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The RS-232 MODBUS systems I worked on a few decades ago were all spec’ed to use TSP (Twisted, Shielded Pair) wiring. Those systems quite often used what were called short- or long-haul modems and TSP between them, as well as to/from the controllers and the modems. I was ordered to more than one...

You are welcome.

1) Not using twisted, shielded pairs can greatly increase the risk of induced voltages which may damage some electronics as well as negatively impact readings. You didn’t answer the question about grounding the shield drain wire at only ONE end. If it’s grounded at both ends that can cause...

1). Did you use twisted, shielded wire/cable for the interconnecting signal transmission—AND did you ground the shield drain wire only at ONE END? 2) Did you follow the power wiring recommendations of the protocol converter for the power wiring? 3) Did you run any of the interconnecting signal...

topcat123, MANY thanks for the feedback! My first commissioning job turned into a four month-long "resident engineer" assignment, and it was for a Frame 5 peaking unit which didn't run very much that summer. I had a LOT of time--and I wisely used it to go through the Operation & Maintenance...

nikid.control, Sorry; I don't do off-line or PM/DM (Personal Messages/Direct Messages). The really great thing about forums like this is that MANY people can read the exchanges and benefit from them. Taking discussions off-line benefits one person. Again, there are LOTS (thousands) of previous...

nikidi.control, a) What is your experience with control systems? b) What is your interest in the Mark VIe? As an operator of the turbine and driven device? An I&C (Instrumentation Controls Technician)? A field service person working on turbine control systems? A plant engineer with...

One of my MOST FAVORITE sayings is: "The good thing about standards is: There are so many to choose from!!!" And MODBUS certainly fits that statement perfectly. Is it a time sink? No doubt. But, then, wasn't DOS and isn't MS-Windows, and ... and ... and ... I used to really love my...

Curious_One, Yeah; GE stopped the practice of putting CT inputs to the <P> core because so many people don't know to short the CTs before lifting wires.... GE used a PLU (Power Load Unbalance)core for large steam turbines, too. But, the bigger problem with those inputs to the <P> core (and even...

Okay; so this is a step in the right direction. I'm not exactly familiar with each of the Bently-Nevada systems but it seems that most of the cards used in the monitor racks have BNC output connectors on the front card edge which provide a buffered output which can be conditioned and fed to...

Jolek, I have had an opportunity to look more closely at the alarm photo you attached to your original post. What seems to have caused the trip is the loss of liquid fuel trip oil pressure, but without being able to see the CSP running in the Mark V it's very difficult to say why that should...

Dude, I think we've been through this "dance" before with you. It's called "20 Questions" to try to understand what it is you are asking about--and while I know English is probably not your native tongue, you seem to be reasonably proficient at it (at least in writing). Think about how you...

Jolek, I have been ruminating on this thread and the information provided. It’s entirely difficult to understand how all three TCEA cards can freeze at the same time. Unless there was some kind of 125 VDC power supply problem which affects all three TCEAs. I don’t recall seeing all thre TCEA...

While they aren’t exactly the same thing, the terms are often used interchangeably. An axial compressor is a pretty unique machine in the realm of high-speed rotating equipment and compressors (such as centrifugal and reciprocating compressors). Axial compressors have very different...

Jolek, While it is true the stop valve solenoids are connected to <P>, I think you are ascribing entirely all too much responsibility to the TCEAs in the <P> core. To my knowledge, the <P> core of a GE-design heavy duty gas turbine consists of three TECA cards (Loc's. 1, -3 & -5), a TCEB (I...

Yes; I understand so well how high wheelspace temperatures become the controls guy’s (non)responsibility—as if the Mark* controls air flow to the wheelspaces. The Mark* does not—for anyone reading this and thinking it does. Just because the high wheelspace temperature alarms come up on the...

topcat123, I can only answer the BOM Group question. In the Parts List section of the Operation & Maintenance Manuals there is usually a set of parts lists (8-1/2”x11” or A4 size sheets with only letters and numbers) which lists the part number, brief description and quantity of each item...

Dustin, Great news!!! Thanks for the update!

Robin Enderby, I think you can post that your company offers a service in response to a request for parts/service; it's just posting a "new" thread offering your company's services (and parts) without any request that is considered to be a commercial post--which is not welcome here. And, yes...

Sorry; I have no experience with trying to use a version 07 dongle on version 04. I DO know it doesn't work the other way (v 04 won't work on v 07). And, thanks for making it's own unique thread! Perhaps @ME42 or @demigrog2 will write in to provide clarity or the answer you seek.