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Chandra, I think I like JFBjr's approach the best, after giving it much consideration. If it's not too late, you should use his method, and, again--be CERTAIN to inform everyone (operators, supervisors, technicians) exactly how it was done, and provide a written drawing of the results of...

Hello, NVS, The turbine is a Frame <b>5</b>, and the control system is a Mark <b>V</b> Speedtronic. Intermittent problems, especially Diagnostic Alarms, are difficult to troubleshoot. And, you didn't tell us if the Mark <b>V</b> was a TMR or a SIMPLEX control panel. In any case, ALL of...

G.Rajesh, Thanks for the thumbs-up! It was difficult getting the "drawing" to scale correctly; hope it was not too difficult to understand.

I've only participated in doing this once, and it was such a contested process, with everyone who was involved in the procedure had a different idea about how it should be done. One thing is for sure: You will need to use some mechanical means (usually a hydraulic jack) to move the shaft back...

Javier, It's not Possible to include attachments to control.com posts because of unscrupulous people who would embed viruses and malware in the attachments. Many people post files to web hosting services such tinypic.com or speedyshare.com. As for me, I don't have Toolbox any longer so I...

Javier, I, personally, have no experience with this method of preservation, or with a request for prolonged opening of steam valves. I am surprised that when the unit reaches zero speed the ETRs on the TREG drop out; it must be some single shaft-specific configuration that is done in...

Ideally, it should be (re-)applied approximately every two years, or as per the conductive grease manufacturer's recommendations. The actual frequency is a function of ambient conditions (humidity; heat; dust; etc). The key is not to apply too much grease at any one time, and to...

>MODERATOR: I wasn't aware of a character-per-line limit. Can you please post the "new" sketch below in place of the other(s)? Thanks! <pre> --------------------- ----------------------- Mark V PTBA | | Mark V PTBA...

Ridha, Thanks for the feedback! I'm currently on a re-start of a GE-design heavy duty gas turbine that is also experiencing some problems that can only be attributed to mechanical causes and there is pressure--by the mechanical department--to blame the problems on the control system. It's...

MODERATOR: Something terribly wrong happened with the previous post! Can you please replace that post with the one below? PLEASE? Thanks!!! NVK, The description below presumes the signal name for the Gas Fuel Trip Solenoid output "relay" is L20FG1X. Some sites use L20FGX; some sites use...

MODERATOR: Something terribly wrong happened with the previous post! Can you please replace that post with the one below? PLEASE? Thanks!!! NVK, The description below presumes the signal name for the Gas Fuel Trip Solenoid output "relay" is L20FG1X. Some sites use L20FGX; some sites use...

JFB, Jr., You're not the first person to ever accuse me of being too verbose, so no offense taken. I would say your assessment of the possibilities is very close to being correct, if not right on. I would posit that the Mark V logic, likely written by the same person who was responsible...

Dhinesh, control.com has an excellent 'Search' feature at the far right of the Menu bar at the top of every control.com page. Use the following search term: +"static frequency converter" just as typed above. You will find several good threads with lots of information guaranteed to...

mohamed, There is current, and there is reactive current. You're on the right track, with P & Q. The power triangle pretty much is all the maths and formula I need. Except for F = (P * N)/120. I know that when I hold excitation constant and increase the energy flow-rate to the prime...

Ultimately, the position reference is summed with the actual position and any null bias is "added" to the output current. This is done at the TCQA card level. Unfortunately, I don't recall exactly how the valve test is performed, but if I recall correctly the logic and sequencing is done in...

Zeylemi, I don't believe you're going to find a standard about cooling of an enclosure, and if you did it would have nothing to do with the number cards in the enclosure. Because just about every card (by any manufacturer) will have a slightly different heat dissipation and cooling...

Ridha, > -The problem is that the vibrations were also measured using an external > vibration tester along with its sensors and cables. >The results were normal: >3.5 mm/s in turbine and 2,8 mm/s in compressor brg How were the external measurements performed? I'm not clear about...

JP, When TTRXS is less than TTRXP that alarm will be annunciated.

Ahmed, Thanks for the feedback! This is an excellent example of immediately jumping to the conclusion that a problem is being caused by the Speedtronic. Troubleshooting problems by starting with the assumption that the problem is in or is being caused by the Speedtronic is usually...

mohammad saeed, That is the ideal operating condition for the "supplier" (generator). VAr flow and power factor will change if the system (grid) voltage changes, and it usually does change throughout the day. Operators will respond to system voltage changes by adjusting excitation to...