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The compressor protection is usually accomplished in two places--the sequencing, or application code, running in the control processors (<R>, <S> & <T>) and in the firmware on one of the I/O cards (depends on the version of Mark*). The protection in the sequencing/application code runs at the...

ENGORABY, It is only possible to adjust the null bias spring tension with a proper test apparatus (oil, at the proper pressure and temperature, with a very accurate method for measuring the coils currents AND the oil flow-rates). In my experience, virtually every servo that someone has...

Genersi, Try this URL: http://www.qualitrolcorp.com/grid-applications/oil-gas/ You can send them an email or call them and ask them if they still sell the indicators with the level switches, or ask them if they can recommend a replacement. Hope this helps! Please write back to let us...

chiranjeevi, Here's an example of how to use the 'Search' feature of control.com. So, we were talking about drain wire grounding (earthing) (weren't we?), and maybe it could be a little clearer with a drawing. I typed the search term:<pre> +"drain wire"</pre>into the 'Search' field...

chiranjeevi, In the days of the Mark IV, the use of EEPROM was not widespread, in fact when the Mark IV was first designed and produced the <C> processor used battery-back RAM (BRAM) to store sequencing and information. <R>, <S> & <T> did have to go to get programming information from <C>...

chiranjeevi, You are most likely correct--there is some issue with the wiring (should be TSP (Twisted, Shielded Pair) wiring, with a drain wire to shunt electrical noise to ground (earth)), most likely with the shield drain wires. The convention is the shield of any circuit of twisted...

sardar99, I'm hoping demigrog will contribute and clarify any statement I make here. In the Mark IV (remember that?) there was a <C> controller, and its main purpose was to display the voted/median/high select value of signals and data. There were three control processors and each...

6bturbinetech, 1) Some types of varnish can cause a discoloration on some types of filters. (But read on for more information.) And, by "failures" are you saying the filter ruptured and dirt and dirty oil went down stream? 2) This topic has been covered many times before on control.com...

chiranjeevi, The GE "How to ...." publications are GHTs (the GE publication number begins with "GHT-"). And, pins and functions are Mark VI terms. It's Software and Variables in Mark VIe. Ain't this stuff fuuunnn????!

chiranjeevi, I don't have access at this writing to a Mark VIe to check any steps, but you are mostly correct. You have to create the "pin" to create the signal name (the convention is to use lower-case alpha characters for I/O signal names) in the 'Functions ' (I think that's what the...

Yasin, Did you look at the references in the application code for VSR-1 & VSR-11? I'd bet large gazoonies (whatever currency you would prefer) the references for both these valves when the unit is not running is either -25% or -40%. And the feedback (from the LVDTs) is approximately 0%...

chiranjeevi, <b>>>>CORRECTION<<<</b> >... and controlled by switches J2R, J1S and J1T. should read: "... and controlled by switches J<b>1</b>R, J1S and J1T." Sorry for any confusion.

Ismailijaffer, The "requirement" can come from a LOT of sources, and we don't know the range of the ages of the units in your scientific study. The Customer may have a requirement or a contract specification which forces NP to include a sensor. The Customer's insurance company may have a...

chiranjeevi, Well, there is an <R> processor, an <S> processor and a <T> processor. And the power supplies for the three independent and redundant control processors are (or should be) supplied by cables connected to plugs labeled and controlled by switches J2R, J1S and J1T. The Mark VIe...

chiranjeevi, The topic of electro-hydraulic servo-valves as used on GE-design heavy duty gas turbines has been covered extensively over more than twelve years on control.com. And all of the questions and answers--the good ones and the bad ones--are available via the 'Search' feature at the...

AutoCalibrate has a method for manually stroking the device. Put in a manual set point/reference of 0 DGa and measure the angle, and then change the setpoint/reference to 100 DGA and measure the angle. Stop the manual position feature, input the measurements for min and max, download to the...

chiranjeevi, You are referring to a Mark VIe turbine control system, correct? 1. Before you begin an AutoCalibration procedure, if you don't tell AutoCalibrate what the fully closed- and fully open IGV positions are then it can't properly calibrate (scale) the LVDT feedback. Without...

6bturbinetech, I did not mean to imply that you implied there was an LTRUE coil. I have been to three sites where someone inserted an LTRUE (or LFALSE) coil in sequencing (because they believed the lack of one (or the other) was causing problems, or to try to change the operation of one LTRUE...

The splitting proportions are not the same for DLN-I and DLN-2.6. Some units which have Quaternary fuel don't use it. And even for units with DLN-I the splits aren't always the same. The splits for both type of DLN are adjusted during tuning to achieve the desired emissions. FSR is the total...

samrannaveed, First--and most important of all--the heat rate of most gas turbines is rarely, if ever, guaranteed at part load. Heat rate is only ever guaranteed at Base Load, when the IGVs are full open and the unit is exhaust temperature control. Part load heat rate is NOT good, because the...