HE693RTD600 Gas turbine module

Next Genset Delay—Only on the Master controls Sequence Status screen, to the right of this item, you can see the delay time being counted down from 30. It will keep repeating this countdown and continue starting units until the system load level goes below the Max Gen Load set point. Point C Ten seconds after receiving its start command, network priority #2 unit closes onto the bus and ramps into load sharing with the master. Point D System load levels drop to approximately 45% after unit #2 is finished ramping into load sharing. Point E A very large step load on the bus loads both generators in excess of 100% of their rated load. The system load reflects these levels. The master unit begins timing to the Rated Load Delay (5 seconds) before starting the third unit.

The third unit closes 

its breaker to the two units already on the isolated bus. Since the rated load delay is in effect, and the system load is above 100% of the generating capacity on line, the third unit immediately goes to load sharing, without any load ramping. System load drops immediately to approximately 55% when the third unit closes its breaker to the bus. Point G A step load decrease on the bus brings the system load down to approximately 35%. All three generators remain on line in isochronous load sharing. Point H A further step load decrease on the isolated bus brings the system load below the Min Gen Load set point of 25% to approximately 10%. The master begins timing for the Reduced Gen Dly time of 30 seconds.

Reduced Load Dly

—Only on the Master controls Sequence Status screen, to the right of this item, you can see the delay time being counted down from 30. It will keep repeating this countdown and continue to stop units until the system load level increases above the Min Gen Load set point or until all units have been sequenced off. Point J Since the system load is still below 25%, and the master’s Reduced Gen Dly timer has expired. The master unit issues a command to Unit 3 (network priority 3) to off load and opens its gen breaker. Unit 3 begins to ramp off load. System load begins increasing. The master begins its Max Stop Time delay of 15 seconds before checking to see system load is low enough to allow sequencing of another unit off line.