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ecie, A couple of additional questions. First, when you are using the Manual feature of AutoCalibrate to stroke the GCV, what is the maximum reference you are entering? 100%? What happens if you try 128%? Or 127%? And what is the current for EACH processor when you put in 127% when using...

ecie, Hmmm.... First, if replacing the servo has solved the issue or a similar issue in the past, then it kind of says to me that the problem is NOT the Mark VI. Second, you did NOT say what Diagnostic Alarms are being annunciated by each of the three VSVO cards. Third, you are correct...

After, "WOW!!!" I would say if the unit has been "operating" without 20DV being connected to and energized/de-energized by the turbine control system, then either it's not required for proper operation of the unit, OR something has been tweaked (field-modified) to allow operation of the unit...

Generally, "excessive" turning gear operation isn't a bad thing; it does consume a lot of electrical power to keep the pumps running, etc. HOWEVER, GE now says for some units that two hours on turning gear is the equivalent of one hour of fired operation <b><i>for the purposes of calculating...

RH, There are just some things for which the unit must be shut down to troubleshoot. Speed pick-ups are critical inputs.... I absolutely DO NOT recommend changing the deviation value. If the alarm is "bothering" the operators, then tell them to Lock the alarm until such time as the unit...

RH, If the unit uses six (6) speed pick-ups (one for each of <R>, <S>, & <T>, and <X>, <Y>, & <Z>) there is a problem with either the wiring/terminations of the speed pick-up connected to <X> or that speed pick-up is failing, or that speed pick-up's gap is incorrect. If there are only...

kh00, > Will it not increase CTIM also? CTIM is measured at, or just outside of (next to), the axial compressor bellmouth. Some newer units measure ambient temperature with sensors on the outside of the inlet filter structure, but that's a newer instrumentation addition for a lot of...

khoriwal000, I believe the problem with your suggestion is two-fold: First, you need to remove the moisture from the air, and cooling it before running it through the "desiccant" is the best way to do so. Second, I don't know if you could just bypass the cooler and run the hot air through...

karakule3353, I presume you are asking about forced cooling of the axial compressor and turbine rotor? Forced cooling involves using the starting means to spin the rotor at a faster speed than when on cooldown in order to force more air through the compressor, turbine and exhaust to cool the...

Sorry for any confusion! >There should be a >block with a name similar to TTXSPVn, where the 'n' is a >number which denotes the revision of the block.

msnatish333, The exact formula for deriving TTXM is in the application code running in the Mark VIe controlling and protecting your GE-design Frame 9E heavy duty gas turbine. There should be a block with a name similar to Thumbnail, where the 'n' is a number which denotes the revision of the...

HI, kirinjiee, There is a problem with the Shutdown FSR Control Constants, and/or the Minimum FSR Control Constant, that prevented the fuel from being reduced enough to allow the turbine speed to decelerate while flame is being maintained (called a fired shutdown). There is a timer of...

HisExcellency, OEMs (like GE, and probably Hitachi) publish documents with formulae and procedures for this very purpose. The GE publication number, if I recall correctly, is GTS-111D. (I think the "D" refers to a revision designation; later alphabetic characters are newer revisions.) It...

Ratanlal, The commissioning person <b>should NOT</b> have been allowed to leave the site with any Diagnostic Alarms active on the Mark VIe. Having said that, if I understand your post correctly, you are saying that unused I/O is causing Diagnostic Alarms--such as unused thermocouple inputs...

Bayram, I believe there is a procedure in the Mark V Maintenance Manual, GEH-5980. You have to set the Berg (hardware) jumpers on the new card in the same positions as on the existing card. Shut off the 125 VDC power to the core. Then you have to remove the SLCC from the from of the...

Thank you, mfrasca12! I was trying to recall the number of this TIL as I was wondering if it was applicable. Sounds like it is or might be, and this is good information, anyway.

>I have never heard of a PLC getting a Virus, ... I may be wrong, but wasn't the Stuxnet virus one that propagated from PC to PC and when it found one that was connected to a Siemens PLC was able to download itself to the PLC and cause the PLC to not do it's job of control and protection...

Djafer, This tells there is something amiss with the <P> rack and/or VPROs. It could be the power supply(ies) to the <P> rack. I don't have access to the Mark VI System Guide, GEH-6421, at this writing, but if I recall correctly the VPROs are powered from the <PD> core with 125 VDC, so if...

VJ/vijaycontrol, Let's try this another way. Can you please list the documents you have in your possession? For example, have you been able to obtain copies of the P&IDs (GE calls them "Piping Schematics" or "Schematic Piping Diagrams")? Have you been able to find a printed copy of the I/O...

VJ/vijaycontrol, Now, now. No need for all cap's. It was a fair question, and unless one is familiar with the line of control systems and the OEM's (lack of) support for "older" control systems a reasonable one. It's been written many times before on control.com--if you want to learn about...