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  1. T

    Fuel Change Over Mark Vie GE Frame 9E

    How is fuel changeover (from Gas to Liquid) happening in Frame 9E Gas turbines (GE) under Mark Vie control system? I know that a signal from gas pressure switch should initiate fuel changeover from NG to liquid fuel, but how is the logic working and which signal exactly is considered as...
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    Voting mismatch, Mark IV+

    Dears Thanks for your response again But since I posted last time, the GT was not started again. Just I want to refer to one point. maybe it can give you some idea. During start up when this problem is happening, the red LED of the <T> controller HMPJ processor module is not glowing...
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    Voting mismatch, Mark IV+

    Dear CSA Thanks a lot for your response I have already all the diagnostic alarm drop numbers for <T> because it is appearing on the alarm list under the diagnostic alarm display. The point is, the order of alarms is not always the same, some time it is coming first for L4QA and some...
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    Adding new analog input to GE Mark IV.

    Dear CSA Thanks alot for your response.
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    Voting mismatch, Mark IV+

    Dear all, We have one problem in our control system Mark IV+ for GE frame 9 Gas turbines in DEWA- Dubai. I hope that somebody is having idea or can advise us. When turbine is in shutdown condition there was no alarm, but after giving start command the following alarms are appearing: *...
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    Adding new analog input to GE Mark IV.

    Hi everybody; I want to know the procedure of adding new analog input to the AIO module. We want to add new signal (4-20 ma) of level transmitter for monitoring purpose only. But it is not clear to me from Mark IV manual how to do the job. How to configure this input and range and which...
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    LVDT reading is not following Moog servo valve command

    We have Speedtronic Mark IV+ control system for controlling GE Frame 9 Gas turbine machine. When I was stroking the Liquid fuel bypass valve after shutdown, I found that valve position is not going as per forcing voltage. for example if I give (+5 vdc) the valve is going only to 45 % closing...
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    Provide redundant speed protection for gas turbine

    Hi every body, My question is related more to designers than maintenance staff. But I want to share this with every body, may be somebody can help depending on his field experience. We have GE gas turbines Frame 9E controlled by mark IV control system. The over-speed protection is provided...
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    CSRGV voting mis match alarm

    Dear CSA: thank u for your detailed reply, actually i have one problem. I am maintenance engineer and the reports which are coming to me from operation staff do not contains all these details you want to know. just they tell me there is one alarm like that. But they do no not tell at which load...
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    CSRGV voting mis match alarm

    Dear nanang thanks for your kind response. i agree with you that all the possibilities you mentioned can affect the value of CSRGV. but if it is affected by any one, the change will happen in the 3 controllers? why it is coming only in <R>? why miss-match is happening?
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    CSRGV voting mis match alarm

    Hi every body We have GE gas turbine frame 9 dual fuel controlled by Mark IV system. The following alarm is coming frequently during normal running since long time and without relation with any particular situation: <R> voting mismatch (CSRGV) Also some other alarms are coming but not...
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    voting in mark 4

    thank very much, actually Ur answer is rich and very nice. To be clear with u, i didn't understand 100% ( still beginner), but i feel that i can imagine some thing. Briefly i will say what i have got from your replies, and please correct to me if i am wrong. For critical signals (voted by 3...
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    voting in mark 4

    Hi Everyone I am working in a power plant where GE GTs are used, frame 9E , mark 4 DCS . I am trying to understand how the voting is done in mark 4 and I hope some one can answer my question. To explain my point , I am going to give an example: 3 pressure switches are used to measure...
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    gas control valve and speed/ratio valve

    dear CSA >>> thank you very much.... answer is very clear and useful.
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    gas control valve and speed/ratio valve

    always i read that speed ratio v/v control or maintain the gas pressure and control v/v controls the flow. Actually i don't know how to control flow without changing pressure. Or by other words, what is the difference between pressure regulation and flow regulation? In both cases we control how...
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    temperature switches and level switches

    thank u everybody.... but actually Roy 's answer was useful ... also other advices are nice. thanks a lot.
  17. T

    temperature switches and level switches

    I understand... but I mean, there is main idea for most temperature switches, like basic idea and all other types are just modifications of that idea. Anyway... thank you for your reply.
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    temperature switches and level switches

    There are many temperature and level switches in gas turbine. Please if any one can explain the scientific and theoretical idea of operation of these two switches. I mean how these switches work and what is the physical phenomena behind it. thanks a lot
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    L4 master protective?

    Thank you guys... answers are clear and sufficient.
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    L4 master protective?

    i want to understand the deep and detailed meaning of the master protective signal L4 in GE different control systems? i mean, what is the meaning of L4=1 or 0 , and what is the h/w or s/w behind its value. i know , this question may be so obvious , but forgive me guys... i still new in the...
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