Wiring Vehicle Safety Interconnect Circuit - Will Burt Night Scan Chief Series Operating Instructions Manual

NIGHT SCAN CHIEF
OPERATING INSTRUCTIONS
For Condition #2 (12 VDC with >20 Amps per circuit) a solenoid valve is added to the system to
manage the higher current load. This solenoid valve assembly includes a separate terminal block
to land the 12 VDC light power. Connect the left and right light power to the terminal block as
shown in Figure 5-7 following the polarity listed on the terminal block label. Note this only applies
to 12 VDC high current applications. The solenoid valve is not installed for systems under Condi-
tion #1.
Solenoid Valve
Terminal Block
Base Board
Ground Bar
Figure 5-7 Solenoid Valve Light Power Connection Point (for 12VDC High Current)
5.6.4

Wiring Vehicle Safety Interconnect Circuit

The mast provides an isolated relay contact output to enhance integration into vehicle safety cir-
cuitry. This output indicates whether or not the mast is stowed to indicate it is safe to move the
vehicle. The use of this vehicle safety interconnect is required for vehicle NFPA (National Fire
Protection Association) regulation compliance. The Will-Burt Company does not recommend
installing the mast on a vehicle without connecting to the vehicle safety interconnect circuit to
warn the driver or prevent the driver from moving the vehicle with the mast extended.
This relay output is from a bi-stable (latching) relay whose contacts either open or close (switch
selectable) when the mast is active (not stowed). Its state is not affected by whether or not there
is power to the mast. This contact is capable of carrying up to two (2) amperes and is available
on pins J4-8 and 9 (data cable supplied by the installer). Figure 5-8 shows an example vehicle
safety interconnect circuit. It can be used in conjunction with a customer-supplied relay to drive a
flashing warning light. Other arrangements are possible.
PAGE 30 OF 80 TP-4602001-T
DECEMBER 2020