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Jotang84, If VAr control mode is selected and a VAr setpoint is entered the Speedtronic will maintain the VAr setpoint while the unit is running, and if the load setpoint changes. If Power Factor control mode is selected and a power factor setpoint is entered the Speedtronic will maintain...

G.Rajesh, Long time no hear from you; welcome back. I believe markvguy wrote replies to several threads describing how to use the LCC/SLCC display and keypad to troubleshoot an inability to reach I/O State A7. You're going to have to find out which card isn't reaching A6 and then solve...

Ahem, > This technology is widely being used in today's combined-cycle and co-gen GT > based power plants, achieving efficiency up to 47%. It's not being used as widely as George would have us believe. For the reasons he cited: Water (it's cost to obtain); it's treatment (essentially it...

neo, Welcome back; I've been a little busy, also, so it hasn't been a problem. So, I'm taking it that you're satisfied with the L4 rung (<Q> application code) discussion(s)? I'm really curious, though, to finish the starting means thing. Your started that thread saying you'd been asked...

Thanks for the feedback!

8784597, The SRV tries to control the pressure between the SRV and the GCV. To know if it's working correctly, check FPRG and FPG2--they should be equal. And if FPG2 is equal to FPRG, then the SRV control is not the problem. If they're equal then it sounds like the fuel gas supply pressure...

Saudaslam, It seems I don't have the answer to your question. Perhaps another contributor to control.com will step in and help.

Saudaslam, Good, seemingly simple, question; extremely difficult to answer because it depends on how the generator-set is being operated. The short answer goes like this: If the machine was operating at its rated output for the current machine- and ambient conditions when the frequency...

Lube oil quality, or, rather, the lack thereof, is usually the cause of most electro-hydraulic servo-valve failures. The internal passages of most servo-valves are pretty small, and what tends to happen is that particulates and varnish tend to collect and "plate" in these passages which then...

> The new word is VERFIFY. CuriousOne, You said a mouthful! ;-)

WAC, What Diagnostic Alarms are being annunciated? The reference for the second-stage nozzle position is speed (LP speed during starting; HP speed during normal operation). And the feedback is LP speed during starting and HP sped during normal operation. Usually there will be Diagnostic...

All, Just to clarify--the Speedtronic (Mark VI in this thread, per the original poster) <b>requires</b> a momentary contact closure to initiate a START--not a maintained contact. (In fact, most all Speedtronic command inputs are momentary, not maintained--even to select a particular fuel, a...

Jim Crown, Good morning to you, also. I've heard of people attempting this at high load (at or near 90% load) but without success. All of the gas fuel valves have to operate in perfect sequence (including purge valves) and it just usually doesn't work out very well. Especially if the gas...

George, I think many of us would take exception at some of your statements about testing before shipment. For auxiliary equipments which are "mass-"produced in some quantity (say, four or ten per month) which have very little variability (say cooling water modules, or filter skids) there's...

Any, To verify the accuracy of the calibration of any sensor one needs to know how the sensor works. If you are referring to velocity type vibration pick-ups (sensors), commonly called "seismic" vibration pick-ups, they have a small weight suspended from the top of the sensor housing with a...

> The original definition was "Distributed Control System<b>!</b> Chill, Phil. It was a play on an abbreviation, since they are distributed AND centralized control systems these days. And they were when the original DCSs were released, too. It's almost a misnomer--really just a marketing...

mohanad, When did this problem start? After the liquid fuel pump servo-valve was changed? I'm presuming there is LVDT feedback, so did the problem start after someone "calibrated" the liquid fuel pump swash plate LVDT(s) or replaced an LVDT on the liquid fuel pump swash plate? This...

Roy, > How come they always like to centralize it? This one's easy--DCS stands for: Distributed Centralized System I've never personally understood the whole 'distributed' thing. Newer control systems, and some technologically advanced older ones, do have the capability to have I/O...

A pressure switch could be used in series with the aux contact to indicate the pump is producing pressure. Or a speed switch.

Gary, I used my preferred Internet search engine with the following search term: "what is the difference between pipe and tube size?" (with the double quotes) I learned that the O.D. of a piece of tubing is generally equal to the size of the piece of tubing. And the wall thickness of...