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Since Pre-Selected Load Control uses feedback from a load (MW) transducer, it's possible the load transducer, or one of its inputs (potential transformer; current transformer) is failing or having a problem. It would require a shutdown and a person or persons with some sophisticated test...

MartinFO, Hmmm.... I'm not sure I really understand the set-up or the need to control the speed. And I'm really not familiar with trying to measure speed with a reed switch and magnets. But I think you need more pulses in a shorter period of time than you are getting, especially if you want...

luiss, To Continue (due to the 10000 character limit imposed by control.com)... You say the SRV is fluctuating. What is the GCV doing when the SRV is fluctuating? Is it also moving? Do you always used Pre-Selected Load Control to operate the turbine to maintain a particular load? There is a...

luiss, I'm going to presume the turbine-generator is older and previously had a earlier Mark* turbine control system and was upgraded to a Mark VIe. I interpret your statement about "... operating with a reduced load of 4 MW for a long period of time (more then one year). ..." to mean the unit...

dax2172, I know the operators and their supervisors and the instrument department personnel will ALL cringe and be shocked at the suggestion of running the unit without Pre-Selected Load Control active because they are just all CERTAIN that the unit will drift to any load and be "out of...

dax2172, Can you please provide better data on both the TNR and TNH variations? What happens when you click on RAISE SPD/LOAD or LOWER SPD/LOAD (which disables Pre-Selected Load Control but would not results in excessive load swings!)? Disabling Pre-Selected Load Control should result in a...

gtengineer, If there is humidity condensing on the Reuter-Stokes Flame Trakker lenses, the problem is most likely that the cooling water flow to the sensors is not being properly regulated. There are supposed to be needle valves in the cooling water discharge tubing which are to be adjusted to...

farhan317, The ability to "private message" people on this forum is a mixed blessing. The really GREAT thing about these kinds of forums is that MANY people can benefit from the questions and answers of one person over many years. It's a very unselfish thing to participate in these open...

farhan317, Usually, there is one (1) starting means for a gas turbine. (A starting means can be an asychronous (induction) motor, an expander turbine, a diesel engine, a hydraulic starter, a pneumatic starter, even a synchronous motor (one temporarily converted from a synchronous generator for...

Sounds like a school science project. Because you haven't stated what the power of the gas turbine asynchronous starting motor (also normally called an induction motor by people in the industry, and an asynchronous motor by people in school) requires. You need to know that, and you need to...

farhan317, Thank you for reading previous threads. You are replying to a post that is almost six (6) years old. If your question is related to this thread ('Gas turbine starting system') please--just ask your question. If it's not related to this thread, you should open a new thread (post)...

anees, I know most people dislike (loathe) Diagnostic Alarms, but they can be and are helpful and important when troubleshooting. It is impossible for me to troubleshoot this via this forum. I would need to be on site and watching each and every step and the results of each and every step...

anees, I'm sure you have the Mark VIe System Guide manuals (Vol. I, -II, and sometimes -III). They have compatibility charts for all of the I/O Packs and I/O terminal boards and such. There have been MANY revisions to the manuals over the years, and so you need to try to use an appropriate...

anees, Diagnostic Alarms are usually very helpful and instructive in situations like this. Believe it or not.

anees, A UCSA is an older Mark VIe controller, so I presume the Mark VIe TMR system at your site is also several years (maybe more) old. Further, if this Mark VIe is being used to actually control a turbine, can the turbine be started and operated given the issues you are describing? Also, it...

WalterCTPL2019, As was said earlier, it's NOT possible modify rungs (sub-rungs, to be exact) and rung elements in a sequencing BBL (or ANY BBL for that matter)--because they are hard-coded into PROM. The Mark V displays rungs and information in RLD format (Relay Ladder Diagram format). I don't...

luiss, When did this problem start? After a trip from load? After a maintenance outage? ??? After someone "calibrated" the SRV LVDT(s)? What process alarms are present for loads below 6 MW? Which terminal board and associated I/O Pack is (are) the P2 pressure transducer(s) connected to? Have...

jakky, I want to also add that it could be a mechanical issue with the actuator of the control valve with a problem--leaky seals; worn cylinder; etc. Particularly if the Mark VIe is an upgrade to an older control system on an older unit. I have even seen low quality actuators used on new units...

jakky, I wish I could say with a high degree of certainty (as I'm sure you would like to hear, also!): Do this and your problem will go away. But, I don't have any (as in zero) experience with Rexroth servos. I have no idea if they are unipolar or bipolar or anything about them. You haven't...