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MJ, You can't go wrong with JFB's advice and procedure. We are basically in agreement: the charge pressure <i>when there's NO hydraulic pressure</i> should be approximately one half of rated system hydraulic pressure. I've seen as high as two-thirds of rated hydraulic system pressure(which is...

Batman, Can you provide a link to the comment so I can build on the information for the explanation?

any author, The first question is: What does the OEM (Original Equipment Manufacturer: Ansaldo) say about the problem? The second question is: Has the OEM made any recommendations or suggestions (other that what you've described)? The third question is: Have you implemented any...

N.V.Q, Here's a logic diagram for the TIMER_SEC block which might help:<pre> 1 -------------------------- - - - log_in | 0---------- 1 ------------- - - - log_out <--pu_del-->|...

Batman, I don't think we know when 30SG-1 changes state, actually. We don't know if it changes state when the input to 95SG is energized and both outputs are energized, or if it changes state when the input to 95SG is energized and at least one of the outputs is NOT energized. My suggestion...

N.V.Q, <b>PULSE</b> block. No Block Help for this block either, eh? Very bad GE. When the TRIG input logic goes to a logic "1" the logic output OUT will go to a logic "1" for the period specified by the WIDTH (usually expressed in thousandths of a second; a value of 6000 would represent...

N.V.Q, I refer you to the first response: "When the log_in (logic input) is true (logic "1"; energized; picked-up) for the specified period of time on the pu_del input <b>the log_out (logic output) will be a logic "1" and will remain a logic "1" as long as the log_in remains a logic...

Batman, 30SG-1 "drives" l30sg1. You should think of it like this:<pre> NORMAL (Non-Inverted) Discrete Input to Digital Speedtronic Turbine Control Panel Hardware | Software -------- | -------- | Physical...

Actually, I'm <b>not</b> done with this thread. This issue started back in December of 2013 with this thread: http://www.control.com/thread/1386045425 And then it became this thread: http://www.control.com/thread/1400902483 And, now it's morphed into this present thread. So, since...

Batman, This is an all-too-common alarm and problem, and may involve ... <b><i>inversion masking.</i></b> The high-energy ignitor power source, 95SG (there's usually only one of these ignitor power supplies, which drives two (2) ignitors ("spark plugs")) has a discrete (contact) output...

N.V.Q, In the case you described, this is a timer block, with a pick-up delay (time delay to energize, or time delay to pick up). When the log_in (logic input) is true (logic "1"; energized; picked-up) for the specified period of time on the pu_del input the log_out (logic output) will be...

Shimy, Good question, and welcome to the discussion. In the beginning, it was intended that the groups be of like conditions, but over the years that has ceased to be the case. And, in some cases, some conditions would not fit into a group with any other condition. Which would mean a lot more...

Hello, Ruiyu Chen, We don't know what kind of turbine-generator you are talking about. My answer presumes a GE-design heavy duty gas turbine generator. There should be P&IDs provided with any GE-design heavy duty gas turbine generator which would show the presence--not the exact location...

SB, Thanks for helping explain. I've been experiencing some problems with posts recently, and I was waiting for Neo to respond, but, I see now my most recent submission didn't get to the Kind, Friendly Moderator. My bad for not checking; sorry. Neo, Let's have a very close look at...

abdi, There is no written documentation that details what you are looking for. What I know I've learned from working on these units for a couple of decades, working with combustion- and design engineers, observing the evolution of DLN-I technology over the years, understanding how turbines...

Meganathan S, The turbine and auxiliary packager (GE or BHEL or ???) should have provided a P&ID for the compartment ventilation systems, and on that drawing there are maximum values for pressure drops in duct work. Typically the drawing is called, "Flow - Heating and Ventilation." It may...

abdi, As many manufacturers do, they use logic/sequencing in many different applications. Simply because the logic exists does not mean it should be forced ON or OFF. The fact there is no operator-selectable ON/OFF capability should speak volumes for the intent of the operation of the...

abdi, We want to know how you think IGV Exhaust Temperature Control and IBH are related--because they are not. [NOTE: IGV position and IBH are related, but IGV Exhaust Temperature Control and IBH <b>are not</b> related.] It's not clear what you mean by "no control loop for IBH"--do you mean...

Yassar, One of the better manuals produced by GE, the Mark VIe System Guide, GEH-6721, has some very useful information about the hardware of the Mark VIe and how it interfaces and works with inputs and outputs (I/O). Check the PTCC section ('P' for IO<b>P</b>ack; 'TC' for...

fluidflow, Yes; it's unfortunate that too many plants do not allow interested parties to open Toolbox (or ToolboxST) and poke around and learn. Many sites mark a Toolbox (or ToolboxST) file as 'Read-only' which makes making unintentional changes impossible. Combined with proper password...