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NIGHT SCAN VERTICAL, VERTICAL COMPLETE, AND VERTICAL HDT
OPERATING INSTRUCTIONS
TP-4836201-H
MAY 2021
5.10.5
Wiring Vehicle Safety Interconnect Circuit
The mast provides an isolated relay contact output to enhance integration into vehicle safety
circuitry. 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 National Fire Protection
Association (NFPA) 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 5-27 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.
Figure 5-27 Example Vehicle Safety Interconnect Circuit
The contact output is set at the factory to be OPEN when the mast is active (not stowed) by
setting the S2-1 Dual In-Line Package (DIP) Switch to the OFF (OPEN) position. To change the
contact output to be CLOSED when the mast is active, set the S2-1 DIP Switch to the ON
(CLOSED) position. Mast power needs to be cycled for this change to take effect.
5.10.6
Wiring Optional Enable Circuit
Some safety standards require preventing operation of the mast unless other conditions are first
met. An example might be having the parking brake set. This can be accomplished by inserting
an isolated contact in series with the stop circuit of the "E-Stop" button. Inserting these contacts
in line with the wire connected to pin J4-7 on the base circuit board breaks continuity, which
inhibits operation of the mast and prevents operation until the parking brake is set. After use and
properly stowing the mast, when the parking brake is released, the mast is again prohibited from
energizing until the parking brake is set.
Note: Using this parking brake feature is the same as pushing the E-stop button. Power to the
control is opened, the mast immediately exhausts air, and the mast comes down without regard
to the proper RCP alignment (stowing to the home position). The parking brake should not be
released until the mast is safely (and automatically) stowed by the controls.
Summary of Contents for Night Scan Vertical 4.3-15
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