Model SBF90
Eight Lamp School Bus
Electronic Flasher
Introduction
The Model SBF90 flasher/controller is a completely electronic microprocessor
based device dedicated to the school bus warning light application. It is com-
prised of a logic controller and a unique and highly efficient power switching
circuit. The SBF90 operates the stop arm solenoid and eight 80 watt warning
lamps. Inputs from the Start Switch and Passenger Door Switch activate the
flasher/controller. Master Switch and Override Switch provisions are also
included. Capabilities for both Sequential and Non-Sequential operation are
provided.
The Model SBF90 flasher’s circuitry is sealed to protect against severe
environments and its internal construction is designed to withstand shock and
vibration typically found in school bus applications. Wiring connections to the unit
are via industry standard 0.25 inch Faston terminals.
Installation
The SBF90 should be located in a dry area such as the electrical compartment of
the school bus. It should be accessible to the lamp wiring, 12 volt power, and
ground. Mount the flasher on a clean, smooth metal surface to ensure the most
effective heat transfer (the mounting plate removes heat from the flasher).
Before wiring the flasher/controller, disconnect the 12 volt power from the
chassis by removing the battery connection.
Wire the flasher/controller to the required lights, ground, power and other devices
as shown in the Wiring Diagrams and Technical Description sections. Ensure that
the power wiring to the flasher/controller is fused. The fuse and wire size must be
of sufficient size to protect the wiring and prevent from false tripping due to the
lamp loads and high inrush currents. It is very important to provide a good ground
to the unit. The wiring harness connecting to the flasher should be properly
secured to prevent damage from vibration and stress on the connections.
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