Search results

Baffoe, Is your post from the same site as the following post: https://control.com/thread/1535930053 It's most likely that because the problem in the URL above is not controls-related and no one who has read the threads has any suggestions or information that there have been no...

Problems with flow at the nozzle can cause problems with the stability of the liquid fuel system, especially if things like the servo gain are not correct. Just because a check valve isn't, or multiple check valves aren't, working doesn't mean it is not, or they are not, working in a smooth...

TheGingerBeer, SIMPLEX panels do seem to have some idiosyncrasies not shared by their TMR brethren. When did this problem start? What happened before the problem started? My guess is, based on my understanding of your post details (and I'm not sure I quite understand exactly what is...

novice001, What I've attempted to draw below is a graph, with TTRX (or TTXM) on the left, vertical axis. Exhaust temperature (reference or exhaust) increases vertically, from bottom to top. CPR (or CPD) on the horizontal axis at the bottom. Compressor pressure (ratio or discharge) increases...

DK Sarma, <i>Based on the information provided,</i> it's most likely the problem was the assumption that by putting the excitation in Manual that it would start at some minimum (very low) voltage and could be raised using the Manual RAISE VOLTAGE button (or RAISE CURRENT). Most excitation...

DK Sarma, My watch stopped working. What could be the problem? How would you start trying to help me troubleshoot the problem, over the World Wide Web, without knowing if the watch is digital or analog? If it has a battery or if it has a spring mechanism? You haven't told what fuel the...

deePATIDAR92, Yes, indeed, the flow divider can be a cause of hunting. It's presumed the unit has the horizontal liquid fuel flow divider, where all the wheels are connected with each other, and to one or two toothed wheels, which the speed pick-ups are monitoring. The bearings of the flow...

novice001, If the unit is operating on Base Load (CPR-biased exh temp control), no matter what the exhaust temperature reference (TTRX) is, the firing temperature is constant. Again, the exhaust temperature reference curve represents <b>constant</b> firing temperature. TTRF1 is a...

mhwest, As I near retirement I am more and more aware of slight communication issues that have--and do--cause serious misunderstandings, and a lot of wasted time, effort and money. I'm 1000% certain the original poster assumes if data and commands can be communicated between the Mark* and the...

IIXM should have been TTXM.... Gotta love splcjeqrs. Sometimes. NOT.

sardar108, Typically, you are overthinking this. You can turn on IGV exhaust temperature control while the unit is at Base Load--nothing will happen (because the IGVs are at maximum operating angle and IIXM equals TTRX). I think if you look at TTRXGV while the unit is at Base Load you will...

Dear, You were specifically asked what the P2 pressure reference Control Constants are, what the firing speed is and what the actual P2 pressure is--in an effort to understand what the parameters for control are. It also seems the GE-design Frame 5 heavy duty gas turbine has a gas fuel...

I have to agree with ME42--18 months seems ... abnormally long. There must be something we're not knowing about this. I know of recent Mark VI-Mark VIe platform upgrades (not a full-blown rip-and-replace--and I'm not sure exactly what you're getting: a platform upgrade or a rip-and-replace) that...

novice001, TTRX is ALWAYS being calculated, even when the unit is not running. It is fed to BOTH the IGV Exhaust Temperature Control algorithm AND the CPD- (CPR-biased) Exhaust Temperature Control algorithm. IF IGV Exhaust Temperature control is enabled and active, it will use TTRX to move...

If the signal is present in the DCS (Emerson Ovation), AND you have a spare 4-20 mA output signal channel and can configure the channel to use the signal to drive the output, that would seem to be the best solution since you can't easily get to the cable tray for the Mark V signals. You can...

Shyam, You really haven't given us very much information to act on. 1) How much does the exhaust temperature increase during firing? 2) What are the values of TTXSP1, TTXSP2 and TTXSP3 just before the firing time (T2F) expires? 3) You say there was a major overhaul. Were the gas...

Thanks, ME42, for the information! There really aren&#8217;t that many options that don't involve "going through the HMI." GE intended it to be that way, because they don't want "just anyone" communicating with--and sending commands to--the Mark* controller(s). There was a very recent...

sardar108, MANY plants use IGV Exhaust Temperature Control. In fact, most units with DLN combustors use IGV Exhaust Temperature Control whether or not they exhaust into an HRSG, and they can't disable it--it's always on. It's proven technology that's been around for decades. It looks at...

Topcat, I believe if time synchronization is enabled and one sets the date from the command prompt that in a short time it will be overwritten by the master time source. It looks like TCI and the Mark V indeed have some offset. The most logical place would be in one of the time...

TrailRanger, When did the problem start? If you search the hard drive(s) of the HMI(s) you should find at least two TIMESYNC.DAT files. One should be in a folder called DATA on the G: drive and the other is usually in the root of F: drive (but having said that, we don't know what vintage...