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  1. C

    6B Turbine, mkIV controls; High exhaust temps causing FSRT to hold turbine at <50% during startup.

    First image was the good startup. The second is the bad startup.
  2. C

    6B Turbine, mkIV controls; High exhaust temps causing FSRT to hold turbine at <50% during startup.

    What would cause FSRT to limit FSR during a startup resulting in turbine speed leveling out at just less than 50%. I know that exhaust temp is the immediate answer. On two startups separated by only a few hours: the first one went normal temps rising but leveling out at about 900 before starting...
  3. C

    GE Mark 4 Frame 6B Vibration Transducer Troubleshooting

    The trend is from the DCS (MAUI>>HMI>modbus>DCS) I know the HMI has a lot of 4 times per sec. and I think these are on that list, but I think the DCS has them closer to 1 time per second. We don't have as much history on the HMI, which is why the trends are from the DCS. I'll update this when I...
  4. C

    GE Mark 4 Frame 6B Vibration Transducer Troubleshooting

    After reconnecting after a major inspection, I saw one sensor acting a little different than the others when still shutdown. All of the others were about 0.25 in/sec which is what I’m used to seeing. BB2 (Bearing #1, 39V-1B) was reading about 0.5, but after startup it dropped down to about 0.1...
  5. C

    GE Mark 4 Frame 6B Vibration Transducer Troubleshooting

    We have (39V) vibration transducers that send 150mV/in/sec@80hz. We've been having problems lately so I contacted the manufacturer of these 4-131-0103 sensors and found out that they recommend annual calibration testing of the sensors, which they can do. The problems I'm seeing are biased and...
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