Whelen ALPHA24R - Manual (Page 3)

Page 3
CHASSIS
GROUND
ALPHA SIREN AMPLIFIER
BRN
YEL
-
SPEAKER
+
VEHICLE
HORN
CUSTOMER SUPPLIED SWITCHES
10 AMP FUSE (12V installation)
7.5 AMP FUSE (24V installation)
(CUSTOMER SUPPLIED)
HORN TRANSFER SWITCH
(CUSTOMER SUPPLIED)
SPDT
WHT/GRN (Horn Ring)
RED (Aux. Power)
WHT/BRN (Wail Tone)
WHT/RED (Yelp Tone)
WHT/ORG (Hands Free)
WHT/YEL (Air Horn)
BLK
RED
BATTERY
+ -
TO
HORN
RELAY
CUT
HERE
6 Position
Connector
9 Position
Connector
CAUTION
Loud siren noise can cause
hearing damage and/or loss.
Refer to OSHA Section 1910.95 prior
to putting ANY siren into service!
Wear
Protection!
ACTIVATION OF THIS
SIREN MAY DAMAGE
UNPROTECTED EARS!
Connecting to your Horn Relay:
1. Locate your vehicle’s horn relay. Now locate the wire that connects the vehicle horn to the horn relay and cut this wire.
2. Extend each end of the cut wire (using a minimum 16 gauge wire) to a user supplied SPDT horn transfer switch.
3. Connect the wire coming from the horn relay to the switch “wiper” as shown below.
4. Connect the wire coming from the horn to one side of the switch as shown below.
5. Connect the WHITE/GREEN wire from the 9-position connector to the other side of the switch as shown below.
Alpha Siren Specifications
12 Volt 24 Volt
INPUT VOLTAGE 13.5 VDC ± 20% 26.5 VDC + 20%
INPUT CURRENT (OFF) 0 mA 0 mA
INPUT CURRENT (STANDBY) 175 mA (TYP.) 250 mA (TYP.)
INPUT CURRENT (SIREN) 8 Amps (TYP.) 4 Amps (TYP.)
OUTPUT VOLTAGE 34 V RMS (MAX.) 34 V RMS (MAX.)
SPEAKER (1) 11 ohm (1) 11 ohm
OUTPUT POWER 105 WATTS (MAX.) 105 WATTS (MAX.)
@ 15 VDC @ 30 VDC
H/R VOLTAGE INPUT VOLTAGE INPUT VOLTAGE
or GROUND or GROUND
H/R CURRENT 15 mA (TYP.) 15 mA (TYP.)
OPERATING TEMP. -30° C. to +60°C. -30° C. to +60°C.
OPERATING HUMIDITY 95% Non-Condensing 95% Non-Condensing
Hands-Free Siren Activation (Default)...
The Alpha siren amplifier, when installed according to the above wiring diagram, offers the ability to activate siren tones using the
vehicle’s steering wheel horn ring. After the horn transfer switch has been set to siren operation, the hands-free mode is enabled
when switch 3 is closed. After hands-free mode is enabled, pressing the horn ring button will start the Wail siren tone. A second
press of the horn ring button will change the siren tone from Wail to Yelp. A third press will change the siren tone from Yelp to
Piercer™. The siren tones will continue to cycle from Wail to Yelp to Piercer with each subsequent press of the horn ring button.
Two, rapid presses on the horn ring button ends hands-free siren tone generation until the horn ring button is pressed again. At that
time the cycle is repeated.
To exit the hands-free mode, end current siren tone with two, rapid horn ring presses, turn off switch 3 and return the horn transfer
switch to its normal operating position. Normal vehicle horn operation is then restored.
Manual Siren Activation (Optional)...
The Alpha siren amplifier, when installed according to the wiring diagram on page 4, offers manual siren activation using the
vehicle’s steering wheel horn ring as a momentary switch. After the horn transfer switch has been set to siren operation, the horn
ring button will now activate the manual siren tone. The default manual siren tone “ramps up” to a predetermined level and
continues at that level until the manual switch is released. When the switch is released, the tone is immediately terminated.