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Transporter, Something else you should have noticed is that when this problem occurs, the 4T relay LED is not lit. This is all to be expected when <T> is trying to trip the turbine for some reason. As be_anon has suggested, you may be able to use information from the Trip Display (Data...

I presume by '90 degree branch' you are referring to a tee connector that in intended to split the fluid flow between two sets of water-to-air heat exchangers (radiators). I repeat probably the single most important question when troubleshooting any problem: <b>WHEN DID THIS PROBLEM...

> ....the speed continue to increase till overspeed trip. at the same time I used > the Manual FSR control to bring down the speed and to avoid the over frequency [sic] trip. It's not clear if the unit tripped on overspeed (it wouldn't trip on over-frequency if the generator breaker were...

Phil Corso, This application is for powering a synchronous machine as a motor to start a gas turbine. When the unit reaches approximately 95% of synchronous speed (approximately 2850 RPM), it is "switched" to a synchronous generator and the gas turbine drives the generator to produce...

Tom, I believe the primary purpose of baffling in the exhaust is for sound attenuation (deadening), not so much to provide back-pressure for the turbine. I believe higher back-pressures (such as those experienced with HRSGs ("boilers") on the exhaust, or very tall exhaust stacks, or very long...

Michael, Depending on the type of control system used for your GE-design Frame 6B, there are ways to "work backwards" from a particular alarm message to find out what is causing the alarm. If you could tell us what kind of control system the turbine uses we might be able to tell you how to...

Chandru, Doubts are not something we like to deal with here at control.com. These are great questions for designers of electrical/electronic equipment. Many times the choice to use one type of equipment over another is based on designs currently being used or which have been proven to be...

Hello, Mark V, I have a question. <b>When did this problem start?</b> After someone ran the Total Job Compiler on the operator interface and downloaded to the Mark V and re-booted the operator HMI? After someone tried to edit a MODBUS list or a GSM list or a CIMPLICITY display or project...

Sadiya, Have you tried swapping one of the other vibration sensors with the suspect one (at the Mark VI terminal board) to see if the problem stays with the sensor or is with the terminal board, or possibly the cable(s) connecting the terminal board to the Mark VI processor rack(s), or with...

Tom, I want to qualify what I'm about to say by saying that you are working on a Frame 7FA, and F-class units are much "finicky" about exhaust duct back-pressure and inlet differential pressure and many other things which other GE-design heavy duty gas turbines aren't so affected by...

Transporter, The Diagnostic Alarm drop numbers are not important. It's the Process Alarm Drop Numbers from the Auxiliary Display for <T> that are important. And, it's NOT always the first alarm in the list that is the cause of the problem. In some cases it depends on when the problem is...

You didn't tell us if the operator interface is an <I> or a GE Mark V HMI running MS-Windows and CIMPLICITY. Do you know how to use the Dynamic Rung Display and/or do you have a printed copy of the CSP and the CSP Cross-Reference? If you also told us what Frame size machine you are working...

Transporter, When this occurs, you need to review all of the Diagnostic Alarms and you will likely find the "culprit." Or, and this is a long shot, you can use the Auxiliary Display to review the (Process) Alarm Drop numbers of <T> to see what caused <T> processor to think the turbine...

ashiq, If a transmitter was calibrated for, say 0-30 mmHg for 4-20 mA, that would be the same as 0-39.99671 mbar for 4-20 mA. I have seen people use "scales"/engineering units to calibrate a device that were different than those used to display the value on the screen of some operator...

This is good information. I don't know if www.wikipedia.org is available in your part of the world, but it is an excellent resource for many questions. AC is used for electric power systems primarily because the voltage of the power being transmitted over wires can be increased and...

sridhar, What is it about High Voltage generators that you want to understand? What do you consider High Voltage? 440 VAC? 11,500 VAC? Do you need to understand how generators work? Or is it just synchronous generators you need help understanding? Do you need to understand why AC...

Sadiya, Thanks for the feedback! Can you tell us something about the problem(s) you are experiencing and why you are checking the vibration sensor and the Mark VI input? Was the Mark VI provided with the unit at original installation, or is it a retrofit of an older control system on an...

Murali, We would need a lot more information to be of help with your inquiry. First, when did this problem start? What kind of combustion system (conventional or DLN)? If the unit has conventional combustors, is IGV (Exhaust) Temperature Control active ("combined cycle" mode)? At...

Trip generally refers to an unplanned, uncontrolled, "emergency" shutdown of a machine or process or piece of equipment. For example, if an excessive high vibration is detected on a piece of rotating equipment, it's customary to "trip" that piece of equipment by immediately interrupting or...

Thank you, be_anon, Although the Mark VI COMPare blocks can do greater than and less than and greater than or equal to and less than or equal to, because early COMPare functions in Mark IV and Mark V could only do greater than, GE did a lot of "inverting" of comparisons in Mark VI--just to be...