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skbarc, So, the DG, when running by itself supplying the "house" loads for the plant and auxiliaries for the GT it is, or should be, in Isochronous Speed Control mode. And, technically, when synchronizing a second unit to a running unit it should be in Droop Speed Control Mode. And...

Hira, Back when I started working on GE Mark V turbine control systems, I was terrified of the ARCnet-based StageLink--worried that if there were a problem it would be extremely difficult to find and resolve in the field. My fears--at that time--were for naught, as the initial implementations...

Amal, So, I need to make a correction. The allowable range of null bias current is -0.13% to -4.00%, or -2.67% +/-1.33%--for a TMR control system. That corresponds to -0.8 mA, +/0.4 mA TOTAL for a TMR control system, where 100% equals 10 mA (and -100% equals -10 mA). And, it may be helpful...

ManishKR, There was a period of time, right around the commissioning time-frame you cited, where GE was transitioning from the hard-wired low oil pressure contact in the Aux. Hyd. Oil Pump motor starter control circuit to wiring the contact to the Mark V and then using software for the...

Amal, Describe the method used to check/verify BOTH servo-current polarity AND to adjust the null bias. Describe how the servo current(s) was(were) being measured. Was the servo-valve new, refurbished, or in-service for some time prior to this "calibration?" What was the null bias...

Chiranjeevi, It could be one of several, depending on which type of combustion system, if the unit is operating in Simple Cycle or Combined Cycle mode, etc. Work "backwards" from CSRGVOUT to find the MIN VALUE selector function in the IGV control scheme--it shouldn't be very "far" from the...

Aptx4869, On the HMI(s) supplied with the unit, there are LOTS of GEH-nnnnn.pdf files, which are the instruction manuals and user guides for the various products GE Salem (Virginia, USA) publishes. GEH-6700.pdf appears to the the ToolboxST User Guide for Mark VIe Control. GEH-6700U.pdf...

khoriwal000, CPD pushes on the liquid fuel in the system (distillate fuel is non-compressible!) and that pushes on the bottom of the liquid fuel stop valve plug. Find the drawing of the liquid fuel stop valve in the Parts section of the Operation & Service Manuals provided with the unit...

What happens when you right-click on the block?

I have to confess--my experience is with typical GE-provided sequencing (application code), and not with Hitachi-provided sequencing (application code). It seems Hitachi is using the typical GE heavy duty gas turbine control allowable exhaust temperature spread block, but there is a logic signal...

It's always been my understanding that any water or steam injected into a gas turbine was vapourized and lost and gone forever out the exhaust stack. There were some attempts a few years back to try to recover (by various methods) at least some of the water vapour, but they weren't economically...

Aptx489, We sympathize with your frustration--but without 1) actionable data, and, 2) the ability to review the application code running in the turbine control system at your site, it's virtually impossible to say much more than has been said.

Isulamu, Primary Frequency Response can only be used when the unit is at Part Load in Droop Speed Control. (Pre-Selected Load Control mode is used when the unit is in Droop Speed Control mode, though some sites use it to stay in Base Load--which is another poor usage of Pre-Selected Load...

Abubakar_96, I should have added that GE (the writer of the block used in some turbine control systems provided with Hitachi units) recognizes that, at times, during loading and unloading the fuel flow-rates and IGV movements can cause unusual changes in exhaust temperature profiles, and so...

Abubakar_9 I don't have access to any software with the block that calculates TTXSPL, but you say both CPD and CTD are stable. If I recall correctly, TTXM is another of the major inputs to the block that calculates TTXSPL. What is TTXM doing? Whenever a load change is underway, the...

boosterhidrogen, I do not. It's a fairly hot topic in the power generation industry; you can probably find some information and white papers on the Internet. I don't know what GE formally calls their efforts in the power generation industry but they are probably linking it to their Predix...

fudge, GE has at least two versions of a mode they affectionately refer to as 'Primary Frequency Response.' It's a "special" mode of Pre-Selected Load Control that senses changes in turbine speed (frequency) and allows the turbine control system to respond in the appropriate manner...

Milo, Thanks for the feedback! >will try with a different version of IDOS, and also changing >the COM port. Why aren't you using 4.7--I believe that was the last version of IDOS GE released. I would expect the last version released would be the most recent version. I believe if you...

I agree, "unplanned" means it's just that--unplanned. Historically, reducing unplanned downtime was attributed to planned maintenance and attention to detail. The latter took trained, experienced people to check and recognize potential problems. In today's world, those people are disappearing...

Milo, Hmmm.... Copying IDOS from another system shouldn't really cause a problem--BUT, IDOS was written for very specific versions of BIOS chipsets and it doesn't always work well with just any BIOS on a compatible motherboard. (meaning, a motherboard with ISA slots for an ARCnet card for...