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Your question isn't clear. There is a minimum amount of time that a unit must be on cooldown ("turning gear") before it is taken off cooldown, or, when the shaft is allowed to coast down at zero RPM, and is considered to be "at rest." When the unit is off cooldown (off "turning gear"), there...

You stated "...A control guy..." required 25 starts/stops to resolve a "fault." But, you didn't state what "the fault" was, or why it was necessary to start and stop the unit to find "the fault", nor did you state over what time period these 25 starts/stops took place. You didn't say what the...

The answer to your first question is: No. The answer to your second question lies in the type of turning gear and starting means used on the machine at your site. The logic is written to protect the machine and its auxiliaries. The answer to your third question is to ask GE to see if...

I can tell you that you have a Frame 6 machine with a Mark IV controller. DDEC is Digital Diesel Engine Controller. It's an electronic fuel rack control that is being provided with new units with diesel starting means. You would have to contact your local diesel supplier to see if they...

4_20ma, Again, just because a turbine starts successfully doesn't mean it's starting correctly, or that the start is the best for the machine. I suggest you find the Control Specification drawing that was provided with the Speedtronic panel. It's usually in the Service Manuals provided...

It's very encouraging to see that people can copy-and-paste. This procedure is site-specific, <b>AND</b> it is only for the primary electrical overspeed function. It also presumes the Speedtronic panel is a Mark V with a later-generation GE Mark V HMI. <b>AND</b> the responder didn't...

This thread is like a slow death by starvation, with periodic feedings of a couple of dried and moldy bread crumbs. As CSA has also said, have someone knowledgeable come to site to assist with the problem. We don't even know if the Speedtronic is a Mark V or a Mark VI; we have virtually no...

4_20ma, You say the unit at your site has an adjustable torque converter (Torque Adjuster). If that is true, then I would say the Torque Adjuster limit switches are *NOT* adjusted properly. I'm making this statement with the following caveat: It is a typical GE-design Frame 9E heavy duty gas...

RY, Please ensure you "capture" the speed at which the unit is running when the Liquid Fuel Stop Valve opens and fuel starts flowing and the spark plugs are energized. Also, it would be very helpful to know the values of TNK14HM1 and TNK14HM2 for the GE-design Frame 9E at your site. So...

Dear yasser, Who can say for sure what the GE manager was trying to elicit from your response? Perhaps he was asking if you look at the Trip Display and the Start-check Display on the HMI to determine if there were any active trips or conditions preventing a READY TO START indication...

There are several things that need correcting here. First, the exhaust temperature control "curves" represents <b>constant FIRING temperature</b>, <b>**NOT**</b> constant exhaust temperature. The temperature of the combustion gases leaving the first stage nozzles is the firing temperature...

4_20ma, My most recent reply was not directed at your question; it was directed at the original poster, RY. However, your post intrigues me (though I'm sure I'm going to regret asking). What is the value of TNK14HM1 and TNK14HM2 at your site? These are the pick-up and drop-out values of...

Please have a knowledgeable person come to site to assist with the problem.

sardar9, Why do you say: >If we put these values in formula >with TNH, results are low P2 pressure. >But with RPM it follows correctly. Please tell us where you obtained this formula with 0.08 as the gain. And where you obtained the -25 value you are citing as the Offset. If we use...

I have one more <b>very important</b> question: <b>At what speed is firing occurring?</b> In other words, when (at what speed, in percent of rated) does the operator interface indicate "FIRING" and the Liq. Fuel Stop Valve open and the spark plugs get energized? Is it 10% speed? Or 12%...

Dear 4_20ma, How nice to hear from you again, on a different topic (not that we know if you were "satisfied" with the responses to the last topic you wished to argue about). Without being able to see the P&IDs and CSP for the unit at your site, I can't comment exactly on how each component...

<b>When did this problem start?</b> After a maintenance outage? After a card was replaced? If it was after a card was replaced, which card was replaced, and why was it replaced? You can follow all of this by looking at the Signal Flow Diagrams in Appendix D of the Mark V Application Manual...

Phil Corso, 2) Everyone knows that when a generator is run as a motor that it has to rotate in the opposite direction. Vinu should be able to observe this when the turbine at his site is being started using the generator as a motor to supply torque to the turbine shaft. The turbine gets up...

Have a read of the P&IDs for the Cooling Water Systems of the units. You will likely find expected heat rejection values, pressures, and flow-rates. And, not being a thermodynamics engineer nor having ever had to deal with any heat rejection issues (except once) I can't make any analysis or...

I was under the impression you had the GE version of 'Primary Frequency Response', but it appears you do not. Actually, it's not clear exactly what you have, except some interface to the DCS. I'm suggesting the problem is <b>NOT</b> the droop characteristic of the Speedtronic. Without...