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deshapriya, Any of those control systems you mentioned would do the job you are asking about. Why? Because they are all programmable logic (or action) controllers and can be programmed to do a myriad of different and wonderful things. BUT, you shouldn't be buying a control system based solely...

Shawrochis, Can you supply a diagram of the steam supply system to the HP turbine, including stop valve(s), governing (control) valves, and first-stage turbine nozzles? The diagram should indicate where the various pressure measurements are taken. Also, if there are extractions (controlled or...

All, I am prefacing this explanation by saying I am NOT a vibration analyst--not in any way shape or form. I only know what I've read (which isn't much--because vibration analysis has never been interesting to me), and what I have heard (which is always questionable, because we all "hear" the...

Raf80, I have only seen one site that truly had a process (I don't know as I ever saw a written procedure)--that EVERYONE followed. They used a "Frig Log"--a logbook kept in the Central Control Room where ANY and EVERY Control System change (variable/setpoint change; forced logic; adding a...

Whoa. I am many things--but a vibration analyst is NOT one of them. I was really trying to point out this is a controls-related forum. Vibration analysis; oil analysis; these are things which are not varied, regulated or controlled by the turbine control & protection system. I have seen oil...

Is this like "forcing" something to prevent tripping or shutting down? "Inhibiting" a trip or a shutdown?

There isn't really the same kind of "back-up" exhaust overtemperature control in the TMR as in the SIMPLEX. In the SIMPLEX, there is only one control processor, so the designers of the Mark V decided to include (I'm sure at the urging of the turbine designers and warranters!) a back-up...

Carlo_Muro_, I know this is an old thread, and I don't know how I missed your last two posts; sorry! Anyway, these are very good explanations. I think I want to add something that is maybe not obvious to some--and that is, I believe, the 7FA.04 units have multiple stages of variable axial...

Hi, all, I don't disagree that Control Constants can be tuned to help with some of this, but, the question remains: Why did it start, and only after the MI? And suggesting Control Constants can be "tuned" without suggesting which ones should be tuned and how, well, that's not very helpful...

topcat123, Many thanks for the update/feedback!!! Yes, there is a different scheme employed for SIMPLEX units than for TMR units when it comes to preventing servo output current. I don't have access to a Mark VI System Guide at this time, but I thought that was only for a portion (not all) of...

David Waxman, Thank you very much for the feedback!

Yoganak/Ken, Thanks for the complete answers to the questions! This is odd, certainly. It's been a very long time since I looked at the vibration protection masks but I wonder if this has something to do with the problem(s) as well. (By masking I mean the Control Constants that are passed to...

syed taha ahmed, Find the P&IDs (Piping and Instrmentation Diagrams) for the various systems of the turbine-generator and auxiliaries. (GE has called them Piping Schematics, or Schematic Piping Diagrams). They show, in very simple terms, how systems work and work together. You may find these...

syed taha ahmed, Let me explain again, ... Actually, you need to provide pictures of the equipment you are describing. Diode set.... pn [sic] excitor compartment.... During startup the diode wheel pull down.... The SFC (Static Frequency Converter) uses diode-like devices to convert AC...

Is this a controls issue? Is the thickness of the oil wedge monitored or controlled by the TurboTronics? If you have actual excessive vibration, and it seems to coincide with the readings on the turbine control system, then it's not a sensor/control system issue. And, most rotating machines...

RATM, Look--I get it. I do. It's a testosterone thing--men love to 'force' things, even on a digital, microprocessor-based turbine control system. Forcing makes them feel powerful--that they are not constrained by any inhuman control system or scheme. Except, that common sense and logic should...

Yoganak, Lots of questions come to mind; I don't have access to a PC to look closely at the attachments (yet). Does the unit have a Gas Transfer Valve that is in use during the LL-PM combustion mode transfer? What alarms (Process & Diagnostic) are present before and during the LL-PM...

praveenkumar_k, What has prompted this question? Was some mechanical work done on the unit which involved making adjustments to the jacking oil system? What have you done to try to resolve the problem? What IS the problem? Are you not getting enough lift? Too much lift? To my knowledge...

abdulwahab05, I have used products and software from Triangle MicroWorks in the past. Their support and Customer Service around the world was great. They probably have a product or products which will work for your application. trianglemicroworks.com I found them by using the term "iec...

Mohamedibr752, As you have noted, we are control gentlemen--heavy emphasis on gentle. This question (how to replace generator bearing packing) is not really related to controls. The generator manufacturer should have provided a manual of some sort, usually even a parts list drawing will...