R
We are facing typical problem with regards to IGV control. About a month back GT ( Frame VI) Tripped on IGV Control Trouble trip. It was observed that IGV was opening smooth at 57 degree at part load. All of sudden it started hunting and within few seconds machine tripped. We cleaned the pensil filter for moog valve and started the m/c again. M/c continue to run for one month and last week the m/c tripped again on the same pattern.
We changed the filter and checked the IGV opening. IGV opening 2 degree less than the set point. It was thought that the null bias of moog valve got disturbed and started the m/c. But now the difference varies between 1 degree to 5 degree. Like m/c continue to run with 1 degree diff and all of sudden diff increases to 4 degree then the m/c continue to run with this difference for a day or two then again the difference reduces to 1 degree. Can anyone suggest the probable cause and remedy of this problem.
We changed the filter and checked the IGV opening. IGV opening 2 degree less than the set point. It was thought that the null bias of moog valve got disturbed and started the m/c. But now the difference varies between 1 degree to 5 degree. Like m/c continue to run with 1 degree diff and all of sudden diff increases to 4 degree then the m/c continue to run with this difference for a day or two then again the difference reduces to 1 degree. Can anyone suggest the probable cause and remedy of this problem.