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RY, Thanks very much for the feedback. However, There is normally a mechanical stop on the ring gear that prevents travel at the open end beyond approximately 89 degrees. And, most of the IGV actuators I've seen also have a mechanical stop that prevents the actuator from traveling too far...

This simply amazes most people--because they assume that the Great and Vaunted Speedtronic adjusts fuel flow-rate and air flow-rate to maintain a desired air/fuel mixture at all operating conditions. Most new automobiles and trucks do this today (check combustion stoichiometry)--and they don't...

During start-up the IGVs should start opening at approximately 80% speed. The reference is (or should be) CSRGVPS which uses temperature-corrected speed (TNHCOR)--which is derived from the axial compressor inlet thermocouples (which is CTIM). What Process- and Diagnostic Alarms are present...

Marco Polo, This information isn't in the Control Specification (which, among other things, contains the factory values of Control Constants).

Marcin, We're happy you're getting a lot of good information from control.com. However, the information you're asking for can be considered by GE to be proprietary information about axial compressor design, which GE wants to protect as intellectual property. In all the years I worked...

MIKEVI, Thanks very much for the information. Your practice of 'Validate'ing a file before making any changes to make sure Toolbox has no issue(s) with the file is a good idea. And, 'Validate'ing again after making the changes before 'Build'ing is also a good idea. (Actually, I think some...

MIKEVI, Quick question: Why is it necessary to 'Validate' the .hmb file and then 'Put to the Database' from the .hmb file, and then 'Get from the Database' from the .hmb file? Nothing has changed in the .hmb file--only in the .m6b file. It's always seemed to me to be an unnecessary step--and...

Neo, 1) Yes; there are ways to trip the turbine via the Control Oil or Trip Oil system. Units with a mechanical overspeed bolt will trip via the Control- or Trip Oil systems, and some units have a manual "Trip" button or lever in the Accessory Compartment that will also trip the turbine via...

Rokan Uddin, GE TAs typically have extremely little experience operating GE-design heavy duty gas turbines, and they usually cite what the "Company line" is with respect to issues such as this. The idea behind putting the unit on turning gear for some time before starting it if the unit...

Fadhel, The alarm 'ALARM XMIT SUSPENDED. CPU SWITCHED' has been covered in previous threads on control.com. Use the search term: +"ALARM XMIT" (exactly as typed) and you will find several threads with some explanations. My best guess: A very serious DC power supply issue (ground...

VINNY, > Why IRP panel is used between DCS and MCC? I presume by "IRP panel" you are referring 'Interposing Relay Panel panel.' Most of the time when interposing relays are used between discrete outputs of a DCS (or PAC--Programmable Automation Controller, or PLC--Programmable Logic...

d, > The electricians only wire what is on the drawing and more than a few engineers have made grounding mistakes. I will wholeheartedly agree with the second of the two statements--but not with the first. There are few drawings used in industrial projects these days, and in my experience...

Hi, Dave, First of all, let me say I've been lax in reading other non-turbine control system-related posts on control.com and completely missed the 'Lessons on Industrial Instrumentation' link. WOW! That's quite a work, and considering the author started a similar project (tome) on...

Srbg, What you are describing is entirely possible--and would be correct as long as the shield is grounded (earthed) at one end only. The problem is that most electricians are not knowledgeable in proper grounding practices, and tend to ground shields at BOTH ends (usually because there...

rwailikhalid, FPRG is a control signal database signal name for P2 Pressure Reference (Fuel Pressure Reference-Gas). You can add it to any User Defined or Demand Display, or you can display it on a Logic Forcing Display (it's not forceable, but it can be viewed on the Logic Forcing...

Neo, I'll try to answer your questions, but I'm not clear on at least one of them. Yes; you are basically correct that there are four basic ways to trip the turbine <b><i>via the Speedtronic turbine control system:</b></i> 1) Application code (high-high vibration; loss of flame; exhaust...

CuriousOne, If I only had a nickel for every time I have heard that refrain I would be a very, very wealthy young man. Yes; the file(s) in question (which you didn't name) is(are) most likely ASCII text and so can be easily edited. <b>However,</b> what to put in the file, and where, and...

It's not really clear what mohanad is asking. It could be that he wants to establish an entirely new MODBUS link between the Mark V and the Emerson control system, in which case, that would require a long and detailed explanation--but could be gleaned from reading the manuals provided with the...

Okay, Neo, It's important to note that the fuel stop solenoids of GE-design heavy duty gas turbines with Mark VI turbine control systems are connected "between" the TRPG and TREG cards. That is, one side of the fuel stop solenoid is connected to a TRPG card, and the other side of the solenoid...

G.Rajesh, Hmmm.... I have never encountered a field wiring problem that caused a processor not to be able to reach A7--but I haven't encountered every possible field problem, either. <b>HOWEVER,</b> there <i>should</i> have been a Diagnostic Alarm to indicate a problem. Thanks for the...