Search results

>This assuming that you have IGV Temp. Control on. If IGVs >are fully open, bleed valves closed and no bleed heat, you >will still get the same effect. What do think causes it >then? I think changing axial compressor discharge pressure is also a function of fuel flow and combustion. As...

shahabas, >The IGV opening is proportional to the load requirement. if >the load increases the the opening of igv increases, that's >why the compressor discharge pressure increases (air flow to >compressor increases). IGVs are modulated for various reasons--NONE of them are directly...

Esoteric_Stone, Thanks for the information; again, I won't be at a Mark VIe site for a month or more, so this is helpful. >Spot on. It is pressure control loop. Only regulator used is >Position Control. I have only one confusion though. If >pressure control can be done in application...

rizwanhaide, I have not found a solution to this problem. I would recommend contacting the manufacturer of the ARCnet products GE uses to see if they have something (an NIC and a driver for the VM you are using). Contemporary Controls www.ccontrols.com Please let us know what you...

>the snark VIe Now THERE'S a Freudian typographical error if there ever was one. One has to really appreciate spell checkers! Sometimes, that is. ;-)

rizwanhaider, Most companies will not allow their software to be shared on a World Wide Web forum. You are right, though, if the original posters needs help with something and can describe the problem he can probably get some help here, but there don't seem to be many people with a lot of...

Well .... I believe if you look in the application code of the snark VIe you will see the SRV is still a pressure control loop, and the servo regulator is where the LVDT feedback is performed. So, in essence, it's still a pressure control loop with LVDT feedback; just like in the Mark V,. The...

IconPhaby, By the way, this is the second time an alarm with a '$' prefix has been posted to control.com. I personally have never seen such an alarm before. I'm continuing to look into this, but I suspect this is something that has changed with a new HMI upgrade. Or, possibly, with a new...

gbuendia, Thanks very much for the feedback! It is much appreciated!

deepakkumar03, There is some very good information about flow-testing of nozzles provided in the responses above. You do not really "calibrate" fuel nozzles. All you do is test the flow-rate through the assembled fuel nozzle (liquid side and gas side) and note the flow-rate. You want to...

SANJAY MALLIK, So, this may be part of your issue. MANY people credit the Mark* for doing more than it actually does. If you think the Mark* opens the jaw clutch when the turbine is self-sustaining you would be thinking wrong. As described before, when the speed of the turbine side of the...

SANJAY MALLIK, I want to be perfectly clear. IF the jaw clutch is in fact disengaging before L14HA goes to logic “1” the reason is most likely either: 1) there is insufficient torque being developed by the diesel, OR 2) there is insufficient torque being transmitted by...

SANJAY MALLIK, >But the starting device trip happens at around 2200 rpm >before self sustaining speed achieve by the turbine.What we >have observe is before turbine self sustaining speed achieve >the jaw clutch get disengaged and thus turbine tripped.Now >is that diesel torque problem or...

2250 RPM is approximately 45% speed. If the jaw clutch is opening (L33CSE goes to logic "0") before L14HA picks up then L3SMT is going to pick up and trip the turbine. I think I made a typographical error for the typical value if TNK14HA1 (the value of TNH at which L14HA goes to logic "1"). I...

Esoteric _Stone, >it is very difficult to convince the people that >although MarkV is annuciating alarm but it is not the >culprit. Yes, operators and their managers, mechanical department personnel and Plant Managers will always insist the ground simply MUST BE and CAN ONLY BE on a...

Esoteric _Stone, You wrote: >If L14HA is NOT picked up i.e. "1", then either L3SMTX must >be "1" or BOTH L4DE AND L33CSE must be "0". Because L4DE and L33CSE are in parallel, if EITHER L4DE >>OR<< L33CSE are Logic "0" >>OR<< L3SMTX is a logic "1" AND L14HA is a logic "0" then L3SMT...

Esoteric_Stone, I really only see one question, about ground in 125 VDC SOV (Solenoid-Operated Valve circuits (including the solenoid). My experience with grounds in solenoid circuits is that a ground in the circuit on either side of the solenoid will result in a 125 VDC Battery Ground alarm...

IconPhaby, How is the troubleshooting progressing?

RJ_VR, Making changes to the application code of a Mark VIe is not for the faint of heart--or even for those with a high tolerance for risk. I understand the desire (or need) to automate canceling Pre-Selected Load Control when the desired set-point is reached (to prevent operators from...

J, You've been given some good advice and troubleshooting techniques. 3300 RPM is approximately 92% TNH (speed), so you're looking for something that has 125 VDC connected to it (a solenoid-operated valve (SOV)) or some kind of switch (limit switch; level switch; etc.) that is changing...