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ControlEng999, So, about searching the World Wide Web for information.... Sometimes one can get extremely lucky and find the results in the first page, or sometimes on subsequent pages of search results. But, searching means using different search terms and using key words and terms from your...

ControlEng999, "... I think that in my case I need to wait some documentations from GE and their subcontractors ..." What is your "case"? Is a new MS5002E being installed at your plant? Are you working at a new plant where an MS5002E is being installed? Have you seen this video? It looks...

ControlEng999, It would seem that you don't have access to the Application Code running in the Mark VIe, nor the P&IDs for the unit. Yes, a Control Spec would be of some help, but one would STILL require the Application Code (the program viewable in ToolboxST) and the P&IDs to make sense of...

No. If you've read the threads, you know that TTRXB (contrary to popular, false belief) DOES NOT stand for Base Load Exhaust Temperature Reference. It stands for Biased Exhaust Temperature Reference--and the bias is usually added only for two-shaft machines and special applications (of which...

gtengineer, If I'm not mistaken, the graphs you provided are ONLY of IGV LVDT feedback. If that's true, then someone was changing the IGV reference in steps--which is what the graphs show, step changes in position. When you are using "AutoCalibrate" to manually change the IGV position...

gtengineer, Yes. That's what the spikes mean. They are pointing to the hydraulic actuator, or the IGV rack and gear mechanism. The cylinder walls of the actuator or the actuator piston stem can be scored, causing mechanic binding. On one really severe case it was found that three of the four...

sonacontrol, Hmmm .... Well, those jaw clutch teeth are pretty damaged. (They get damaged by closing them before the unit reaches zero speed when trying to re-start. (That's the most common method of damage, anyway.)) Jaw clutches rely on two (2) things to stay closed: 1) the angle of the...

gtengineer, How can improper servo current polarity contribute to this problem? When a lot of force is required and one of the servo currents is fighting the other two, that can be a problem. I would be most suspicious of the hydraulic actuator OR the rack and gears--given the new information...

gtengineer, People are always surprised to learn how much force it takes to hold IGVs in a steady-state position, or to move them, when the axial compressor is running at rated speed. It's a good deal of force. And that force comes from hydraulic pressure and flow, through the servo valve...

munny07, You didn't mention a requirement for specific leakage rates.... As was mentioned, the application/service the valve(s) will be used in have a very large impact on the choice of valves. And, also, come companies have preferred methods of achieving the desired operating...

munny07, The choice really depends on several factors. 1) Service/Application What kind of fluid (liquid or gaseous)? 2) Speed of closing required for the shutdown application If you need fast closing action, you need to take this into consideration when choosing an actuator for either a...

sirdee90, Can you post a screen capture of the Alarm Display, or a clear photo of the Alarm Window? What is the date of the HMI (by double-clicking on the time in the Status Tray at the lower right corner of the MS-Windows screen? Does the HMI have a Master Time signal from a Master Time...

Hadi, It's clear English is not your first language. Please explain as best as possible what you mean by ”boom load”--as that appears to be the reason for beginning to use Limiter Control when you had been using Speed Control. That's a change in operating procedure--the type of change that...

syed taha ahmed, So, there are two types of exciters (also called AVRs--Automatic Voltage Regulators): brushed and brushless. Most GE-design F-class units use an exciter (AVR) to control the voltage on the synchronous generator rotor (through brushes and slip-rings--so it's a brushed system of...

hadi, From the date on the SLD it's presumed the plant is going through commissioning and having some difficulties. The name of the transformer isn't the problem; but, it could be signs of other (larger) problems. You hit the nail on the head with the change in operations from speed control...

Hi, Akhmed, My watch isn't working. Can you help me? I tried shaking it, but it didn't help. What could be the problem? Would you need to know if the watch was mechanical or digital? Does the watch have a mechanical mechanism, or a battery-operated mechanism? Would it be helpful to know if the...

I especially like the fact that two--not one, but two--transformers are named T11 on the SLD (Single Line Diagram).... Very interesting. But, the governors (505s) need to be in speed control mode when the grid separation occurs; "limiter" mode is probably not going to work to achieve the...

And, hadi, I was just sitting down to write that part of the problem is likely that the 505 isn't switching from limiter (I presume Inlet Pressure Limiter or Load Limiter????) control to speed control at the instant the utility tie breaker opens. I think you are going to need to work with a...

If you're expecting 1, has this ever worked as you expected before? Or is this new behaviour? I'm no 505 expert, and I would have to read the manual to determine how it can be switched into Isochronous Speed Control. BUT, only one steam turbine can be switched into Isochronous! And if the...

munny07, GREAT QUESTIONS--for the manufacturers/suppliers of thermocouples. Perhaps you could look at some data sheets for various T/C sheath dimensions to get some idea. www.omega.com usually has some very excellent written materials about temperature measurement and the various methods and...