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IF your control system is typical of most GE-provided systems, the only interruption you will experience is loss of communications between the HMI(s) and the Mark VIe due to loss of power to the network switches. Not a small interruption, unfortunately, but as long as the process is...

MS5001fan, I don't understand this statement: > - The unit has always operated with a 100F increase in firing temperature. > This is supported by an average GT exhaust temperature of 1000F while the > GT nameplate is 900F. I don't know the correlation between exhaust temperature...

Dave, Wow! So many questions.... You are generally correct, but when looking at GE CIMPLICITY displays for GE-design turbines one can NEVER ass-u-me anything. That's because the standard at GE is: There is no standard. Everyone who can edit a CIMPLICITY display is free to use whatever...

CcpEng, Consult the Control Specification document provided with the Speedtronic gas turbine control system; specifically Section 03. It will give you as much information as you might need. Also, this topic has been covered <b>MANY</b> times before on control.com. There is a 'Search' field...

1) You would have to ask the manufacturer or consult the documentation regarding the efficiency of any prime mover, regardless of size or rating. 2) P.U. means "Per Unit". For example, of the rating of the prime mover was 30 KW, then 0.5 p.u. would be 50%, or one half of rated, or 15 KW...

Thomas, Some turbine compartments are under a positive pressure by the turbine compartment vent fans, and some are under a negative pressure (few mm of water vacuum). Ventilation problems can be the result of many things, including leaks of axial compressor discharge air from casing joints...

Logiclover, Personally, I don't like to ass-u-me anything if I can avoid it, and I recommend others do the same whenever possible. There is a move to eliminate combustion turbine flame detectors and just use a sudden change in axial compressor discharge pressure along with a sudden change...

Abdur Rehman, Running with compartment doors open means if a real fire is detected and extinguishing agent is discharged, the extinguishing agent will not be effective because it will not remain in the compartment. Also, air will be allowed to enter the compartment through the open doors...

Reg reference = regulator reference Reg feedback = regulator feedback Regulator is another (GE) term for servo-valve output. The reg reference and -feedback numbers don't make sense to me, but then we don't know what the null bias currents are set to which might be the reason for the...

Kwaku, This question is not directed simply at you: Why do people ask why their turbine trips >>WITHOUT<< providing a chronological list of Process Alarms when the turbine trips? Seriously. If one doesn't use the alarm list to troubleshoot a problem--especially a turbine trip--then one...

Kwaku, YOU asked about a viewer with ControlST. You haven't provide a lot of details about the exact type of Speedtronic and HMI you are working on.... Previous versions of CIMPLICITY used a special AMV object to display alarms. Newer versions of CIMPLICITY don't; they use the AlarmST...

Kam, Try this link: http://www.dac-3d.com/Knucklebuster/PDFFiles/E410-S02.pdf (remove any spaces inserted by the forum software) It's been a very long time since I've had to calculate motor performance to such a fine degree, but I believe there are standards which most motor...

Kwaku, Greetings! 1) Yes. GE HMIs do not participate in or perform any critical control and protection functions; that's all done by the Speedtronic turbine control panel independently of the HMI. Think of the HMI as a "window" into what's going on in the turbine control panel, and, of...

Sunil, The Mark V Maintenance Manual, GEH-5980, shows how the IONETs of <R>, <S> and <T> are connected. The IONET runs from the DCC/SDCC, to the TCQC, to the associated TCEA, then to the associated TCDA, and if there's a <QD2> to the associated TCDA in <QD2>. You are taking a huge risk...

Shimy, Hopefully, others who read these posts who have 9FAs with liquid fuel will tell us about the configurations at their site(s)! The best way to know for certain is to review the P&IDs, the Control Specification document, and the sequencing or application code running in the...

Divyang Shah, The designers of the Mark V "decided" not to show the origination of many signals used in logic that are "written to" by operating system software. L3COMM is one of those signals; it is written to by operating system software running in each of the Mark V processors. There...

Steve Myres, Thanks for the link. I'm not accustomed to motors being lightly loaded.... The site explains it very well; reactive load is constant, and therefore power factor will vary with real load! Thanks again; makes perfect sense.

Ayman Elsebaii, I've been following this thread with interest. And this comment has me very curious: > I think with that severity there must have > been dozens of alarms at Mark V log. This being a two-shaft machine, the high vibration seems to have been experienced only on the HP...

Kam, One more thing. For most AC motors, when operating at or near rated power they are very efficient at converting electrical power (watts) to mechanical power (torque; horsepower; etc.)--on the order of 95+%, if not higher. Again, that's when at or near rated current/voltage (which should...

Divyang Shah, TILs are issued by GE. If the turbine/control system was purchased from GE, they will usually mail (post) them to the site. If the turbine/control system was purchased from a licensee of GE (BHEL, for example) the licensee would usually forward a copy (usually by post) to the...