Figure 3.7 Jumper Setting For Gnd Activation Of Horn Ring Circuit - Federal Signal Corporation Smart Siren Installation And Maintenance Manual

DETERMINE CURRENT FOR HORN—The horn ring transfer circuit of the
siren can switch a maximum of 5 A. Some vehicles do not have a horn
relay and consequently will draw more than 5 A 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 5 A,
perform step 3. If it is greater than 5 A, perform steps 4 through 11.
3.
Splice the WHITE wire from the power cable to the horn side of the cut wire.
4. Mount the SPST relay in a suitable location.
5. Connect the horn side of the wire cut in step 1 to the relay-contact terminal .
6.
Determine the "sense" of the vehicle's horn-ring activation circuit. Does the horn circuit require a
switched positive voltage or switched ground for activation?
7.
By default, the horn-ring transfer circuit is set through jumper J9 in the siren amplifier to be
activated by GND. To change the circuit to +12 V activation, move the jumper (J9) from the
+ HORN position to the – RING position (Figure 3.7).

Figure 3.7 Jumper setting for GND activation of HORN RING circuit

9.
Connect the switched relay-contact terminal to the positive or negative potential you determined
in step 6.
10. Connect the WHITE wire from cable assembly P/N 14610907 to one end of the relay coil.
11. Connect the other end of the relay coil to the opposite potential of that connected to the switched
relay-contact terminal in step 9.
12. Insulate the spliced leads with butt-spliced wire connectors. Fold and seal unused leads.
J9
J7
J8
PA300-CN Siren Amplifier
Chapter 3: Connecting the PA300-CN System
290A6791
+ HORN
JUMPER SETTING
FOR +12 V ACTIVATION
OF CIRCUIT
GND DEFAULT
− RING
SETTING IS WHITE
ON PIN BASE.
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