Droop Adjustment
This adjustment is only necessary for droop operation. The DROOP control sets the amount of speed regulation for the engine. The droop adjustment is only required when paralleling with utility bus or other units which are using hydromechanical governors. Since speed regulation is a function of load or power delivered, the DROOP function makes a reduction to the engine speed setting with an increase in load. The percent of speed droop is the difference between engine speed at "No Load" and engine speed at "Full Load". The percent of speed droop is expressed as a percentage of full load speed. It is calculated as follows.
(No Load Speed - Full Load Speed) (61.8 Hz - 60 Hz) Normally, the percent of droop is known. The correction that is needed is the amount to increase the "No Load" setting. In this case, the "No Load" setting is calculated as follows. (100 percent + Percent of Droop) Note: If only 50 percent loading is possible, a "No Load" setting of 60.9 Hz would be an indication of three percent droop as shown in the Illustration 1.
Droop AdjustmentExample
Illustration 1 g00617347
Setting Droop On System Operating Into A Commercial Bus
Setting Droop For An Isolated Load