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Kevin, As I've said, I'm not really an expert by any stretch of the imagination on all the "background" stuff for HMIs. While it can be a real struggle to get all the communications between HMIs and Mark VIs/Mark VIes working correctly, when it does work it works very well. I've been to quite...

Batman, I likely didn't address your explanation of what's happening--but it's basically correct. 1) L4 must go to a logic "1" in order to start the turbine, and it must remain a logic "1" in order to keep fuel flowing to the turbine once flame is established. 2) When the unit is at...

SSV, The process is that when TTRF1 drops below the Premix-to-Lean-Lean transfer point drop-out temperature the ignitors ("spark plugs") are energized for a short period of time, and the gas fuel splitter valve moves from its Premix fuel split position (usually approximately 80% primary) to...

Lucky, I would imagine the turbines at your site have DLN-I combustors, because that's usually the only reason for heating natural gas--to prevent condensation of natural gas liquids which can lead to primary zone re-ignitions which means emissions can't be minimized because the turbine won't...

saha, Please follow the CQTC signal from the input to the FSRSUV1 block back to where it is calculated and I believe you will find that it a value that is derived from the axial compressor <i>inlet</i> temperature, not from the axial compressor discharge temperature. If I recall correctly...

Batman, L4Y is used in other rungs, not just L4S. The reason there is a timer at all is to prevent what's called a "relay race" during very "busy" times when L4 is changing state from "1" to "0". I honestly don't know why it's set for 1.0 seconds, but I know it works. And I know that...

Nguyen Thanh Son, The Mark VI turbine control panel broadcasts alarms and events on the UDH. In the case of a GE Mark VI HMI, TCI (the GE proprietary MS-Windows service that runs on the HMI) is responsible for "picking-up" the broadcast alarms and events, displaying them to the Alarm...

Ali, Thanks very much for the feedback! Also, congratulations on finding the problem!

H.A.R., There have been sites that have successfully used some additional tubing sections and fittings to reconnect the Hydraulic Ratchet pump to supply oil to the hydraulic oil system for stroking ("calibrating") LVDTs. I don't personally recommend doing so, as many Hydraulic Ratchet pumps...

Neo, I think it will be best if we examine most every trip condition--not all of them--but probably most of them. They are very useful in understanding what conditions lead to a turbine trip from the controllers (<R>, <S> and <T>). You are avoiding answering the question about why you...

Neo, Here are the kind of questions one should ask after a careful reading of the original post: When was the control system upgraded to Mark V? When did this problem start? After a maintenance outage? After a trip from load? What Process Alarms are active during starting? What...

Batman, Good on you for expanding your knowledge; it's very helpful for mechanical engineers to understand how turbines operate, too, not just to know how to turn a wrench or orient an orifice plate. I believe you found a typographical error in my post (something I had just chided Neo for...

Nguyen Thanh Son, I forgot a simple "test": Have you used the 'Print a Test Page' feature of the Alarm Logger printer properties of MS-Windows to see if it can print a test page?

Ramana, There is a lot of good and applicable information in the previous posts to this thread. Many times, manufacturers post a lot of very useful generic technical information about their products trying to demonstrate how theirs is better than others. Don't neglect such information...

Kevin, Welcome to the world of Speedtronic turbine control systems in the age of Mark VI and Mark VIe. Good on you for reading the available documentation as you begin your learning. It's not really clear what your job will be working with the Mark VI/Mark VIe.... 1) I'm not quite sure...

Neo, Let's back up just a minute, please, and explain why you wanted to remove L94SD from the L60RB rung. As for L4T--yes; it's much more involved as it has most of the critical protection for the turbine and auxiliaries in it, so it's going to take a while. That should be okay, though...

Nguyen Thanh Son, I thought I posted a detailed set of questions yesterday, but it seems to have gotten lost in the Great Bit Bucket of the ethos. This will be decidedly less detailed. If Process Alarms are visible in the CIMPLICITY Alarm Window, then alarms are being broadcast by the Mark...

Vimal Gupta, Yes; more information is required. Usually, it's necessary to ground one lead of the multimeter (set to AC) and then measure each of the DC leads with respect to ground. Only when the AC voltage is excessive will an AC voltage measurement from the positive DC lead to the...

Ali, Without being able to see the application code running in the Mark VI at your site, it's rather difficult to say with any certainty--but we can make some presumptions and point you in the proper direction to understand the difference. AFQD seems to be a measurement of axial compressor...

Neo, Thank you for the kind words. Yes; I agree with your sentence describing the L94T rung. 1) Yes; my comment refers to the L60RB. Remember, the comparator says if TNH <b>is greater than</b> than K60RB, then L600RB will be a logic "1". And, remember, we said that sometimes signal...