Search results

MHWest, If I recall correctly, it was in the early 2000's, and it took a while (maybe a year and a half) to identify the problem, and I think there was a PSB (Product Service Bulletin) or maybe even a TIL about it. The TCPS cards would emit a high-pitched but low-volume "screeching" noise...

>Yes, of course. Did you know that MANY Mark* turbine control systems DO NOT have <DACA>s? <DACA>s are KNOWN to accentuate any AC input voltage spikes or dips. They are NOT filters. Even the <CPF> filter module is NOT there to protect against issues with input power spikes and dips--they...

Aptx4869, Here's an example of SIFT. Many GE-design heavy duty gas turbines use a single temperature switch to alarm on high L.O. Temperature (temperature greater than 165 deg F). That temperature switch may be connected to a TBCI terminal board that "fans out" (distributes) the one signal to...

Jolek, C^2 has a valid concern--failed capacitors in the battery charger can be very problematic and even destructive (to cards in the Mark V, or Mark VI). And switching power sources can make spikes and dips in voltage output from a battery charger with bad cap's even worse. And...

Atpx4869, I'm going to echo Chiranjeevi's comment to refer to the Mark VI System Guiude, GEH-6421, Vol's. I & II. Vol. I has a lot of generic information, and Vol. II has a lot of hardware-specific information. I would also remind you that the HMI usually has a LOT of GEH's and GEI's and...

Interesting little tidbit of information.... Do the units have <DACA> AC-to-DC conversion modules as back/ups to the 125 VDC supply?

Jolene, How many times has this occurred? Is there an active 125 VDC Battery Ground alarm? Is the ground persistent or intermittent? Have you replaced the TCPS card of the processor with the intermittent power supply voltage Diagnostic Alarms?

Aptx4869, In general, the GE turbine control design philosophies of redundancy and voting are built around the idea of criticality. If a signal is deemed critical, then it is usually redundant and voted. Beginning with Mark V, the concept of SIFT (Software-Implemented Fault Tolerance) was...

amanat, Have you checked the generator casing "belly" drains to see if there's moisture of any kind in the generator casing? It could be that the generator casing liquid level detector(s) aren't working or stuck, and there's no indication because the switches aren't working for some reason...

JJss, It could also be that the polarity of the servo current from <R> being applied to its servo coil is incorrect.

gilariver, Thanks VERY MUCH for the feedback! It helps a LOT of people to know how issues are resolved.

JJss, Looking back at some of your previous posts, you have some very serious misunderstandings of redundancy. Redundancy can be accomplished in many ways, not always in the same way--and GE, to be sure, has used about all of the various ways to implement redundancy. In the Mark IV and...

What hydrogen purity analyzers are the unit using? GE, for many decades, used a wheat-stone bridge type of hydrogen purity analyzer, before switching to a digital analyzer. They have used, at various times, eOne analyzers, Druck analyzers, Yokogawa analyzers, and Panametrics analyzers (those are...

Thank you for the information. It's probably about time for the torque converter to get exchanged like you've been doing with the other units. But, you should not rule out oil quality, torque converter strainer cleanliness, and 20TU-2 condition. You mentioned "turn gear", and I wonder if...

fahadalam, If I had a nickel (5 cents US; $0.05) for every time I've heard, "It's NEVER done THAT before! Why did it do THAT??!?!" I would be a very rich man, VERY rich. Obscenely rich. Based on the information provided, it's impossible to try to even guess as to what might have happened...

briq, I happen to be at a site today looking at some Belfort Mark VIe application code (which just <b><i>defies</b></i> logic and normal programming practice) and I ran across a TIMER_SEC macro. I left-clicked on the macro block and it opened the macro to be able to see the primitive...

amant, I want to add that the normal sensing location for hydrogen purity is the seal drain enlargment tanks at each of the generator (turbine end and collector end), because that's where air is liberated from the seal oil. Eventually, the hydrogen/air in the seal drain enlargement tank gets...

amant, Have you changed the scavenging flow-rates at all since the seal oil flow-rates increased? Presuming the hydrogen purity hasn't changed, the ONLY way for air to get into a generator that is at approximately 2 barg is through liberation from the seal oil flowing into the seal areas...

briq, Have you tried right-clicking on the block and then selecting 'Item Help'? If it's NOT a macro, it's possible there is a help for the block. Some blocks do not have help available--but when you click on 'Item Help' if there is no help available for the block it will pop up a dialog...

khoriwal000, >>Are you absolutely certain that all air has been bled from >>the cooling water side of the AA pre-cooler? > ans- yes AA1 drain is checked and no condensate is >present. AA1 drain drains the air side of the heat exchanger. Impossible as it is to believe, if there is air...