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GE has PROM upgrades that would likely resolve many of these Diagnostic Alarms. But, at a cost, of course. Some of them were published in TILs (Technical Information Letters); some were not. I also personally believe that sometimes as power supplies get older the voltage regulators begin to...

Kumar, you say you have two machines. Are both machines experiencing the same problems? Or just one? And when did these problems start? How long have they existed? I have seen a similar problem on a Mark VI installation once before, and it was very difficult to troubleshoot and find, but...

What part of this response did you not understand? http://control.com/thread/1287750928#1288056095 (Copy and paste the URL above into your Web browser, or just search control.com for your previous post on this same issue.)

This is an old thread.... And this topic has been smothered to death on (speed)control.com. Whenever two governors are in Isoch mode (without some kind of Isoch Load Sharing scheme) they will "fight" each other to control the frequency. That's their nature, and they're not disposed to...

I want to address one issue that was not completely addressed in my previous response, that of when the various modes can be used and when you can switch between them. We don't know if your power island can be operated in parallel with a larger grid or if it's continuously isolated. If your...

I forgot to ask what the exhaust temperature reference values are when this occurs. What is the value of TTRXP? What is the value of TTRXS? What is the value of TTRX?

MS-7001E units are usually nominally rated for about 70-80 MW, which is Base Load, exhaust temperature control. In a hot and/or humid environment that rating can decrease to less than 70 MW because of ambient conditions (high air temperature, high humidity, high elevation, etc.). But, for a...

If you have three generators each with a capacity of 20 MW, and a total system load of 36 MW, and you are operating two of the generators in Droop control mode each with 12 MW of load, then the third generator will also have 12 MW of load. If the third generator is in Isoch mode, if the load...

The re-booting all processors all at once usually only works if one or two processors have different timer/counter values from the other processors. And, it's not powering them up all at the same time, it's powering them all down at the same time, then powering them up one at a time that allows...

Here's the logic that A. Oztas was referring to: <pre> L14HSX L63HQ1LY L52HQ L4HQZ ---| |--------| |--------|/|------------------( ) | | | | L4 | L14HSZ |...

Kevin, This is the part that people never seem to understand when it comes to islanded operation: <b>It takes constant vigilance of the load on the Isoch machine, with adjustments to the droop machine(s) to keep good frequency control.</b> Everyone seems to think it's just a "set it and...

When you own the machine, and there is no contractual obligation for any warranty or guarantee from a contractual services provider, you are free to operate the machine, and to automate functions, as you see fit for your site and operating conditions. You seem to have covered most of the...

Historically, steam turbines were started and run for months, years even. It's really only in the last couple of decades that steam turbines have been cycled in load-following and combined cycle applications. GE is sometimes slow to change. For years, the turbine control system they provided...

We don't know how old the HMIs are at your site, nor what the OS is. But, it would seem that there is no regular or periodic back-up procedure for the site which would have created "image" disks (CDs or DVDs) which could be used to restore a known working configuration to a new hard drive...

GE has been changing their Piping Schematic (P&ID) drawings over the last few years, so the depictions aren't always the same. On the drawings I'm familiar with, each measurement was associated with a specific level, such as 71QH-1, 71QL-1, Normal, etc. They were usually shown at one side or...

And I'll add another two cents. Even new and clean inlet air filters represent a loss of inlet air flow and therefore inlet efficiency. If you've ever worn some kind of dust- or hospital mask over your nose and mouth you've experienced something similar. Your ability to inhale is restricted...

Have you consulted the Woodward manual for information? If so, what does it say? When did this problem begin? Most prime mover (engine, turbine, etc.) controllers try to control speed, so the integrity of the speed feedback is critical to the protection of the equipment as well as the...

Did someone "calibrate" or make any changes to the calibration or configuration or set-up of the expansion probe/sensor?

You need to look at the Piping Schematic (P&ID) for the L.O. System and look at the various components which might be not functioning properly. It's a complete mystery why the Main L.O. Pump discharge pressure is dropping so quickly. It's a positive displacement pump and the pressure is...

If the ratchet mechanism is one of the "self-sequencers" then the likely cause of the alarm is a failure of the 33HR-1 limit switch to indicate that an end of forward stroke had been reached in some period of time (some machines were set for 6.0 minutes, some shorter, some longer). If 20CS-1...