Beechcraft 20138 - The Overvoltageprotection Circuit

3-4
THE OVERVOLTAGEPROTECTION CIRCUIT
This circuit performs the
functions
of monitor and
also
circuit
breaker in
the
event of an
overvoltage
condition.
The overvoltage tripout
point is set at
the factory
to 32.0
volts
±1.0
volt. However,
the user can
adjust this point within
the range of 30.5 to 33.5 volts.
(See caution
notice in
Section
4).
Once
the
tripout point
is
reached,
the
circuit energizes a relay
which
disconnects the
aircraft buss from
the
regulator circuit (Paragraph
3-3).
The circuit
automatically
locks itself out until it is reset by
interrupting
the supply. Figure
3-6
shows
a simplified
schematic
of the overvoltage
protection
unit.
3-11