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My question is, what caused the site to change servos? Was there already unstable operation with the original servo? Or was the instability caused or made worse with the new servo was installed?

rvs_gasturbine, Recently I have been to two sites with diesel starters where the units either didn't break away from zero speed or had problems during acceleration resulting in very high exhaust temperatures (because the control system was putting in a LOT of fuel trying to help with...

rvs_gasturbine, So, both of the #2 bearing T/Cs are not working correctly. This is very odd. As with the bearing drain T/C, typically the T/Cs embedded in bearings are also dual element T/Cs. Have you tried reconnecting the interconnecting wires to the spare element of the two bearing T/Cs...

soyxan, The general practice is not to run AC and low-level DC (usually defined as less than 50 VDC) in the same conduit, but like everything in life there are very few hard and fast rules. The real problem arises when there is high current flowing in either circuit, and particularly if that...

siddiqui, Have you tried right-clicking on the block in ToolboxST and then clicking on 'Block Help'? That should bring up a Help screen with information about the block and it's inputs, outputs and operation. Most blocks are "illustrated" in relay ladder diagram format, so if one is...

bahindra75, Yes; we kind of got side-tracked on this one.... I believe most of the questions were originally answered in one of the responses below. If you still have questions or need clarification, please post them here or in a new thread and we'll try to answer them. Perhaps one of...

Jolek, When did this problem occur? Did it start after a maintenance outage? Did it start after a trip from load? How often does the unit operate on liquid fuel? What kind of liquid fuel is being burned when this problem occurs? I agree with glenmorangie, the problem could be a...

Hi, Belal_Mahdi, GE and its packagers have used a modified version of the ANSI Device Numbering system for the devices used on a heavy duty gas turbine. This system uses a one- or two-character device number for different types of sensors; a 26 device is a temperature-sensing device; a 63...

rvs_gasturbine, Your post is unclear; specifically this sentence: > Apart from this the metal bearing temperature probes of turbine > journal bearing -2 is out. What are you trying to say about the #2 bearing metal temperature values? Are they "normal"? Are they abnormal? If they are...

ibr2016, Without more information, we can't comment on the gas fuel purge/vent valve. As for the cranking motor, I suspect it's not really running--meaning that it's not getting voltage/current at it's terminal from the mains high voltage supply. More likely there is some condition in the...

ibr2016, How fast is the cranking motor spinning? Rated Speed? What is the state of L52CR when the unit is at FSNL? Which purge vent solenoid are you talking about? 20VG-1? If it's 20VG-1, why would you think 20VG-1 should be closed when the unit is starting or operating on liquid fuel?

fnc, Thanks VERY MUCH for the feedback!

dannys, >please, I need full and detail explanation and the name of >field devices connected to the following Mark VI Terminal >Board. > >1. VCRC (48 contact input, 24 relay outputs). > >2. TRLY (6 solenoid outputs) > >3. VTUR (4 speed pick ups) and lots more...

Forgot to add the equalize function/mode is usually selected by a switch on the battery charger. Again, it should only be enabled/used when the Mark VI is NOT energized. What is the 125 VDC at the Mark VI <PD> input terminals (without the AC being applied)? What is the nominal battery...

khoriwal000, Try this (found using "battery charger equalize mode"): http://batteryuniversity.com/learn/article/equalizing_charge

khoriwal000, Try this (found using Braden "Self-cleaning Filter"): http://www.braden.com/pages.aspx?pageid=42 It's just a reaction to the release of pressurized air in a venturi when there is a flow of air through the venturi inducing a reverse flow that knocks the dirt off the outside...

Hi, We can't help you unless you provide <b>ALL</b> the Process- and Diagnostic Alarms that are present before the START or fuel transfer AND during the transfer before and after the trip. The most likely cause are failed/faulty check valves--both liquid fuel and purge air check valves...

Apyx4869, The hydraulic pumps are positive displacement, axial piston pumps (each with a swash plate and a pressure compensator). The flow-rate through the hydraulic system defines the angle of the swash plate, which increases or decreases the piston stroke as require to maintain pressure as...

igvman, Thank you very much for the feedback!

igvman, I've seen sites where NTP was installed when it should not have been (sometimes, it's installed automatically from one of the GE software distribution disks). And, I believe that even if it's installed correctly it won't make HUGE jumps (like eight hours) when the time discrepancy is...