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WillyBlackson, It's presumed you are having difficulty understanding and interpreting circuit diagrams drawn using relay ladder diagram description.?.?.? NO (Normally Open) and NC (Normally Closed) contacts in series and/or parallel configuration? This is very difficult for many...

Jerry, When did this problem start? Was a download to the Mark VI done just before this started occurring? If so, what was the nature of the download--why was a download performed? Was it because of a Control Constant change which was being made permanent? Or because of some other issue which...

WillyBlackson, If you're working on GE-design heavy duty gas turbines, the 'Heating & Ventilating Flow Diagram'--one of the group of Schematic Piping Diagrams, or P&IDs (Piping & Instrumentation Diagrams)--will show whether fans are used to pressurize or evacuate compartments with very simple...

glenmorangie/natgasman, What's the status of this problem, please?

Dear sir, Are you not familiar with Data List 15. 'Analog Control'? This is the usual way people stroke hydraulically-operated devices, and calibrate LVDT feedback. If you're referring to some other function in the Mark VI, you'll need to be more specific.

DIGICON is a third-party digital turbine control system, so the philosophies used may not be the same as those used by GE--specifically, that any condition which results in a turbine trip MUST have a Process Alarm to alert the operator to the condition which tripped the turbine. Personally...

niazbibiyana, The answer to your first question is likely contained in the alarm text message: The hazardous gas detection system sensors are not rated for the extra flow created when both vent fans are running. The answer to your second question is likely that the persons responsible for...

SMS, If flame is lost in one or more combustors then power output of the unit will be lower than when flame was present in those combustors. As such, the Mark VIe will try to increase fuel to maintain load--especially if the operators are using Pre-Selected Load Control. So, that's probably...

Jjss, Kindly, they are all there in the I/O Configurator. Kindly remember--the TCQA I/O configuration is downloaded to <R>, <S>, & <T>. The first 15 T/Cs terminated on the TBQA on <R> are ribbon-cabled to <R>; the second 15 T/Cs are ribbon-cabled to <S>; and the last 15 T/Cs are...

ahdash, Please--my watch stopped working one minute after I put it on my wrist. I just collected it from the watch repairman. What could be the problem? Oh, by the way, it's a Meier brand. And, when I put it back on my wrist it started working again and hasn't stopped since...

dontknowman, The subject of wheelspace thermocouples has been covered many times before on control.com, and past threads can be viewed using the 'Search' feature of control.com. GE defines firing temperature as the temperature of the hot gases entering or exiting the first stage turbine...

Turboget, The IGVs are used for very different purposes on the two types of machines--those with conventional combustors and those with DLN combustors. It's incorrect to assume GE is not correctly controlling the two types of GE-design Frame 9E heavy duty gas turbines simply because the IGVs...

Turboget, The sloped portion of the exhaust temperature control "curve" represents constant firing temperature. So, when the unit is operating at Base Load (on the curve with the IGVs at maximum operating angle) firing temperature is constant. For a GE-design Frame 9E heavy duty gas turbine...

Turboget, There have been many posts about exhaust temperature control on control.com. There is a cleverly-hidden 'Search' field at the far right of the Menu bar of every control.com webpage. (It's recommended to use the Help function to learn the syntax of search entries.) TTRXB is...

cbcdiligence, Yes; it's somewhat related to the mechanical characteristics of the prime mover and associated equipment. Most steam turbines can't be loaded as quickly as many gas turbines (well, actually, the steam turbines can be loaded quickly but in some cases steam production from the...

aisyah, For GE-design heavy duty gas turbine-generators, a cold end drive/generator is one that is coupled to the axial compressor inlet end of the unit (the colder of the two ends of the turbine). A hot end drive/generator is one that is coupled to the exhaust end of the unit (the hotter of...

suryapower, You are still assuming that all instrumentation and configurations and internal clearances are identical. <b>If</b> all things were equal, it would certainly seem there is something amiss. Until you have hard data on which to base your analyses--which means a systematic and...

cbcdiligence, On an AC (Alternating Current) power system of any size--the frequency of the system is related to the speeds of the generators (and their prime movers). And when synchronous generators are synchronized together on an AC power system of any size no single (nor multiple)...

rebmehda, We've been suggesting to look at a possible gas fuel flow restriction somewhere upstream of the SRV/GCV but we haven't heard anything back about any checks that have been done. In my experience, if there is a flow restriction it shows up primarily as a very high opening of the...

Kohsa, Have you RTFM (Read The Fine Manual)? It's difficult to believe the proper values would not be specified in the manufacturer's manual, or at least the procedure for determining/setting the proper flow-rates. Having written that, I do realize that some vendors use components from...