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Mike Borelli, You are most welcome for any insights I have provided. AutoCal on the Mark V uses an ASCII text file (ACALIB.DAT, if I recall correctly--but I'm having a memory lapse at the moment) which lists the ends of travel for the various servo-valve outputs. For the IGVs, one needs to...

ESKAY, LOCATE LOW and LOCATE HIGH are used to tell the Mark IV what position (in percent of actual, physical stroke) the device is in. To do this you need to know what the total stroke (travel) of the device is. And, when working on combined SRV/GCV gas valve assemblies on a Frame 5 or -6B...

Davidmcc, As a former GE employee (I no longer work for GE) I don't have access to any of their drawing archive systems. And, I believe machines of that vintage are in an older, French archive which didn't have an English front end for years. Unfortunately, I also believe the Service...

Presuming the Moderator's Note is correct, and the original poster is talking about synchronous generators, the answer is: Yes. Synchronous generator speed and frequency is a function of the number of poles of the generator. A two-pole generator operating at 50 Hz would have to rotate at 3000...

Mike Borelli, I'm presuming you are referring to a Mark V Speedtronic turbine control panel since you refer to "iocfg." Regardless, LVDTs are no different than pressure switches or temperature transmitters. The as-found condition should be checked using a known source, and adjusted if...

You haven't told us what Frame size the machine is, or what kind of hydraulic ratchet system you have (self-sequencer, or individual pressure switches on forward- and retraction stroke rams). I'm going to presume the unit has a self-sequencer mechanism (small block-shaped device with some...

ESKAY, I now see you are asking new and different questions, and the information you are providing is different! I'm becoming even more confused--it that's even possible. You wrote about Mk4 servo calibration in this newest post to a thread originally about liquid fuel bypass valve...

ESKAY, I sense your frustration. I, too, for a couple of years as a new GE employee was under the mistaken belief that liquid fuel bypass valves--indeed, any servo-operated device on a GE-design heavy duty gas turbine--required "calibration." It wasn't until I really thought about and...

vm, That value, while field-adjustable, is not meant to be "tuned" in the field. It is a factory-determined value which is used to keep the regulators in a TMR control panel from drifting apart by too much under normal operating circumstances. It should be left as found. If you provide...

Sunil, <b>When did this problem start?</b> After one of the cards you listed was replaced? After some other cards were replaced in <R>? It certainly seems there is some loose or intermittent connection of the IONET cabling for <R>, which you have discovered runs from <R> (the TCQC if I...

Davidmcc, Good to hear you have located the heaters. Sounds like a very circuitous route--and unnecessary cable length--for the immersion heaters. (It is noted that you didn't confirm if the Frame 6B is a European-packaged unit, or a US-packaged unit. I have horror stories about the placement...

Davidmcc, Typically, the immersion heaters used on GE-design heavy duty gas turbines are in large diameter pipes inserted into the L.O. Tank from the left side of the Accessory Base. (The L.O. Tank Level Gauge/switches, L.O. Coolers and L.O. Filters are typically located on the right side of...

Akhtar, Water injection definitely has an effect on exhaust temperature, but not as much as some think. <b>When operating at Base Load</b> water injection reduces exhaust temperature slightly, which the Speedtronic interprets as a decrease in exhaust temperature versus the exhaust temperature...

ESKAY, I thought we'd been over this before.... http://www.control.com/thread/1336557419 Nothing has changed since then. Nothing.

ESKAY, This idea of "calibrating servo-operated devices" on GE-design heavy duty gas turbines is a <b>HUGE</b> myth. It's simply <b>not possible</b> to calibrate anything other than LVDT feedback. Even when GE field personnel say they are "calibrating" the SRV or the GCV or the IGVs or the...

Bob Johnston, I have seen some non-GE packaged units which did not have transfer fill valves, making transfer on-line iffy, at best. In those cases, it was necessary to transfer to the newly-replaced filter for a brief time--while off-line--to fill the newly-replaced filter and -canister and...

MWO, I don't have a copy of Toolbox or a .m6b file for a gas turbine to review. To be specific, it would be necessary to see the .m6b file in use at your site. FSKMINU2 is not used on some applications, so, again--to be specific would require a review of the .m6b file in use at your site...

Sagir, Is it possible that the Rev. C switch failures have caused some problem(s) with the 28 VDC power supplies or with the 28 VDC power distribution to the N-tron switches resulting in intermittent problems with the Rev. D switches? Do you have the ability to monitor the 28 VDC power...

Fyzal, If this is a problem with some kind of L.O. leak in the #2 Brg. area (which is what I suspect), then if the smoking is continuous and as bad as you say then the L.O. Tank level would be decreasing and would require replenishment of the L.O. Has anyone checked the L.O. Tank level...

MWO, Certainly a diesel starting means which is not being controlled correctly could be the cause of the problem. The Mark IV was not very good at controlling acceleration during starting, but the Mark VI is much, much better. There was no clear reasoning for changing the speed level...