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It's not clear from your post if the alarm is still active (status "1") or if it had cleared when it was noticed. In general, this alarm occurs when the Designated Processor switches from <R> to another controller. This can be caused by UCVx problems and has been attributed to VCMI problems...

When you read the Mark V Application Manual, GEH-5980, about adding inputs and outputs, what part(s) didn't you understand? Have you researched similar signals in the Mark V and seen how they are assigned and scaled? As for adding a signal to the Demand Display, have you read the Mark V...

Hi, Okay; makes sense about the silencer. As for sending the P&ID, some people have posted drawings on some file-sharing websites (www.tinypic.com, for example) and then posted the URL here on control.com. The likelihood of a failure of the booster atomizing air compressor, if properly...

As Bob Johnston suggests, when did the problem start? After a maintenance outage? To Bob Johnston's reply I would add that I would be surprised if there was natural gas leaking from the cross-fire tubes. And, if there is any flow into or out of the cross-fire tubes, that in itself is not a...

Damene, Further to this, you say you have upgraded *many* units to Mark VI and electric gas control valves. And, yet, only this one unit has had a problem? There are lots of electric gas control valves in service around the world, and per your own description, multiple valves on units you...

Yes; it's true. 50100 RPM sounds like a reasonable speed for the Main AA Compressor (CA1). They usually have their own speed-increasing gear box. The Accessory Gear Box on which CA1 is mounted should have its own nameplate, and the speed of the various output shafts should be listed on the...

Damene, Whoa there! You say it has been determined ... By whom was it determined? And how was it determined? What does the supplier of the control system and the electric gas valve have to say about this? How long has the unit been running with the new turbine control system and the...

Please be clear: "...not start on diesel but start on gas..." Does that mean you have tried to start the unit on distillate but it won't fire, won't accelerate? What process alarms are annunciated when you try to start on diesel? Or does it mean your operating procedures don't specify that...

Most people want to replace electro-hydraulic servo-valves and hydraulic actuators because they have experienced lots of problems with either the servos or the actuators, or both. Most of those problems are self-inflicted, because of poor L.O. maintenance practices. In recent years, the oil...

As was said before, the IGVs "seem" to control exhaust temperature in DLN machines, but really the exhaust temperature control is the factor which controls the IGV angle, and the designers know (approximately) what the air flow is at various IGV angles so that's how they "control" the fuel/air...

You are experiencing problems with exhaust T/C feedback which is causing the exhaust temperature spread (the differential between exhaust temperature T/C readings) to be high, which is an indication of combustion problems (cracked liner; fuel nozzle problems; failed side seals; failed hula skirt...

There is a saying that goes like this: You can pay my now, or you can pay me later. There's another one that says: You get what you pay for. You failed one card after an electrical storm. You have a report of another failed card at another site. If you have a TMR Mark VI, I would...

RichT88, It's good that we got the whole story; thanks! I still suspect that there's something not quite right with the ignitor tips or insertion depth on Unit 5. I've seen many machines where one of the two ignitors has not worked properly for some period of time, and it wasn't discovered...

We would need to be able to see the sequencing or application code running in the Speedtronic to be able to tell you exactly what you need to do and how. I don't know if it's as simple as just adding a new Control Constant. How would the new Constant be used in the comparator for only the...

That would be "Master GE" to most of us, or as we affectionately referred to it as employees, "The General" or "The <b>G</b>od of the <b>East</b>" (GE, get it?).

Mike Borelli, you didn't read the post. The originator was talking about a load rejection, which is an event which causes the generator breaker to open but does not cause a trip of the turbine. The originator wasn't referring to a turbine trip, just a generator breaker trip that leaves the...

I'm someone who benefited tremendously (both professionally and personally) from the generosity and patience of several very special and wonderful people many years ago that's just trying to share the benefit of their gift to me with others. I learned more than things from them; I learned how to...

That depends on a lot of factors, and some tuning and testing. What you're referring to is commonly called 'load rejection', and when it occurs at Base (full) Load it's commonly called 'full load rejection'. The unit is going to overspeed (meaning, the speed is going to be above 100%) but the...

You first posted that the TSVO card was failing; now you're posting that the VSVO card is failing. You say care has been taken about electronic earthing (functional earth), but then you say "reasonably good earthing." I wouldn't associate care with anything that's "reasonably good". That's...

Dev, So many questions and assumed relationships. You failed to tell us that the unit(s) at your site has(have) DLN combustors; it makes something of a difference when responding to questions. When a unit is operating at Base Load on CPD- (CPR-) biased exhaust temperature control, the...