Markv SDCC Card Change

B

Thread Starter

Bayram

Hi all,

We have markv TMR using IDP program in frame6 units. Core <s> stopped on (Default system) and not reach A7. I changed the card, and it's reach A7. But the calibration value different from other <R, S> core, and GCV not open during firing. Please i want to know the procedure of changing this card.
 
Bayram,

I believe there is a procedure in the Mark V Maintenance Manual, GEH-5980.

You have to set the Berg (hardware) jumpers on the new card in the same positions as on the existing card.

Shut off the 125 VDC power to the core.

Then you have to remove the SLCC from the from of the SDCC card. When removing the cable between the SLCC and the SDCC you have to be very careful not to damage the connectors on the cable; it's easily damaged because there are no pull tabs on the cable.

Then you have to remove the SDCC card and put it on a non-static surface, and you have to remove the socketed PROM chips ONE AT A TIME and place them in the appropriate sockets in the proper orientation on the new card.

One of the tricks I use when swapping DCC/SDCC cards is to remove the U9 EEPROM chip (it does not have a label) from the existing card and put in in place of the U9 EEPROM on the new card. This precludes you from having the set the Voter ID and you also don't have to download anything to the new SDCC card, including the FORMAT command--because all of that information is contained in the old EEPROM, including the Totalizer (Timer and Counter) data.

Then you install the new SDCC card on the card carrier, and replace the SLCC card--again being careful not to damage the cable from the SLCC to the SDCC.

When you power-up the SDCC card, it should go immediately to A7, because you re-used the EEPROM chip with all of the configuration information.

What was the command you used to download to the EEPROM chip? If there is difference between the LVDT calibration constants of <S> and <R> & <T> it seems like there is a problem with I/O Configuration information that was downloaded to the EEPROM. Have you tried re-downloading the IOCFG partition to the EEPROM chip ion the new card?

The I/O Configuration that gets downloaded to the EEPROM chip are then loaded in the RAM of the cards associated with the processor every time the processor gets re-booted (or booted). The LVDT calibration I/O Configuration constants are copied by the TCQA card from the EEPROM chip into the TCQA RAM. This is the only relationship between the LVDT I/O Configuration and the SDCC card--the values stored in the IOCFG partition on the EEPROM chip.

One thing to know: If, during downloading of the EEPROM information to the EEPROM chip the processor suddenly goes to A7--it's a "false" A7. You still need to re-boot the processor (by removing the 125 VDC and then re-applying it after about 30 seconds) in order for all the EEPROM information to get fully loaded in RAM, as necessary.

When you downloaded the EEPROM information to the new EEPROM chip on the new SDCC, did you first download ONLY the FORMAT partition, then re-boot the <S> core? And, then download the USER partition to the EEPROM, and after it finishes downloading (and even if it goes to A7 during or shortly after the download) then you have to cycle the power to <S> core again in order to get all the information to all the cards from the EEPROM chip and to get to a real A7 state.

That's about it. It's not that difficult, especially if you transfer the U9 EEPROM chip from the old card to the new card.

Hope this helps!!!
 
Thanks too much

I took too much information from your reply. And i up load from <R> then down to <S> after formatting the <S>. Thank you
 
Is there any difference in replacing a SDCC board on the <C> core v?

We were getting D2 and D10 diagnostic alarms on <C> core with the turbine running. We decided to replace the board during an outage. We have three SDCC boards that we tried but each board was not recognized. Each of the boards was "recertified" by GE. The board read 00 when looked up on IO STATES. I have not yet tried replacing the U9 EEPROM chip. I will give that a try. We put the card that we originally took out and it came back up to A7. We have checked EEPROM pin insertion, berg jumper positions and cable connections. The instructions that come with the card give a description of how to replace it, GEI-100029C. The only idea I have left it to buy another board and try it.
 
I replaced the U9 EEPROM from the old to the new board and it worked. The card came up to A7. Following the instructions in the GEI-100029 manual, it does not say to replace the U9 chip in the PROCEDURE FOR REPLACING BOARDS section. It does in the REPLACING/INSERTING SOFTWARE section. I should have read all of the instructions before starting.
 
joe45678,

Hmmm.... That's interesting that swapping the U9 EEPROM chip is mentioned in any GE documentation. I'll have to try to obtain a copy of the GEI you mentioned.

I suspect the problem you were experiencing was that you hadn't used the LCC/SLCC keypad to tell the new card (with the "blank" EEPROM chip) which processor it was installed in. And, if it's in <C>, you also have to set the StageLink ID.

Once that's all done, then you have to format the EEPROM (after StageLink communications have been established--which shouldn't take more than setting the StageLink ID for <C>), then re-boot the processor (power cycle it), then download USER to the EEPROM, then power cycle the processor, and all should have been good.

BUT, the trick of swapping the U9 EEPROM chip saves a lot of that effort (as long as the U9 EEPROM chip is good--and I have seen them be the problem--but usually only when a LOT (a really, Really, REALLY LOT) of EEPROM downloads have been done. There is a limit to the number of times the EEPROM can be downloaded to, but it is usually high enough that for most sites with Mark V turbine control panels it will never be reached. But, there are some sites that watched OEM service personnel continually do downloads to try to solve any and every alarm or issue and they continued that (poor) practice and eventually hit the download limit (which is supposed to be about 10,000 downloads! but isn't quite that high in reality).

Anyway, THANKS VERY MUCH for the feedback! Now I have to go searching for a copy of that GEI.....
 
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