClear® (Optional) - Connect to the device or circuit that is to be activated by the
InterClear feature. The InterClear circuit is internally current limited at 1 Amp. Should your
requirements require higher currents, use the InterClear Power Booster Kit (# INTBS), available
from your Code 3 supplier.
Model 3932 has 1/4" Male Quick-Connect Printed Circuit Board Terminals power connections.
Use #14 gauge wire terminated with1/4" female, fully insulated quick-connect terminals only.
RED - (+12V) - Connect (14 guage wire) to a positive +12 volt DC source. It is recommended that the
user protect this wire with a 10 Amp fuse or circuit breaker located at the source.
BLACK - NEG - Connect (14 guage wire) to the negative terminal of the battery. This supplies ground
(earth) to the siren.
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