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nomolos, You're very welcome! It would be great to know what you find in your research about manual and automatic Droop/Isochronous selection/transfer on your machine!

I'm all for finding a way to help the original poster with his problem. I don't have access to the Mark VIe .tcw file from the site, and we only have the information he and Adeel have provided. I am more than a little concerned about the number of thumbs-down responses to the posts here; it...

nomolos, There was a time when GE-design heavy duty gas turbine control used Isochronous speed control mode during synchronization (FSNL operation), and then was switched to Droop speed control mode when the generator breaker was closed (this was also common for many older GE steam turbine...

In my experience, it doesn't take much to break the LP shaft away from zero speed and accelerate it--as long as the torque/load on the LP shaft isn't excessive. It would seem you have proved the same with your testing. I maintain--if the machine has been working for decades with similar...

Haroon, It's impossible for me to understand what's occurring without actionable data (trends recorded during the failed LP breakaway). As such, I'm extremely hesitant to recommend changing any parameter. If the speed pick-ups checked out okay (and we don't know how they were checked...

Haroon, What were <b>ALL</b> the Process- and Diagnostic Alarms which were present during the start and when the LP shaft did not break away? Did anyone actually observe if the LP shaft rotated during the start attempt? Have you checked to see if there is something that is causing the...

The three processors could have been called anything: 1, 2, 3; A, B, C; X, Y, Z; P1, P2, P3. I think the designers tried to find a logical order of letters/symbols,characters that was simple and somewhat unique yet logical and non-confusing. They did use the 'carets' (< & >) to enclose the...

jk47ii, Thanks VERY MUCH for the feedback!

Fifty7Chevy, The definition of Base Load (primary- (CPR-biased) or secondary exhaust temperature control) is when the IGVs are full open (at their maximum operating angle, CSKGVMAX) <b>AND</b> the actual exhaust temperature (TTXM) equals the exhaust temperature control reference (TTRX)...

Fifty7Chevy, Is that a two-door, Bel Air, four-door, pick-up or Cameo? Has the unit been running properly before this outage? Does the load seem to be higher than normal? What is the load when FSR gets to 100%? What are the gas control and SRV positions when FSR gets to 100%? (I'm...

Older Laurence/Leslie solenoids WERE polarity sensitive; the newer ones with the electronic module are not. Unfortunately, on the older, polarity sensitive solenoids both coil leads were black, and there was a small red sleeve placed on one of the black leads to indicate it was the positive...

Askic, You are using Mark VI and Mark VIe interchangeably; they are two separate, but somewhat similar, control systems. They share some I/O terminal boards but the Mark VI is physically much larger than the Mark VIe. Both systems were developed to be able to have remote I/O--that is, to...

Jolek, One more thing--you mentioned that when you applied a frequency to the third mag pick-up input that nothing happened. The majority of Mark V turbine control systems which used liquid fuel had 77FD-1 connected to <R> QTBA-55 & -56 (Q_Q_MPU3--which is the third magnetic speed pick-up...

Mohamedibr752, Thanks very much for the feedback! Glad to hear things worked out!

Jolek, Thanks very much for the feedback! A servo is NOT a servo, as you have found out. Lube oil quality is the single most contributor to servo longevity--or, said in other words, poor lube oil quality is the number one cause of servo failures. AND, refineries have improved turbine lube...

sridhar, When did this problem start? Had the module been working for some time previously and then just stopped working? Did some event (trip) occur just prior to the start of the problem? Many times there are other permissive or conditions which must be satisfied before the...

Saul, It would be extremely helpful if you provided information about the manufacturer and madel of the excitation system in question. Is it possible that the configuration for the VAr signal is inverted? (I'm presuming the AVR has software-configurable parameters--but without knowing...

JamesU, One of the supporters (advertisers) of control.com, Gas Turbine Controls, sells new and refurbished Speedtronic and Mark* printed circuit cards, and cables, and other parts for Speedtronic and Mark* turbine control systems. Their URL is: www.gasturbinecontrols.com.

The pins and receptacles of the ribbon cables of EX hardware are prone to corrosion. Each spare card usually came with a tube of conductive grease to apply to the female side of the connector--a little goes a LONG way--before inserting the connector into the receptacle with the male pins. If the...

khoriwal000, Apparently, I didn't properly understand the TLA (Three-Letter Acronym) MOT, mistaking it for the Mist (Eliminator) Oil Tank. A long run of tubing can adversely affect the reading of a gauge, especially when we're taking about very low pressures/vacuum readings. Losses in the...