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Isulamu, The ((REF - FDBK) * gain + bias current) is all done in software, and if the feedback is less than the reference then the term will be positive (to increase the position), and if the feedback is more than the reference then the term will be negative (to decrease the position)...

VJ, A strainer is just to catch large debris before it gets to the pump portion of the torque converter. You should be able to go to the Accessory Compartment and find the strainer enclosure underneath the electric starting motor; it's probably about 25-35 cm tall and about 20-25 cm in...

VJ, The Auxiliary Hydraulic (Oil) Pump (AHOP) has been an option on GE-design Frame 5 heavy duty gas turbines for decades. Without an AHOP there is no back-up to the MHOP (Main Hydraulic (Oil) Pump). When there is no auxiliary hydraulic pump, generally the machine has to be CRANKed during...

yaseeeen, There is no such product as a Mark IVe; there is Mark IV and Mark IV Migration, but no Mark IVe. If a valve position reference is, say, 95%, and the valve can travel to 95% without hitting a mechanical stop or -limit, and the position feedback is approximately 95%, AND all of the...

se_Iain, I'm not familiar with Hitachi machines, but you seem to be saying that there is no Accessory Gear-driven Main Hydraulic Pump, only an AC motor-driven Hydraulic Pump? Is that correct? In GE-design non-F-class heavy duty gas turbine Mark VI application code, the AC motor-driven...

All of my experience with GE-design Frame 9E heavy duty gas turbines was with units which used a Voith torque converter. I don't recall any filter in the torque converter oil circuit--a strainer, yes, but no filter. What company manufactured the torque converter(s) used on the machines at your...

Jokek, The Process Alarm is exactly, 100% correct. When transferring from Premix to Lea-Lean during a shutdown the spark plugs have to fire to re-ignite the fuel in the Primary combustion zone. If they are not inserted at the proper depth <b>OR</b> they are worn (and the tips of the...

yaseeeen, +/-10 mA is a maximum range. The Mark V never really puts out more than approximately +/-8 mA, and that's called saturation current. If the Mark V is putting out saturation current then something is REALLY wrong because the device isn't moving and the feedback isn't anywhere close...

yaseeeen, If we're talking about an electro-hydraulic servo-valve such as the type used on GE-design heavy duty gas turbines, the sevo-valve coils are generally 1000 ohms (approximately), so 10 mA through 1000 ohms equals 10 volts. You can measure the voltage "being applied" to the coil with...

badr, Thank you very much for the quality feedback! It is very much appreciated. I would check with the vortex tube manufacturer about moisture condensation. If you're using instrument air, I would imagine it's already pretty dry (or should be!). I'm sure the manufacturer makes or sells or...

pjk, No generator protection will protect the machine on low gas fuel supply pressure--unless your unit is extremely non-standard. Possibly--<i>if the gas fuel supply pressure gets low enough for long enough</i>--reverse power will trip the machine, but you will see load decreasing as gas...

Daniel, Thanks you for the feedback; I'm glad to have been of help. GE-design heavy duty gas turbines don't use BPT (Blade Path Temperature) for control or monitoring, and I'm not really familiar with the concept. If you can tell us more about it, or if you can tell us which turbine you...

PJK, The low gas fuel supply pressure alarm is <i>generally</i> detected by a pressure switch, the setting of which is defined in the unit Device Summary drawing. Sometimes, a pressure transducer is used for the indication--and there have even been cases where both have been used for...

j. perez, Personally, I'm not familiar with a hydrogen seal vacuum pump. What kind of generator are you working on? Can you provide any more details? Do you have the P&ID for the hydrogen sealing system?

fnc, GSM (GE Standard Message Protocol) is a pretty simple system in that it's really just a list of Mark V CDB (Control Signal Database) signal names--no special addressing/referencing required (like with MODBUS). The GE Mark V HMI is a "slave" and the DCS is the "master" and the GE Mark V...

sanjib_dibrugarh, The first question to ask when a problem like this occurs is: When did this problem start? Was it after a maintenance outage, when the sensor(s) were removed? Was it after a maintenance outage, when the sensor(s) weren't removed but work took place in the area? Has...

Javali, Please have a re-read of both of your posts--there are some serious contradictions, as well as some difficult-to-understand statements. It's likely that English is not your first language and that accounts for some of the inconsistencies and choice of words. However, this is a...

Badr, Have you measured the air temperature entering the bottom of the control panel versus the compartment temperature versus the air temperature exiting the control panel? Is it possible that there's some issue with the air circulation outside of the control panel that's preventing...

Badr, I'm a little confused because you wrote earlier: "...the strange thing about those Ntron faulty switches is that they return to normal if we use them in other machines we have in our site (besides the three i mentioned, we have several other machines working with Mk VIe very...

Javali, There are more losses associated with operating at a reduced power factor. You also need to be cognizant of the generator's capability curve, sometimes called D-curve, or reactive capability curve. Your generator nameplate may provide more information--the VA rating is usually...