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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 is compatible with all Woodward 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.
Product Specification 36638