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Neo,<pre> > L3RS L1S L4 L1XX L5EX L3SFLT L1X >---||------||-------||--------||------|/|----|/|------( ) > L14HT | | L4Y | >---||---- |----||----- > L1X | >-------||-------</pre> >L14HT = Cooldown slow roll start speed relay >L5EX =...

Just some clarification.... In general, a CEMS (Continuous Emissions Monitoring System) is a means of monitoring emissions from an engine or a stack exit or anywhere in between. Some sites monitor gas turbine exhaust (before it enters either a HRSG (Heat Recovery Steam Generator: a boiler) or a...

Ivan, When the generator breaker is closed it's typical for GE-designed synchronizing circuits (which is where the PT signals come from--on GE-designed systems) to open the Generator PT circuit, removing the generator voltage signal. This is because, essentially, the generator voltage is...

Ivan, When do these alarms occur? During normal full speed operation with the generator breaker closed? At some point during start-up or shutdown? Some combination of the times? Why did the TCEA cards fail? You can trace the PT signals (SVL is the running or "bus" PT input; and DV is...

Neo, You didn't post L1X.... It's kind of critical to the whole discussion. And, it's also kind of complicated (not really) so we're probably better off without it for now. Let's start with L1Z (as good a place as any to start!). When L1Z is a logic "0" then the auxiliaries will start and...

VM, Can you please post the relevant lines (rows) from IO.ASG? What happened when you put the signal name (from the second column in the row in IO.ASG) in a Demand Display or Logic Forcing Display? What units/values were displayed (presuming the unit was running)? The third column in...

Suryapradhu, Transformer tap changers are available in different configurations, and without understanding how yours is configured--I'm very reluctant to make more comments. There are two basic types of AC machines: Synchronous and Induction. Most engine-driven generators (and turbines are...

Manoj, You seem to be providing conflicting information, and you also say, "...Practically, we had <i>observed</i>...." You said in an earlier post the frequency had increased to 52.15 Hz, and now you said some tripping had occurred at 51.6 Hz, and the unit has 4% Droop (I imagine that you...

Neo, Can you repeat question/response, please? I don't want to comment on L1X, L1Z until you post the rungs from the application code in the Mark VIe at YOUR site.

Dan, It should not. You can easily just determinate the speed pickups from the AIO TB and the check to see if the 'Ready to Start' indication is adversely affected, and if there are no problems during a subsequent START with the speed pickups disconnected everything should be okay. I...

Manoj, 1) The fuel was not high at the time of isolation--it drifted higher. There are two possible reasons: First, the Active Load decreased over the time period in question. And, second, the fuel valve is developing a sticking problem--could be the valve or dirty oil causing a problem with...

Neo, You don't have to ask--no one does! I wouldn't comment until you posted L1x and L1Z from the application code in your Mark VIe anyway.

Neo, You used to use the Thumbs Up/Thumbs Down indicator when you found the post useful or helpful.... Hmmm, l72qez, well, that input has caused more disagreements with colleagues than just about any other (except for humidity sensor/monitor commissioning). (GE...

suryapadhu, Thank you for taking the time to search through the archived threads looking for an answer to your question(s). 1) Do the transformers at your site have load tap changers, capable of changing taps while the transformer is energized and current is flowing through the...

Neo, There was another query in the original post, and we'll get to that in a moment. I would like you to post the L4CRT rung, if you would, please. I'm curious to know if it's been changed from what it's been for decades--based on the Longname description. Now, as for understanding...

VM, Hmmm.... Well, even if these signals appear in the IO.ASG for a unit, it's not certain they are available or accessible for that unit. (Isn't GE fun that way?) I'm presuming the generator is using an EX2000 exciter, that communicates with the Mark V using Status-S communication...

Hi, Neo, I'm a little confused about where to pick up with the L4 journey at this point.... I know you have some questions, but, as with this post there are typographical/spelling errors which I find it difficult to work through. For a Frame 6B the starting sequence should be that when a...

Manoj Baviskar, To answer your direct question: No; it's not possible for reactive load throw-off ("rejection") to cause an overspeed. It's more likely what happened was that the turbine was operating in Droop speed control mode when it was synchronized to the grid, and then when it was...

Izhar, and others following this thread, I need to qualify a statement I made in the third paragraph of the response above: >... Until you know that value you will NOT know >if the torque converter is transmitting the >amount of torque required to break the >turbine away from zero...

Marcos Gonzales, Few answers... 1. Reverse power isn't bad for the generator--it's bad for the prime mover. Because the generator actually becomes a motor and tries to drive the prime mover (steam turbine; reciprocating engine; gas turbine; etc.). So, in effect there's not sufficient fuel...