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> Woodward 721 speed digital control
Woodward 721 speed digital control
The 721 Digital Speed Control is a powerful,
configurable load sharing and speed control with a
torsional filter. The 721 control governs gas or
diesel reciprocating engines driving generators
through flexible couplings. Using inputs from both
the engine and generator sides of the coupling, the
721 control filters out torsionals in the speed
signals. As a result, transient performance is
improved without sacrificing steady-state stability.
The 721 Digital Control can share load between
multiple engines driving a common mechanical or
electrical load. It offers automatic bumpless
transfer of load between engines and adjustable
load and unload ramp rates. The control also
provides a limiter to prevent engine overfueling or
The 721 Digital Control uses a 16-bit
microprocessor, providing control dynamics that
give smooth steady-state operation and fast
response to speed and load changes. The 721
Digital Control dynamics are varied automatically
as functions of both speed and load to provide
better performance over the operating range of the
engine. Two separate sets of dynamic adjustments
are externally selectable, for circumstances where
The Woodward Hand Held Programmer makes all
adjustments quickly and easily through the
control s ten convenient menus (a standard
ASCII character computer terminal with an RS-
422 serial port may also be used). The control
saves all set points in permanent memory
