Recent content by CSA

Yes. 1-2% difference would be pretty ideal. Do you have any data from the Mark* V for FSRs at FSNL and at similar loads? Because a 7% difference at FSNL is rather large—and an FSR2 of 11% at FSNL is rather low. Also, an FSNL of 44.8% at Base Load is pretty low. Most Mark* control systems are...

Okay; I'll lead off here (and probably wish I hadn't). I went to a US maritime academy and received a Bachelor of Science degree in Marine Engineering Technology, and a Third Engineer's License, All Engines-Unlimited Horsepower, from the US Coast Guard. Unfortunately, when I graduated there were...

tidjani, Also, the human machine operators have to be capable of responding to situations like this. Relying on automation to react to every possible problem means human operators are not necessary…. Hopefully machine damage was avoided in this case because alert human operators were aware of...

tidjani, As the oil level drops in the tank the main and auxiliary lube oil pump discharge pressure will fall, and the unit will (eventually) trip on low-low lube oil pressure. The emergency lube oil pump suction is usually at a lower level in the tank so it will provide oil flow to the...

Radio silence. Must have been a wiring problem. :cool:

Elwan, Thereis a procedure for using the LCC/SLCC keypad and display for determining the I/O States of the various I/O cards associated with <C> core. Write down the card names and I/O State values as you scroll through them after the trip (you may try before the trip, as well). That will help...

Many newer versions of ToolboxST have the feature that pops up 'Help' information for Diagnostic Alarms when they are double-clicked on. The SAME information for any Diagnostic Alarm is also found--usually--in GEH-6721, Vol. II, 'The Mark VIe System Guide.' One scrolls to the relevant section...

mahad83, This keeps pointing to some wiring problem. If you've replaced the PTCC AND the STCC and the problem persists, then it's likely NOT inside the Mark VIe panel. (And, it's possible that if it's a wiring problem outside the Mark VIe panel that the PTCC and/or the STCC is being damaged by...

mahad83, I was SO happy to see a photo of Diagnostic Alarms I completely forgot to ask: When did this issue with the T/Cs start? This is a very important question, and the forgotten tidbit about jumpering the T/C signals to the DCS just shouts, What else don't we know? Why aren't you using...

mahad83, Take a picture of the T/C values from the Thermocouples tab of the same PTCC I/O pack you took the photo of the Diag Alarms from and post it to this thread. How long have you been jumpering the signals to the DCS??? What happens to the Diagnostic Alarms when you disconnect the T/Cs...

mahad83, I'm impressed you took a photo of the Diagnostic Alarms for the PTCC...! Have you tried doing any of the recommended troubleshooting for the alarms? If so, what were the results? (Or, did you just go straight to replacing the I/O Pack and terminal board(s))? What happens when you...

nikidi.control, Have you tried looking at the Item Help or Block Help for the block that generates the L86TFB logic signal? If so, what did you discover? Without actually being able to see the block generating L86TFB in the Mark* at your site, we can’t say anything more with any degree of...

In my experience the servo valve coil resistance can be derived from Ohm’s Law. The maximum current passing through a coil should be plus-or-minus 10 mA (between positive and negative 10 mA). This should yield voltages between +10 VDC and-10 VDC. This means the coil resistance should be...

Upongabasi Akpabio, The Diagnostic Alarms seem to be saying the LVDT feedback from the two LVDTs (which should be nearly identical) is not similar, and the typical difference between the two feedbacks that causes this alarm is 5 DGA (DeGrees Angle). You should be able to use the Prevote Data...