Hydraulic Powered Electric Actuator for Engine Control
The PG-EG Actuator is used on diesel engines to replace PGA/PGG/PGE-type governors, providing the advantages of electronic control with the convenience of the existing PG-type drive and linkage. We recommend the PG-EG Actuator for installations involving unattended starts.
The actuator does not need a separate oil supply. The actuator operates with drive speeds from 200 to 1200 rpm. Applications with a high drive speed or high ambient temperatures may require an oil cooler.
The PG-EG Actuator converts a given electrical input signal into a proportional hydraulic output shaft position, to control engine fuel flow. The actuator provides the muscle for Woodward analog and digital controls.
The PG-EG Actuator is available with several servo options, giving a full range of work and torque output (see table on next page).
All current PG governor bases (designed to exactly fit any drive designed for a PGE locomotive governor, PGA or PGG governor) can be used with the PG-EG.
The proven PG pump and accumulator is reversible or may be set for one-way rotation (advised for generator applications).
The actuator uses standard PG output s hafts and power levers. The PG-EG actuator will adapt to most engines being built today and is available for retrofit to most existing engines, in many cases with out changes to linkage drive or other configurations. Maintenance procedures are similar to those needed with a PG governor.
The actuator's electric-to-hydraulic trans ducer uses a Woodward-built torque motor which converts the 0–200 mA control signal to a given output position. This actuator is available for use with ei ther direct- or reverse-acting electronic controls. Direct-acting actuators will cause a shutdown if the electrical current to the actuator is lost or interrupted. Direct- and reverse-acting units use the same hardware and can be re-calibrated from one into the other.
A 140 μ m wire-mesh filter is accessible from the outside of the PG-EG. The filter protects the small orifice in the pilot valve, which is an integral part of the electric actuator.