IC695CPU315 Gas turbine module

Point K Unit 3 reaches its unload trip point and opens its generator breaker. The system load is still below the Min Gen Load set point of 25%. The Master’s Max Stop Time delay has expired. The master begins timing for the next gen off delay time. Point L The system load remains below 25%, and the master issues a command to unit #2 (network priority #2) to off load. Point M Unit 2 ramps off load and opens its generator breaker. This leaves the master unit (network priority #1) on line supplying the load. When required the master will sequence units on and off line as shown above and determined by the sequencing set points in its Sequencing and Comms menu.

The Master unit in any multiple unit EGCP-2 system

 is always the unit with the lowest Network Priority setting. All slave units are then sequenced on line in ascending order of their Network Priority settings, and sequenced off line in descending order of their Network Priority Settings. The Master is always responsible for any automatic sequencing of the slave units on and off line.When the application consist of multiple units of different sizes, the sequencing of units offline changes. The Master cannot look only at the System Load level to determine when to sequence off a unit. The Master also knows the kW load the slave unit is carrying.

• If the Master unit sequenced off the 1000 kW generator, the 500 kW would be carrying 375 kW, System Load = 75% 

• The Master cannot sequence off Generator 2 until the System Load will be 50% or less after generator 2 is offline. 

• What is 50% load to Generator 1  System Load = 50% = 250 kW 

• So the total system load must be 250 kW or less before generator 2 can be sequenced off. This is a System Load of 16% or less with both generators operating.