for marine applications
The Woodward PGA-EG Governor / Actuator is designed specifically for marine applications |
requiring electronic engine control with mechanical backup. The governor/actuator combines
the proven dependability of the hydro-mechanical PG governor with the flexibility of
an electronic control.
The mechanical governor features pneumatic tracking of the speed setting, which gives complete |
backup speed control from a remote location, with only a slight change in engine speed should
the electronic signal fail.
The PGA-EG can be used with a variety of Woodward electronic controls. The backup |
hydro-mechanical governor gives it redundant speed control for critical marine needs.
Outputs from 16 to 678 N?m ( 12 to 500 lb-ft) allow use on all sizes of marine engines.|
The actuator portion of the PGA-EG requires a 0-200 mA control signal. This electronic controls.|
Backup speed control is accomplished by the simultaneous operation of hydro-mechanical (PGA) |
and electronic (EG) governing systems. To achieve backup control, the electronic system must
be reverse-acting (an increase in fuel is called for by a reduction in current to the actuator
portion of the PGA-EG ).
Setting the speed of the mechanical governor slightly higher than that of the electronic governing
system causes the mechanical portion of the PGA-EG to always seek a fuel setting higher than
that being controlled by the electrical part of the PGA-EG. Electrical control thus controls
the fuel position because of the least-fuel-selection feature.
Should the electronic signal to the PGA-EG drop to 0, due to some problem in the system,
the electric actuator will call for an increased fuel position above the setting of the mechanical
governor. At this point, the mechanical speed setting is lower and the ballhead controls
the engine-fuel setting.
Although the speed will be slightly higher under mechanical control, no gross overspeed or
shutdown occurs due to a loss in signal from the electronic control.
Direct-acting PGA-EG controls are available. These units will go to minimum fuel on loss of
electronic control signal.
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