"Our power plant is a facility that has been operational for nearly 20 years. The gas turbine is a GE-produced PG9171E model, and the control system in place is the Mark V system. I have recently taken over the maintenance of this plant as the previous maintenance personnel have left. We are planning to perform a shutdown and water wash after some time. During the unit shutdown, it will be necessary to manually fully open the IGV (Inlet Guide Vane) to facilitate mechanical work. Could you please advise on the procedure for fully opening the IGV during unit shutdown?
Based on my understanding, I believe that initially, the lubricating oil pump and hydraulic oil pump should be started. Are there any other tasks required at this point? In the previous maintenance records, it was mentioned that four signals need to be forced in the Mark V control logic, and then manual operation is needed on the servo valve LVDT auto-calibration screen. However, the specific details about which four signals need to be forced were not provided in the maintenance records. Does anyone know which four signals need to be forced?
After analyzing the control logic, I think there are several signals that might need to be forced:
1、 Trip master signal;
2、 20TV solenoid valve command;
3、20FG solenoid valve command;
4、IGV output command CSRGVOUT.
I am unsure if my analysis is correct and would greatly appreciate assistance from the community. Thank you.
Based on my understanding, I believe that initially, the lubricating oil pump and hydraulic oil pump should be started. Are there any other tasks required at this point? In the previous maintenance records, it was mentioned that four signals need to be forced in the Mark V control logic, and then manual operation is needed on the servo valve LVDT auto-calibration screen. However, the specific details about which four signals need to be forced were not provided in the maintenance records. Does anyone know which four signals need to be forced?
After analyzing the control logic, I think there are several signals that might need to be forced:
1、 Trip master signal;
2、 20TV solenoid valve command;
3、20FG solenoid valve command;
4、IGV output command CSRGVOUT.
I am unsure if my analysis is correct and would greatly appreciate assistance from the community. Thank you.