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In our gas turbine (GE LM 6000 with netcon 5000 control), while running condition VBV A & B position showing a difference of 8-10 %. We stroked/calibrated VBV with high speed crank and it shown a position f/b difference of 1-2% only. But with the startup it went to the previous condition.
We checked on engine and off engine cables for recommended resistance and found it is matching. After that we have replaced both VBV actuators with feedback and on-engine cable of actuator which is showing higher value. Still no result and f/b is showing the same difference of 8-10%.
Have any idea what to check next?
We checked on engine and off engine cables for recommended resistance and found it is matching. After that we have replaced both VBV actuators with feedback and on-engine cable of actuator which is showing higher value. Still no result and f/b is showing the same difference of 8-10%.
Have any idea what to check next?