Recent content by MARKlaneV

  1. M

    FPRG_INT voter mismatch on MarkV

    Thanks, We have noticed on runtime Prevote Data; <T> core FPG2 value 2-3% low <T> core FPRG_INT a couple % higher The <T> core FPG2 transmitter has had a "drifty" zero. We plan to replace it and check calibrations.
  2. M

    FPRG_INT voter mismatch on MarkV

    One of our MarkV’s is getting intermittent voter mismatch alarms for <T> FPRG_INT. Has anyone had this before? What was the solution? I can see FPRG_INT in the ladder logic rungs. It is described as an "orphan signal" with no clue where it comes from or how it is calculated. It appears to be...
  3. M

    Fault 125VDC ground MarkVie

    I had an experience where a ground fault wasn't found despite meticulously isolating all of the inputs. It turned out that our Reuter-Stokes flame scanners run on 125VDC on another circuit. Ours had fuse so isolating as a group was easy. Once we saw the ground fault go away, we went scanner...
  4. M

    Persistant voter mismatch alarms

    Problem resolved!!! I want to thank all of you for your ideas / questions / suggestions. It was external to the Mark V. There was a hard ground fault on the positive side of our high yard 125VDC system. The Mark V alarms were a symptom of stray and "un-seeable" dithering. We found the that...
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    Persistant voter mismatch alarms

    Thanks CSA, MODE SELECT is OFF, but switched to AUTO for starting/running. CONTROL LOCATION is in REMOTE. CABLE REMOTE is ENABLED. This for a sister plant to dial in and start the units in our absence, and for AGC control via our dispatchers. Almost all of the commands that they can send...
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    Persistant voter mismatch alarms

    Curious One & HamsterKing, Thanks for the ideas. It will take me some time to digest and then research them. Unfortunately, I am stuck as Control Room operator today (all 8 are running this morning). On shutdown last night, the voter matches resumed. I was not here for the start-up to try...
  7. M

    Persistant voter mismatch alarms

    we have 4 GSU's Each is shared by 2 units. There are now 2 GSU's with 1 affected unit and 1 non-affected unit.
  8. M

    Persistant voter mismatch alarms

    I have hard rebooted all 3 TCEA boards via <P> core switches. Nothing changed.
  9. M

    Persistant voter mismatch alarms

    #1. I really appreciate you all taking the time to puzzle over this with me and give ideas. Update: We shut down 4 of our units. All were ones that had recurring mismatches. 3 of them resumed the mismatch symptoms. 1 of them did not!! Of the 4 units that are still running now, 3 of them...
  10. M

    Persistant voter mismatch alarms

    By, the way we are in a cornfield about 100 miles due West of Chicago.
  11. M

    Persistant voter mismatch alarms

    After printing out all alarms several Master Resets were done. This includes the L86MR_TCEA. Same symptoms persist. All Mark V cores were rebooted (R,S,T,X,Y,Z,C) simultaneously. While they were powered off the HMI computer was rebooted. Same symptoms persist. The unaffected unit was the 1st...
  12. M

    Persistant voter mismatch alarms

    Thanks for helping James. All 8 units have open 52G breakers. The 128VDC between pins 36 and 37 on PTBA board is stable. Of course, there are multiple breaker status switches, but a continuity test on the OTBA 36 & 37 wires show an open condition. We have not been able to test...
  13. M

    Persistant voter mismatch alarms

    I made a couple of typos. SSDIFF1(phase) values toggle between 180deg and 0deg. SSDIFF1(slip) should have been SFDIFF1(slip) on Variable Names T6.D_3450_C, T6.D_3691_C, and T6.D_3932_C. These are toggling between 128% and 0%, and ARE causing voter mismatches.
  14. M

    Persistant voter mismatch alarms

    Hello, We have eight 2000 vintage frame 7EA with DLN1 and MarkV control system and EX2000 exciter. When we came onsite this morning, 7 of the 8 units were displaying the following alarms (these are from our Unit 6); Description - Variable Name Voter mismatch, <R> SSDIFF1 -...
  15. M

    Auto Synch capability difference between Black Start and Non-Black Start units

    This question is on behalf of my Plant Manager, and is directed to any 7EA plants with MK V that has had GE modify your controls for black start operation. Our site has 8 units, 4 are black start capable and 4 are not. We have what I think is a curious side effect on the 4 units with the...
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