Search results

Is there a way to copy a trend from one unit to another? Or a way to export and modify in excel?

We do 2 tests without actually overspeeding the turbine. The first is for the Primary Overspeed system. We reduce the overspeed trip constant, start the unit. While the unit has flame and ramping, it trips at 25%. This proves the the trip will close gas valves. The second is to the Emergency...

We have seen faulty thermocouple, cables, cable connector ends/crimps, and terminations in the J box and in the Turbine Control Panel cause the same errors. Sometimes it is hard to identify the exact cause and we have had to replace parts and solve by process of elimination. But, the...

I may have added some confusion, I do that... The screen readings (TTXD1_nn) read lower than the input by 20 Deg F (at 1000.) I wrote that they were low by approximately (~) 20 Deg F, not negative (-) 20 Deg F. They were exactly 20 Deg F low, or .98 of the input (of 1000.) Yes, using the...

Just to share a bit more detail: There are differences in software (and hardware) between the 2 units. GT1 has the GE Opflex software with autotune, dynamics, and model based Ares software. The temperature coefficient, tkxcoef, is .9775. GT2, the unit I initially experienced the difference in...

It turns out that we were taking the readings from the HMI screen. There is a .98 coefficient from the input to the screen. The inputs were reading exactly 1000 Deg F and the screen was reading 980 Deg F. I did learn more about my system, how the cards are arranged, where to find some...

CSA, your reply does help. Thank you for all the support! There are no diagnostics on the MVRA (or in the Mark6e at all- which is nice.) This issue was discovered as part of scheduled testing. Unfortunately there is no known history of this check in the past so this may have been an issue...

Customer trips are any trip that comes from outside of the turbine control panel. At a combined cycle plant, customer trips can (and should) include low water levels in a boiler drum or high steam temps. Typically there is a screen on the Balance of Plant (BOP) DCS that will show what the...

Yes, the thrust bearing does the work of holding the turbine, compressor, and generator from chewing itself apart. The thrust bearing assembly and shaft thrust collar are a significant assembly! If you ever get the opportunity to see one apart, take it. Obviously these pieces were, indeed, sized...

You need more information, and you should understand how the DCS logic is set up, and does it match how the Rotork is set up. You need to understand why the remote indication is only on for a second. Look at the input on the DCS (wires 10-11 from the Rotork.) Is it just a pulse from the Rotork...

http://www.miinet.com/InterfaceSolutionDownloadCenter/Products.aspx?product=249 Moore THZ3 can take 2- 4-20ma and convert to Hart, then use a triloop. Also https://www.viatran.com/static/media/uploads/manuals/970_manual.pdf Viatran 970 pressure transmitter uses Hart. It looks like you...

How is the 3500 rack connected to the ST? Are you losing the signals from the field device to the rack or from the rack to the ST? Is there a network connection (ethernet) and the signals are Modbus? If so, there may be a network issue. A faulting switch or router or ethernet cable (or any fiber...

Mark5 Power Supply capacitors (like most electrolytic capacitors) are known to fail, and I have noticed a pitch change over the course of a year or so +/- on some prior to failure that I attributed to the capacitors failing. It could indeed just be a change in the way the inductors are...

We have the Mark6e migration from Mark5. This system uses all the Mark5 IO but changes the core processors out to the upgraded Ethernet connected version. We still have Arcnet to the Excitation system and an upgraded C core that has the Arcnet connection. Regarding the downloading online...

We recently converted from Mark5 to Mark6e. We had an existing link to Ovation already. Previous link was a modbus over ethernet. The MK6e is GE special using GSM code that Emerson has a driver for. So we had to change the Emerson configuration for the previous Mark5 link to Mark6e. If you do...