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L14HR, when a logic "1", means that the turbine shaft is "at Rest", or, at zero speed. "Pickup" is another term for TRUE or logic "1". "Dropout" is another term for FALSE or logic "0". So, when TNH is less than TNK14HR1, L14HR becomes a logic "1", or "picks up". When TNH is greater than...

Okay, so the SRV was replaced and the problem started at that time. And seems to have gotten worse over time (can you confirm or clarify that, please?). I do think the servo-valve coil resistances are a little on the high side, about 10% too high. Most Moog servo-valves have coil resistances...

Uch. Or is it oUch? (the 'o' is silent) I've seen it expressed both ways. Now there's a site name that brings a shudder to many, many, many people. (I think I can hear otised echoing the same thought.) Have you asked GE this same question? If so, what was their response? We do not know the...

First of all, why can't they be calibrated on a periodic basis? What prevents their calibration? Access? Instrumentation? Knowledge or experience? Isn't this the real problem: The fact that they are "critical" to the process and can trip the process or machine should make them high-priority for...

The most important question is: What changed before this problem started? Was there some kind of maintenance outage? Was LVDT feedback "re-calibrated"? Was there some kind of forced outage, such as from a lightning strike or severe ground? Was the SRV servo-valve replaced? Were downloads and...

This type of switch is commonly used for this same type of application. The switch is a very "crude" device, but very adequate for the application. It's primarily intended to provide an indication or to stop the motor driving the fan blades if there is some large imbalance in the fan, such as if...

A lot of things to respond to here. And a lot of things which weren't mentioned. Proper operation of servo-valves and their actuators requires design hydraulic pressure, properly charged and operating accumulator, clean filters (main hydraulic filter and "last-chance" servo/actuator filters)...

G.Rajesh, Remember, some of the first combustion (gas) turbines were used as engines for aircraft and speed of rotation wasn't as important as it is for power generation applications. We're talking here about heavy duty gas turbines, which are primarily used for power generation applications...

A Google search for "VS94 Vibration Switch" yielded this: http://www.fwmurphy.co.uk/products/vib_time_speed/vibration_switch_vs94.htm Clicking on the 'Installation Instructions' link halfway down the page yielded: http://www.fwmurphy.com/uploaded/documents/pdfs/00-02-0185.pdf The...

Contrary to popular belief, UPS output can be quite noisy. Bad filter capacitors and internal switching issues can cause the output to be very bad. A UPS is not a power filter and can actually make line problems worse.

You're very welcome, and thank you for the feedback! LK90SPMN is a minimum limit on the setpoint of LK90SPIN. (LK90SPMX is a maximum limit.) LK90SPMN serves as a lower limit for stable operation. If you find that unit operation is not stable below a certain value, you can set the minimum...

I'm nervous about replying to this one because I don't know the turbine (heavy duty or aero-derivative) and I'm not clear about the term "initial load". For most GE-design heavy duty gas turbines using Mark Vs with autosynchronization done using the capability of the Mark V there is something...

> I really don't know what is the use of drain tube if the engine exhaust should be free from condensates? < One of the exhaust products of an internal combustion engine is water vapor. When an internal combustion engine is started from a cold condition, it's quite common to see water...

If the only thing done was to install a new driver on the CPU being used for the HMI Viewer for an LCD monitor, that should not have affected CIMPLICITY's connection to the HMI Server. That's done over an Ethernet connection, usually referred to as the PDH (Plant Data Highway). Have you...

Actually, I mis-spoke. My what a difference a letter can make; sorry, I haven't worked on a Mark V in a couple of years and I forget some things. T<b><i>B</b></i>QB is an analog I/O terminal board, on <R> processor. If the panel is a TMR panel, there are cables from the terminal board to...

The primary advantage of GE Mark V HMIs running MS-Windows and CIMPLICITY is that they are capable of multi-tasking. You can run multiple (two or three) command-prompt windows with VIEW tools running in them simultaneously, gathering data for troubleshooting. They are MS-Windows based, so making...

Are you using a twisted, shielded pair for your sensor signal wiring (presuming it's a two-wire circuit)? If so, is the shield drain wire grounded at <b>ONE</b> end <b>only</b>? It doesn't make any difference which end it's grounded at, but "convention" is that it be grounded at the power...

The IMD Department? ? You should have received a Control Specification drawing with the Mark IV Migration for your Frame <b>6</b> machine (Frame sizes are NOT expressed as Roman numerals like Speedtronic panel generations are). The Control Specification, in one of the last sections (Section...

Please, can you tell us about the turbine(s) at your site and the control system(s)? What fuel is being burned? Do you have high-speed trends or data to support your statement? Data that includes FSRN (Speed Control FSR), FSRT (Temp Control FSR), CSGV (Actual IGV Angle), TTXM (Actual Exhaust...

In both examples, the "Q" stands for a collective <R>, <S>, and <T> for a TMR Mark V Speedtronic turbine control panel. If the Mark V panel is a SIMPLEX panel, it refers to <R>. The TBQB card is an optional analog I/O card used in all the control processor(s) in a Mark V Speedtronic turbine...