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Hello,
One of the GTG was shut down for CI. while coming down speed stayed at 90% (3240 RPM) for 5 to 7 minutes and GTG trip. Looked into the Mark VIe trip log. Following are the finding:
L94X1=1 during normal shut down. Breaker opened at 0.5 MW (ok). FSR was 11 and at about this time L4=0 and FSR was ramped down to minimum. P2 pressure was 241 and ramped to 260 or so. Trend shows L4=0, L94X1=1, FSR=minimum. SRV position negative GCV position negative. During entire time FSR=0. Fuel flow was 2.3, P2 was 260, GCV/ SRV negative but speed 3240 RPM. After sometime GTG tripped.
Questions: when normal shut down at what time L4 drops out? Check all constants and found to be right. I might have aggregated time but GTG was at 3240 for may be 1 or 2 minutes or there was no smooth ramping down on speed. IT is Frame 7EA and marl Vie control.
I appreciate valuable info especially from CSA.
Thanks
One of the GTG was shut down for CI. while coming down speed stayed at 90% (3240 RPM) for 5 to 7 minutes and GTG trip. Looked into the Mark VIe trip log. Following are the finding:
L94X1=1 during normal shut down. Breaker opened at 0.5 MW (ok). FSR was 11 and at about this time L4=0 and FSR was ramped down to minimum. P2 pressure was 241 and ramped to 260 or so. Trend shows L4=0, L94X1=1, FSR=minimum. SRV position negative GCV position negative. During entire time FSR=0. Fuel flow was 2.3, P2 was 260, GCV/ SRV negative but speed 3240 RPM. After sometime GTG tripped.
Questions: when normal shut down at what time L4 drops out? Check all constants and found to be right. I might have aggregated time but GTG was at 3240 for may be 1 or 2 minutes or there was no smooth ramping down on speed. IT is Frame 7EA and marl Vie control.
I appreciate valuable info especially from CSA.
Thanks