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Ali, Good question about the status of I/O cards, because an I/O card can be at A7 and then go to another status, and the processor can remain at A7. If any of the processors was not at A7, then the unit could not have been started. However, after a START in is progress, if a processor is...

I don't have any links, but there are companies around the world that sell training videos about power plants and turbines. You could do an Internet search and look for them. I've even seen some for sale once on eBay (isn't it amazing what you can find on eBay??!!?). Lastly, I'm have been...

Neither.

control.com has this really neat feature called 'Search'. I actually typed 'thermocouple compensation cable' into Google and ended up with a result that took me to this thread in control.com: http://www.control.com/thread/1026182245 So, there's two ways to find the same information: using...

The only way to be certain what the NOx emissions are is to have a continuous emissions monitor that is properly maintained. Wet low NOx injection is usually only used in order to lower emissions to a level defined by a permit issued to the site. Injecting water (or steam) is not cheap, in...

Do you know what the brownish color liquid is? Could it be rusty water? You need to have the liquid tested to know what is in it, and then ask this question of Siemens after the constituents are known.

Thomas, You have posted here before and I, and I'm sure others, have visited your Company's website. There is some information I didn't find there that would be useful in helping to compare your system against a Speedtronic, or any other system being proposed for replacement of a GE...

You seem to have obtained a good deal of information from the self-sequencer designer that would be very useful to myself and others. Can you take a few minutes and summarize some of the details of how the ratchet mechanism works, how the self-sequencer interacts with it, and what the four...

This topic has been covered several times on control.com. Use the search term 'cooldown', because a ratchet mechanism is one of the methods used for the cooldown of a GE-design heavy duty gas turbine. Before the wheelspace T/C temperatures were used as the permissive for allowing a unit to be...

Thank you, M. Griffin! I tried several substitutions, but didn't think about the good old ampersand. As for the Flash thing, is it a security concern or a space concern or a memory concern? Or just that you don't visit many sites on that particular PC that require Flash? (I'm just curious, by...

This is where the Internet and the World Web shine. Many people can read these questions and the answers, and when feedback is provided, it adds even more value to the effort. control.com has provided the forum; we need to honour their commitment and dedication by providing meaningful and...

The only way that an in increase in electrical load can decrease speed is if the load is greater than the generation. So, if the load is 20MW and the frequency is stable, if the load increases to 21 MW (actually any value above 20MW) and fuel is not increased then the speed (and the frequency...

The clarification should help you a lot. If it's not the turbine side of the clutch that's reversing or rotating backwards, then it is most likely a problem with the self-sequencer, VH-14, which includes 20CS and a plunger to actuate 33HR. Because the only reason that the pistons which are...

DEV, Sir, I sincerely hope you do <b>not</b> have a doubt. You have a <b>question</b>. Oxford English Dictionary defines doubt as a feeling of distrust or disbelief; to question the truth of. Nothing we say here is intended to mislead anyone. And it's perfectly acceptable in polite...

Economy <b>is</b> the question. And the reasons for having a second earthing network (grid), isolated from any other earthing network, is a matter of economy, also. Damage caused by lightning strikes or high-voltage or high-current faults to control systems connected to one single earthing...

The concepts of a hydrogen-cooled generator are very simple. As current flows in a conductor, heat is generated. A generator has a lot of conductors and a lot of current flowing through the conductors, generating a lot of heat. If that heat isn't "removed" then the windings will be damaged...

I will disagree with this. > It is normally used when unit is stand still to ground the circulating current that present during the operation. < I don't believe circulating currents which were present when the unit was running will still be there when the unit is at standstill, so this...

Okay; this is a problem which has just started after a mechanical outage of the turbine, and no new control system was installed. The speed pick-ups and brackets were removed and re-installed using (initially) the same probes, and the toothed speed pick-up has not changed. The probes were...

The ambient conditions at any site will always determine how often a water wash (online or offline) should be done, and will also have a large impact on the efficiency of any on-line washing. On-line washing is really only effective for the initial stages of the axial compressor, because the...

An RTD circuit works on a varying resistance (as a function of temperature). If the wires used to connect the RTD to the monitor/control system are long, then they will add to the total resistance of the circuit and negatively impact the feedback. The reason for the third wire in an RTD...