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KKK, Thanks for the reply. But, I'm not a combustion engineer. You should ask these questions of GE, and you would do well to have some samples of the gas fuel you were supplied after the "scrapping". Something seems really wrong with the fuel you received for some period of time...

> CSA, the Primary variable comes to the Mark V at .... I'm missing something real fundamental here.... The title of this thread is "Hart Tri-Loop not working with GE Mark VIe" and John Gardner is the originator. Now, John Gardner is replying saying the device is connected to four...

> CSA... I must admit your behavior is consistent! Thanks, Phil Corso. I do pride myself on being consistent, as most engineers (oddly enough) are not. But, I did/do understand your explanation. So, consistently, I am confused by your post. I think it best if we just agree to...

(Sorry; I didn't mean to shout.)

> For how long time we have to put the GE frame 9E DLN machine on turning gear if > the GT trips and the turning gear is not engaged within 30 min before GT start? If I understand the question correctly, then there is no time which the unit must be put on turning gear before being started...

You need to provide the time-stamps for each of the alarms.

Phil Corso, Yes!

Here is an interesting Internet search engine result (remove any spaces inserted by the website's software): http://www.turbomachinerymag.com/white%20papers/Seaworthy_whitepaper.pdf It doesn't explain why "varnishing" is worse at low temperature. It does indicate the formation of varnish...

I haven't done a lot of research on the mechanism of varnishing, but why does low temperature make varnishing worse? There have been a number of peaking or load following F-class sites that report stroking of the IGV actuator prior to scheduled operation. It usually involves forcing logic and...

Phil Corso, As I said earlier (more than six months earlier), I think the reason people don't understand the Neutral Disconnect switch (89ND) is because they don't understand why the neutral needs to be disconnected from earth during motoring (starting) operation, and then re-connected during...

So, you've answered your own question. And put it in context. $20 difference between the drives; possible future upgrade potential. Does this apply to every VFD/motor application? Likely not. In my experience, impedance is the issue when matching/mating drives and motors. Some require...

This problem is related to two issues: temperature and lube oil formulation. I'm presuming the servo you're having the most trouble with is the IGV servo.... That's just a sway, but it seems to be the most common complaint. The gas valve servos also seem to be problematic at some sites, but...

Such a big motor in the example: 0.5 HP. How much difference (cost) do you think there is between a 0.5 HP drive vs. a 1.0 HP drive? How much difference (cost) do you think there is between a 20 HP drive vs. a 30 HP drive, or a 25 HP drive? You say you "heard" it's often a good practice...

> However, I would like to give you a word of advice... stop shouting so much!!! Advice about shouting, punctuated with three (3) exclamation points no less. Seriously?

Just in case it wasn't clear, if you do the clean-up, you shouldn't need to do any puts/gets/HMI devices/Signal Manager, because you're just making the hard disk/OS more efficient. And, adding RAM, or moving the cleaned HD to a newer, faster Advantech with more RAM, would not require...

Alarms don't mean anything, until the turbine trips. Everyone knows that. Especially Diagnostic Alarms. And, then it's the last trip alarm that's the one that caused the turbine to trip; everyone knows that, too. (NOT.) But, I digress. If you want to understand what is causing the turbine...

It would be very expensive to install the instrumentation necessary to equate Gas Control Valve position to fuel flow-rate with any degree of accuracy and repeatability. And, the accuracy of LVDT calibration would be very critical as well. You would also need to know the Cv of the Gas...

> (I didn't understand the 'Teaming" concept?) Teaming is a method of using multiple Ethernet cards for redundancy; seems like the Advantech isn't using teaming, which makes things a "little" easier. If you tried to install eTCSS (Toolbox, TCI, etc.) and CIMPLICITY from a CD, then copy...

> No trends are available. <b>WHY NOT?</b> > 1)Why Droop mode GT is picking load? Impossible to say given the information provided. <b>What is happening to the frequency? What is the load on the Isochronous unit when this alleged unusual behaviour is occurring?</b> > 2)Why TG-701...

> because all gas turbines are set in a steel frame in which the frame can be > adjusted without moving the actual turbine... Can you please explain in more detail? Thanks!