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ashiq, Without a P&ID to understand where the pressure taps for the instrumentation is installed it's very difficult to comment on what's happening. If you want to confirm a differential pressure reading, it's very simple. You can make a water-tube manometer and connect it in parallel with...

Ayman, First, I'm not writing this just to/for you, Ayman. Many people read these threads, so I'm putting a lot of information here. And, I want people (you included) to think <b>SYSTEM</b>. The Speedtronic monitors and controls SYSTEMS. Everything in the system has to be working properly for...

Thank you for the update! 'Feedback is the most important contribution!'(c) here at control.com; it's what makes these threads useful for many years after the original problem was resolved. I'm presuming the "false LED" indication is at the ELIN module output.... I have seen some Mark VI...

Ayman, You didn't tell us if this is the first time these units have been run on liquid fuel, or if the unit has previously run on liquid fuel but hasn't run on liquid fuel for some time. From the information provided, it would seem one or both of two possibilities might be causing the...

G.Rajesh, Can you provide some update about the servo-valve test kit your site was purchasing and going to use to test the many servos which had been replaced?

A synchronous generator supplying a load, by definition, is "pushing" active power out of the machine to supply the load requirements. From a generator perspective, a leading power factor means--and I'm gonna take a hit for using this terminology, but, here goes--reactive "power" is "flowing...

MIKEVI, When a GE-design heavy duty gas turbine is operating at Base Load without any special "grid code" sequencing (which is optional and not typically provided on most machines) if the grid frequency increases the gas turbine power output will also increase. That's because the air flow...

To add to this, and to build on my earlier recommendation of jumpering the Elin relay output terminals while watching the L27BN logic in Toolbox, there could be a problem with the discrete (contact) input point or module, also. Though there would likely be a Diagnostic Alarm to that effect...

What does GE say about this? Have you checked the GE TILs (Technical Information Letters) and PSBs (Product Service Bulletins) for any information about this? I believe there was some write-up in the last couple of years about problems with Compact Flash cards. I don't recall if it was a...

Doubts.... Oh, how I dislike that word. (Look it up, and I think you'll see why. If you have questions, or need more clarification, that's great. But to doubt what you've been told, that's not so great.) > 1-for finite sys increasing excitation can produce VARs or only voltage will increase...

Mashll, Your situation is "hopeless", per your description. The situation is this: As the grid frequency goes up and down, so will the speed of your turbines--because speed is directly proportional to frequency. There is no change that can be made to alter the direct relationship between...

Ekemini, Thanks for the feedback. It would certainly seem the problem is with the L27BN input to the Mark VI. Again, that input is usually not inverted, and should be closed when the bus voltage is "Normal", and open when the bus voltage is abnormal. (Most Speedtronic logic signal names...

sd, No.

I want to add that when the turbine is shut down it's common for the current through the IGV servo to be a large negative number. This is because the position reference is usually greater than the actual position when the turbine is shut down, so the Speedtronic will be putting out a large...

When the turbine is shut down and there are no active trips in the turbine control panel, the current flowing through the servo coils should be a relatively large positive value. Positive servo current is used to shut off the flow of fuel or air or steam through the servo-operated device...

This topic has been covered many times on control.com. GE generally follows the ANSI device numbering scheme, and typically uses two alpha characters after the device number to denote the system and/or some condition. For example, a 26 device is a temperature switch. Device 26QT-1 is a Lube...

In order to be able to help you, we would need to know a lot more about the flame scanners in question. Who is the manufacturer? What is the application (boiler; combustion turbine)? What kind of problem are you experiencing with flame scanners that makes you want to know more about how...

L27BN is typically a non-inverted ("normal") discrete (contact) input to the Speedtronic. The device output contacts should be closed when the relay senses a proper level of bus (running) voltage available to synchronize to/with. Presuming your Mark VI uses 125 VDC for discrete input wetting...

Kamel, Have you monitored/trended speed/frequency versus load on your unit yet? What have you observed happening to speed and frequency when you change load (by changing fuel flow-rate)? If your 9FA has an EX2000 or an EX2100, you should also be able to trend excitation current and...

I'm going to take exception to the statement that all permissives are met. L83AS is just about <b>the</b> most important permissive. It's basically the permissive that's set when the operator selects AUTO synch. Have you used Toolbox to determine why L83AS isn't picked up? L27BN is...