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Kelly2019, >Who is the manufacturer of The motor on ratchet pump for GE >frame 3? How old is the unit? Many older units included mayor nameplate data in the start-up report. If the packager of the unit auxiliaries was GE, it’svery likely the motor was manufactured by GE...

Wallter, Verify Current and Verify Position are not necessary for verification of proper calibration. They are useful for troubleshooting problems to determine if the LVDT output is non-linear or the servo spool might be sticking or the hydraulic actuator might be worn or sticking. They are...

The PGT 25+ is an aircraft derivative engine, and as such, the control schemes are based on those used for aircraft derivative engines, using the signals associated with various sensors. I think you need to find the operations manuals provided with the engine and have a look through the...

Bucket cooling is not controlled by the turbine control system.

Hello, pippo87, As you have learnt, it's possible to have Diagnostic Alarms (on the LCC/SLCC Display) even if the processor(s) is(are) in I/O State A7. A card (or memory) can have problems without changing the I/O State of the entire processor. You provided very good information! I'm going...

Wallter, For a manual SRV LVDT calibration you would change the regulator type from a Type 77 to a Type 43 in the I/O Configuration (for SVO1), save the changes, download I/O Configuration to the control processor(s), reboot the control processor(s), manually stroke the SRV to determine if...

Holykell, You ask many questions about level measurement, and make many statements about them as well. A good source for information about what types of level measurment work better for different applications and fluids is the sales and marketing people of the various suppliers you buy...

Have you used the Cooling Water P&ID (Piping Schematic) drawing to see if there are other ways cooling water interacts with lube oil? Usually, L.O. pressure in the L.O. heat exchangers (coolers) is higher than Cooling Water pressure, to prevent the possiblity of leakage of cooling water into...

MARKlaneV, The experiment can be tried an hour or two before the unit is to be put on line, and it doesn't involve firing the unit. Just put it CRANK mode, and perform the test(s). You may want to play around a little with the speed at which you close the IGVs. If the unit is slowing down too...

Of course, technical skill is important. But, being able to establish relationships with Customers who will have you back on site because of your technical skills--but also because you are pleasant and agreeable--is very important. VERY important. People can be trained to develop technical...

When purging at ~20-22% TNH the electric cranking motor on a GE-design Frame 7EA heavy duty gas turbine is (should be) drawing about 150%-160% of rated current. If the IGVs are open at starting and during purging the starting motor will not be able to spin the unit up to normal purging speed...

James, It's very difficult to provide a step-by-step troubleshooting procedure, because GE has used SO MANY different types of buttons over the years--and they have used almost every type of button on some recent jobs. There are SRTP buttons, text buttons, analog setpoint buttons, SMART...

Ratheesh, >We need to replace the VCMIH2CB card by the VCMIH2CC. what >are the procedures to follow after inserting the VCMIH2CC >instead of VCMIH2CB to reach the actual control state? Why don't you start by telling us why you feel it is necessary to replace the VCMI card? Next, what...

MARKlaneV, L20TV1X should have been L20TU1X. Sorry for any confusion.

MARKlaneV, Here's a thought.... As a test, set up Trend Recorder to monitor TNH, L2TV, CSGV, TNHA, L14HM, L83GVMAX, and L20TV1X, and then start it monitor a normal START and stop the Trend when the unit gets back to 10% speed after coasting down to firing speed. Then as a test when the...

MARKlaneV, >If the unit is allowed to fire at 21%<x<21.5%, it would >shorten the start time by ~4 minutes. Do you mind also shortening the hot gas path parts life probably by as much as 25%? Sure, these unit can be fired at purge speed--but it will take a lot more fuel to establish...

Thanks for the feedback!

municipalpower, It might also be helpful if you could provide the names and values of the Control Constants which have mysteriously changed. And one more thing, does anyone ever change these Control Constants to keep the unit in emissions compliance?

municipalpower, If the unit has one of the "newer" GE Mark V HMIs (which run some version of MS-Windows and CIMPLICITY or PROFICY Machine Edition) I believe (though I can't recall the name of the executable) there is an executable that can be used to look at the values of Control Constants in...

gustavo_marcelo, >How to use it actually? RTFM (Read The F......, er, uh, ... Fine Manual) GEH-6749 is conveniently included in the zipfile. As with ALL GE documentation, it is enough to get one started. And, that's about it. The rest is up to the user to discern through (much) trial and...