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Rishi Kumar Srivastava, Thank YOU for the feedback. "Feedback is the most important contribution!"(c) here at control.com. It's what makes this site so special and useful to so MANY people. I'm glad to hear you have been successful, and am keen to know how you resolve the voltage dip issue.

I'm extremely confused now. And I fear any comments I make are only going to make the problem worse. There is no mention of what was done to resolve the ratchet pump motor overload. If the unit is not ratcheting, it would seem the most likely cause is the hydraulic ratchet...

Mambo, There are just too many intangibles to say for certain why the TNR is so high. Inlet air filter cleanliness/differential pressure; IGV cleanliness; axial compressor cleanliness; exhaust duct back-pressure; turbine nozzle condition; turbine clearances; fuel characteristics (heating...

Mambo, No. Someone's been mucking with the Droop Constants, and/or the ambient is lower than normal. Have you checked the calculated TTRX versus the Control Constant values running in the Speedtronic turbine control panel? Inaccurate GCV LVDT calibration can also contribute to this problem.

Rokan Uddin, Have you used the 'Help' feature of ToolboxST, or looked this up in GEH-6721, the Mark VIe System Guide (usually in Volume II, in the PAIC section)? (The same information will be in both places.) I haven't encountered a Suicide Relay on an milliamp output before, but they are...

BrownBag, What kind of turbine (manufacturer, type of turbine, size of turbine, application (generator drive; compressor drive), number of extractions (steam turbine), condensing or back-pressure (steam turbine), etc.?

JP, <b>Something has changed</b> with regard to: --GCV LVDT calibration --P2 pressure transmitter calibration is off --Gas fuel nozzle orifice sizes --Atomizing air flow during start-up/firing/acceleration --Cross-fire tube issue between CC#3 and CC#4 or CC#5 --Axial...

abdi, What about the premix issue?

Troubleshooting is quite often a process of logical troubleshooting. It is logical to question the servo-valve and the actuator. However, if everything worked fine before the MI and during off-line testing after the MI, then it's likely to presume the problem is the actuator or some kind of...

Most thrust bearings are not journal-type bearings. They are "Kingsbury"-type thrust bearings. (Use your preferred Internet search application to look up this and various other types of thrust bearings.) Journal bearings can can have different temperatures because of the different loading...

<b>>>CORRECTION<<</b> The following statement is <b>INCORRECT:</b> >And, by recirculating a portion of the axial >compressor discharge it reduces the >"back-pressure" on the compressor, which >will increase CPD, but which doesn't >have much affect on performance when the >IGVs are not...

Good morning to you! The problem started after a Major Inspection "revision." What is a MI revision, please? Exactly what was done to the second stage nozzles/actuator during the MI? I don't recall if there is a "trip" solenoid/hydraulic trip relay valve in the second stage nozzle...

Tom Murphy, IBH is necessary if the IGV angle is less than approximately 57-62 DGA. It's necessary to protect the compressor against stall/surge when the IGVs are closed to less than compressor design minimum operating angle (which most F-class machines are during start-up and low load...

Ismayil, When did this problem start? After a maintenance outage? If so, what was done during the maintenance outage? You say the start-up failed. At what speed? Are you sure fuel was actually flowing? What fuel are you starting the gas turbine on? Do you know that the steam...

G.Rajesh, The purpose of the spring is to ensure the clutch halves disengage during acceleration when the turbine shaft speed over-runs the starting means speed--and that the clutch halves remain disengaged during normal operation.

G.Rajesh, If the jaw clutch halves remain engaged when Cooldown is selected OFF, that just means the jaw clutch teeth are in good condition--because that's all that's keeping them engaged against the opening spring pressure when 20CS-1 is de-energized. Whether or not they remain engaged...

Rishi Kumar Srivastava The problem may also be something is not right with the DC Emer. L.O. Pump motor.... How long has it been since the brushes were examined? Have you tried just running the DC Emer. L.O. Pump manually for a minute or so to see what the effects on the DC Battery...

eggplant, Drop-out-to-run ensures that when DC is lost to the Speedtronic turbine control panel that all motors deemed critical which are controlled by the Speedtronic and which have been configured using the drop-out-to-run philosophy will start and run. That's a LOT of motors to all be...

Rishi Kumar Srivastava "...we observed that some times malfunctioning in Mark VIe control system occur causing false alarms on screen...." If you would list all, or even some, of the "false alarms" we might be able to help you. The entire scenario you describe is VERY COMMON for...

bil07, The problem might be that you are mixing proximity probes (which usually have "X" and "Y" probes), and which may require scaling if buffered inputs are used from a Bently-Nevada monitor/rack, and seismic probes (which don't usually have "X" and "Y" probes, but quite frequently have...