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SB, Some of the best controls TAs (Technical Advisors) I've ever worked with started as mechanical TAs. The control system isn't just the Mark [whatever]--it includes valves (control and manual!), and solenoids, and pumps and fans and fuel nozzles and spark plugs. And, before one can be a...

ARI1969, Unfortunately, I don't believe GE has documented that Lean-Lean and Primary are transitory modes--it's just implied. Again, because low NOx emissions are the reason for DLN-I combustion systems, and NOx emissions are lowest when operating in Premix Steady-state combustion mode. The...

humble3, It worked fine! More, please!

fluidflow, Hmmm. The old Generator Nameplate game. Just because a generator is <b>capable</b> of operating at nameplate rating does NOT mean it is intended to be operated at nameplate rating, or that it has to be operated at nameplate rating. In fact, operating it at a power factor closer to...

JFB, I would be honored to carry your tool bag, sir, just to be able to learn at the foot of one of the true, original steam turbine Masters. I'm glad you didn't say "new field engineers" because they aren't 'engineers' anymore; they're just human relays to the PAC and they aren't even...

N.V.Q, One of the main criteria for the design of the Mark VIe was to expand it to use as more than just a turbine control system--to be a DCS and balance of plant control system. If only GE would use something else for their HMI software (besides CIMPLICITY/PROFICY) they might actually sell...

SB, My main purpose in pointing out that the contacts are all NC (Normally Closed) is that it's related to the whole inversion masking philosophy--that logic signals are a logic "1" when the unit is to be tripped, not when the condition is "normal." If the trip logic signal is derived from a...

humble3, Thanks for the feedback! Unfortunately, pictures can't be posted to control.com. Others have used free webhosting sites like tinypic.com to upload pictures and files to and then post the link to the file for people to access and see the information. It's free, but it does require...

N.V.Q, For any piece of rotating equipment driving an AC generator speed control is most important. For steam turbines, preventing overspeed is very critical. As you so correctly noted, project requirements do dictate other modes of control. There is Acceleration Control, Load Control...

fluidflow, I would suggest the same thing: Use your preferred Internet search engine to research "reactive power correction" and develop your own understanding of the subject. In the power generation world, lagging VArs (the result of an inductive load) must be supplied to keep the...

fluidflow, That would depend on lots of factors. There is usually a temperature drop at the bell mouth/IGVs. And, I don't know what the flashpoint of oil vapors is for turbine lube oil at CPD. I think the oil will collect on the axial compressor, making it extremely "dirty" and decreasing...

Neo, We're just learning here, so it's understandable if you miss the <b>false</b> contacts in the rungs. There was also a <b>false</b> in one of the parallel strings of the fire protection rung (L45FTX). I don't know why we're missing so many things here, but we are. <b>L86GT</b><pre>...

sreekanth, I am leery of writing any detailed response to this query until I understand what you mean by "HVAC." High Voltage Alternating Current OR Heating, Ventilation and Air Conditioning? >- Can the PDM and VPRO limits of the lower/over voltage input be adjusted? Not that I...

Ram, You'll probably have more luck using your preferred Internet search engine with the term: "power factor correction" The double quotes should help narrow down the search. As one responder here on control.com is fond of saying: There really is no such thing as reactive "power."...

N.V.Q, I don't understand the question, and it's not clear from the question if you have studied the response and comprehend the logic diagram. The output can't be a logic "1" unless and until the input transitions to logic "1", and then the output will go to logic "1" for the time period...

This is a great question for GE. There are multiple revisions of GER-3620; the last one I saw was "R"--which is Rev. #18 in GE-speak, so you may be reading from an older version.?.?.? Primary- and Lean-Lean combustion modes are transitory modes, meaning they are just modes through which DLN-I...

Neo, I'm working on a response. Got sidetracked with inversion masking; sorry.

fluidflow, When a situation like this comes up on a unit which has been running properly in the past, the first thing one should always do is ask: What has changed? When did this problem start? If the mist eliminator has been working properly for some time, and then it stops working...

be_anon, Thanks for the information! So, the diagnostic <i>circuit</i> operates each time the exciter (the ignitor power supply) is energized (so when l2tvx1 is a logic "1"). And a <i>relay</i> in the diagnostic circuit operates when there is a fault (low output or low spark rate)...

Batman, I have a better thread (not forum--control.com is the forum, which has individual threads (questions)): http://www.control.com/thread/1026245600#1026245640 Try this and see if it's helpful or not. (I <b>HOPE</b> it is!) And to your comment about not helping a stranger, we're...