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We are running Frame 6B machine controlled by Mark V TMR, with HRSG in combined cycle mode at part load. Recently faced problem when load was increased, IGV was on manual mode and to control exhaust temp / Super heated steam temp IGV was tried to open from 57 Deg but it stuck up at 59 Deg. It can go back to 57 but can't open more than 60 Deg. 2 drums of lube oil topped up. Hyd oil pressure remains @ 90 bar steady. No Hyd oil filter DP increased. Lube oil temp. was maintained @ 60 -64 dg C. Servo current keeps increasing when actual and set point value differs. 1 month back during annual shutdown it was opened during water wash.
What could be the problem?
What could be the problem?