Connecting the Convergence Network
29
Installation and Maintenance Instructions
Federal Signal www.fedsig.com
Horn Ring Transfer (Cable Assembly 17500307)
The default setting for the slide switch transfers the horn-ring activation of the
siren in Slide Switch 2 and 3. In Slide Switch 2, a press of the horn button activates
the Manual tone. In Slide Switch 3, each press of the horn button cycles through
a siren function, such as tones or air horn, assigned to horn-ring transfer via the
Convergence Configuration Software. In addition, the default configuration for
Slide Switch 3 is Siren Dependent Enabled, which restricts siren activation to the
slide switch position you select. For example, if you press a button that is assigned
a siren tone, the tone only activates when you place the slide switch in the position
that is Siren Dependent Enabled.
NOTE:
The horn ring circuit can be programmed as active high or active low as
described in “Setting Control Head Options” on page 42.
To enable horn-ring control of siren tones, obtain a SPST relay of enough contact-
current capacity to activate the vehicle horn:
1. Cut the wire that connects the switch for the vehicle horn ring to the horn or
horn relay. See Figure 13 on page 30.
2. Splice the white/yellow wire from the power cable to the horn ring side of the
wire that you cut in step 1.
DETERMINE CURRENT FOR HORN: The siren’s horn ring transfer circuit
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 9.
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 (active-low) voltage or switched ground
(active-high) for activation?
7. Connect the switched relay-contact terminal to the positive or negative
potential you determined in step 6.
8. Connect the white wire from the power cable to one end of the relay coil.
9. Connect the other end of the relay coil to the opposite potential of that
connected to the switched relay contact terminal in step 7.
10. Insulate the spliced leads with twist-on wire connectors. Fold and seal unused
leads.
