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The general Droop speed control formula is: Energy flow-rate into prime mover = ((prime mover speed reference - prime mover actual speed) * Gain) + Offset The Offset is the amount of energy required just to achieve and maintain rated speed when the unit is un-synchronized. If it takes four...

Thanks VERY MUCH for the feedback! And, congratulations on successfully switching VPROs on-line! It's not exactly clear which alarms are Process Alarms and which are Diagnostic Alarms (I presume 5 is a Process Alarm, and 4 & 6 are Diagnostic Alarms). And, I believe the alarms are pointing...

Thanks for the feedback; but it's incomplete. It can only be: 1) A bad prox (proximity) probe (which you have eliminated) 2) A bad prox cable, between the prox probe and the proximitor (including too tight of a bend radius where the cable connects to either the prox probe or the...

Mohamedibr752, From my first response to this post, if the inlet filter differential is allowed to get too high bad things can happen. If the unit has implosion doors the implosion doors will open--which will allow unfiltered air to enter the axial compressor. (Limit switches should either...

SAK, Well, ..., er, ..., uh, ..., I wouldn't use the same term to describe different things. The difference between the speed reference (if you want to call it 'droop compensation', more power to you) and the actual speed is the speed error. It shouldn't be called anything else (in my...

There is no single document to match part numbers with ML (or MLI) numbers.

It's really very simple--it's a purchased option in most cases. If the buyer wants it, it is included in the purchase price. In a very few cases, the type of airborne contaminants in the location where the unit(s) will be installed will not lend themselves to being easily removed from the...

Have you checked the three-wire, twisted, shield cable used to connect the proximitor to the monitor? Especially the shield drain wire to make sure it is grounded at one end only (by convention, at the monitor end)? Please write back to let us know what you discover!

SAK, I do not remember ever referring to "droop compensation." When a new and clean machine operating at rated ambient conditions with 4% droop [regulation] <b>synchronized</b> to a well-regulated grid it will be at full load when when the speed reference is at 104%. If that same unit is...

dear hamid_hkh13, If there is only one Diagnostic Alarm associated with a single TCDA card, it's highly unlikely that changing PROMs will solve the problem. If the Diagnostic Alarm is just for a single input on a single TCDA card, it's most likely a problem with the &#8220;channel&#8221; on...

The hydraulic ratchet pump motor is usually a DC motor, and the speed of the DC motor is proportional to the pump discharge pressure. There is often some kind of slide/wire resistor or potentiometer in the ratchet pump motor starter which can be used to adjust the current applied to the motor's...

EXCELLENT question for GE's PAC (Power Answer Center). If you operate an F-class machine, you likely have access to the PAC. I believe if you ground the primary VT windings you will essentially be grounding the generator windings.... Please write back to let us know what you discover.

careeroperator/Richard, Is there a reason you are specifically asking about CPD? Are there CPD-related Diagnostic Alarms? Does CPD seem to be abnormally high or low for the current ambient and machine conditions? Have the emissions changed recently, requiring a re-tune, or a liner...

Kwaku, When did this problem start? After a maintenance outage? After a plant blackout? Have you checked the pump suction strainers to see if they are clear or clogged (choked)? When the pump trips, what is the condition that is tripping the pump? Overcurrent? Underfrequency...

Rotimi88, The GE heavy duty gas turbine controls community here on control.com has been pretty active for many years, and a prior contributor, markvguy, helped a lot in the beginning. glenmorangie, otised, MIKEVI, and many others have also been very instrumental in keeping the community...

Mac, The large companies you mention usually sell their hardware/software through companies, many of which are what's called 'system integrators.' These system integrators do the footwork of finding applications for the programmable logic controllers and often incorporate many other...

The 'etr' in L4ertn_fb refers to the Emergency Trip Relays on the TREG card, which are controlled by the VPRO cards. It would appear that for some reason, the ETRs for <Z> are dropping out and then resetting. If the Mark VI is a TMR control system, the usual conditions which will cause the...

khoriwal000, The only sources of water moisture in the axial compressor discharge are: --humidity (including fog) and rain (which may be ingested through broken filter elements or leaky inlet filter house structure joints/seams) --evaporative cooling (which affects humidity) --leaks...

muhammadusman, >What is a difference between governor position control, >power control and ISOCH mode? These terms aren't particular to hydro turbine controls--they are generally applicable to most generator-drive prime mover control systems (also called 'governors'). Generator-drive...

Hello, The hydraulic pump itself is usually identical to the one used for the Accessory Gear-driven Main Hydraulic Pump. And you will need an AC motor to drive the pump; there is probably already a place to mount the AC motor-drive (Auxiliary) Hydraulic pump on the top of the L.O. Tank...