GOVERNOR ADJUSTMENTS

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Compensation range

This adjustment is effected by altering the position of the fulcrum on the lever connection between the servo out put linkage and the compensation transmitter piston.

Compensation rate

This adjustment is effected by setting the compensation needle valve once the range has been set. In practice the needle valve is opened out until the control just becomes unstable and then the valve is closed back in 1/4 of a turn.

In addition to setting the compensation rate at initial installation the needle valve is also used to assist cleaning of the governor when flushing through and also to  purge system of air in the event that air becomes entrained in the hydraulic circuit. Adjustment necessary if response is sluggish (possibly air in system), engine speed hunts or if engine over-speeds at start up.

Local speed setting (Synchonising control)

Primarily there in case remote system fails but can be used for fine tuning and for testing of overspeed.

Speed setting indicator (Synchonising indicator)

Essentially a counter to indicate the number of turns that have been made by the speed setting control. Usually has a minimum and maximum fuel setting limit facility incorporated.

Load limiting

Limits the working maximum fuel and so maximum load within the absolute maximum limit set for the governor. This facility is usually required following overhaul when a limit on the engine load is required during running in. Can also be used for local shutdown in some cases depending on the minimum load setting set above.

Speed droop

This setting is effected by altering the position of the droop lever fulcrum point. The setting is adjusted to give stable operation of the governor. Also needs to be used to select isochronous or droop operation when generator load sharing is required.