GE DS200DMCBG1AED DS215DMCBG1AZZ03A module

Setting Droop for an Isolated Load 

1. Open the OPEN FOR DROOP switch (or disconnect the wires from terminals 13 and 14). 

2. Start the engine and adjust the speed for rated with no load. 

3. Apply full load. 4. Adjust the DROOP potentiometer to give the desired speed. Example: Operating at 60 Hz, 57 Hz at full load indicates 5 percent droop. If only 50 percent loading is possible, 58.5 Hz would indicate 5 percent droop

Setting Droop for an Infinite Bus

 1. With the generator not paralleled, adjust the speed above rated frequency by the percent droop required (set engine at 63 Hz for 5 percent droop on a 60 Hz system). 2. Mark the speed setting potentiometer position or measure dc voltage on TB27(+) and TB26(–), and re-adjust the engine speed for rated frequency. 3. Turn the DROOP potentiometer fully clockwise for maximum droop. 4. Synchronize the generator with the bus and parallel it with the bus. 5. Increase the speed setting potentiometer to the position marked in step 2, increasing load. 6. Slowly adjust the DROOP potentiometer counterclockwise, decreasing droop, until 100 percent load is obtained. If it is necessary to set the droop without pulling 100 percent load, set the engine speed accordingly for the desired percent of droop at the load to be pulled. For example: Five percent droop at 50 percent load will require a no load rated speed of 61.5 Hz, not 63 Hz, on a 60 Hz system.

Theory of Operation

This chapter describes the operation of the Load Sharing Module and its internal circuits. Figure 1-4 is a block diagram of the circuits in the module. The Load Sharing Module senses the power output of a generator and provides a pulse-width modulated signal to the Caterpillar digital speed control to adjust the power output of the engine-generator set to match the reference power level. The Load Sharing Module can also produce a droop condition (instead of isochronous load-sharing) for the engine with Caterpillar digital speed control, making it possible to connect the generator set in parallel with either a generator set which is running isochronously, or with an infinite bus.

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