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Ratcheting for warmup? Ratcheting prior to a start only serves to raise lube oil temperature—not machine temperature. Ratcheting (Cooldown) prior to STARTing is used to help remove any bowing or sagging of the axial compressor rotor which may have occurred since the unit was last on Cooldown...

Pre-start ratcheting time. Is a function of how long the unit has been at zero speed. If the unit was shut down normally and was on Cooldown (ratchet) at least until the highest wheelspace temperature was less than approximately 100 deg C before being taken off Cooldown, and the time at zero...

glenmorangie’s answer is spot on. A local, qualified diesel service facility can give you recommendations, quotes and provide service. The normal reciprocating, Diesel engine maintenance is always necessary—regular oil and oil filter changes (based on hours of operation); air filter changes...

KunalKumar, This topic has been covered before on Control.com. There is a ‘Search’ box at the top of every Control.com webpage. As many people call the same “feature” by something a little different, searching may not always immediately turn up relevant results. But, don’t give up. The...

Abdulaziz, What is the frequency of the grid the unit is being synchronized to at the time this problem is occurring? Is it a large grid, or a small grid? What governor mode is the unit operating in at the time of synchronization? (Isochronous or Droop Speed Control?) What fuel is being...

Phil Corso, Rizwan Siddiqui is referring to the hydraulic pumps which supply pressure/flow to operate the stop and control valves. Usually, for a steam turbine, the hydraulic fluid is NOT mineral oil-based, but is some type of fire-resistant formula (because a leak of mineral oil-based...

shimat2, You can attach a photo or a .pdf to threads/replies in Control.com. Again, when something like this happens to a machine that was working, one should always ask: "What has changed?" Was some work done on the Generator Protection/Control panel? Was the generator breaker removed and...

shimat2, There should be a synchronizing display on the operator interface (you didn't say if you were using an <I> (running IDOS) or a GE Mark V HMI (running MS-Windows and CIMPLICITY). On the synch display there should be a few little squares in a vertical line (it's usually on the left side...

Majj_23, If you want the best help with your issue you would do well to clearly and concisely explain what you are trying to accomplish (not just the desired flow-rate--but what the expected temperature- and pressure ranges for the application are). It has been said many times before on...

Excellent ideas—all! But if you “ … can’t get access to the PLC … “ )and you didn’t say for how long you wouldn’t have access ….) then you have to improvise, and sometimes that means a little more “effort” than usual. Blessed day.

Use a mA simulator set for 10 mA. Some multimeters have this capability. You will need to know if the PLC provides the power for the loop or if the level sensor provides the power to choose the correct “simulator” function (usually referred to as “simulate” and “source”, respectively).

ControlsGuy25, I was so hoping to learn a lot from the article--but it contains too much maths for me to be useful (in explaining what happens in a generator). When a gas turbine is driving a generator it's usually a synchronous generator. And a synchronous generator is designed to produce...

ME42, This is the crux of the issue here: The original poster--as MOST Mark VIe operators and technicians--ignore alarms (Process and Diagnostic). So, the 'A' and 'K' status indications won't go away until the alarm is acknowledged and it is resolved and probably cleared from the WorkstationST...

Abdul majid bakti, We are very happy to hear the problem has been resolved, and we are very grateful for the feedback. Early Mark V turbine control panels did not have as many cables labeled as later panels do; that could be part of the problem with the IONET cables in the <P> core. Anyway...

Syed Ahmed, You wrote: “…Lets say the machine is at bseload now frequency decreases. The governor is already wide opened. So mass flow cannot be increase. Now the additional MW will come from the stored rotational energy hence rpm drops MW increases …” This is the problem—there will be no...

mahad83, What value other than “True” or “False” would you suggest is possible for ANY logic signal? It’s typically not common practice to use the _ALM signal (contact) in any rung for any purpose OTHER THAN annunciating an alarm. For start-check- and trip rungs/logic it’s good programming...

Syed Ahmed, There are many differences in operation between Part load and Base Load. Usually,at Part Load the IGVs are not fully open and the air flow through the machine is not at rated. At this point it’s mostly producing power—at rated speed—from fuel. When the unit in the...

Syed Ahmed, In my example, the machine was rated at 20 MW—so it was operating at 50% of rated. When the extra load was sensed because the speed decreased that changed the error between the speed reference (which DIDN’T change!) and the actual speed (which DID change). The error wasn’t enough to...

Curious_One, You are curious; that’s for certain, I never recall GE charging for this service. (Most people who commit the mis-steps leading to over-writing Totalizer data do so with good intentions, but are poorly informed and most are just flailing, to be perfectly honest. Compiling and...

Yes, GE Salem did invent a way to fix these kinds of … mis-steps. BUT, they only a couple copies of the software tool to make the changes to the Totalizer data file out of the factory. It was reported several years ago that someone had done something similar, but it was also reported that it...