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Hi!
I really appreciate for any opinion or possibility of solution for my below case on Mark-V TMR Gas Turbine Controller.
Phenomena : Unit trip on gas Fuel (loss of flame) during "R" Computer automatically reboot. while we already found cause of "R" computer automatically reboot but we still investigate fail of redundancy function due to suspected abnormality of "T" Computer.
To confirm TMR function we do reset/reboot on each computer during GT operation. When we do reset on "R" & "S" computer, GT was Trip. but when we do on "T" computer, GT was not Trip. From this investigation we suspect there is abnormality on "T" Computer.
Continue troubleshooting on "T" computer
1. "T" Computer display status "A7" (normal operating condition)
2. Diagnostic Alarm <pre>
Core "C" ==> Voter Mismatch <S> L4ETR1
Core R/S/T ==> TCE1 TMR check trouble , ETR1
Core "S" ==> TCE1 loopback, Relay ETR1
from this diagnostic alarm , direct us of "S/Y" ETR failure
(not match with the reset test result)</pre>
3. Investigate on Trip Log<pre>
L28FDC L28FDD DWATT L4ETR1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.4 1
11:03:21 AM 1 1 19.4 0
11:03:21 AM 1 1 19.4 0
11:03:21 AM 1 1 19.3 0
11:03:22 AM 1 1 18.8 0
11:03:22 AM 1 1 17.7 0
11:03:22 AM 1 1 15.7 0
11:03:22 AM 1 1 13.1 0
11:03:22 AM 1 1 10.2 0
11:03:22 AM 1 1 7 0
11:03:22 AM 1 1 4.1 0
11:03:23 AM 1 1 1.4 0
11:03:23 AM 1 1 -0.8 0
11:03:23 AM 1 1 -2.8 0
11:03:23 AM 1 0 -5.9 0</pre>
From this trip log, it shows that L4ETR1 Feedback change from 1 to 0, 2 sec before GT Trip by Loss of Flame.
4. Verify TCEA to TCTG Cable JL- JLX ,JL-JLY, JL-JLZ ==> No abnormality
5. Function test (Contact output check) TCTG relay K4, K5, K6 ==> Relay & contact are all good
6. Replace TCEA "Z" ==> Not solve
7. Replace TCEA "Y" ==> Not solve
8. Replace TCTG ==> Not solve
9. Replace TCQA ==> Not solve
Thanks for any Help.
Regards
I really appreciate for any opinion or possibility of solution for my below case on Mark-V TMR Gas Turbine Controller.
Phenomena : Unit trip on gas Fuel (loss of flame) during "R" Computer automatically reboot. while we already found cause of "R" computer automatically reboot but we still investigate fail of redundancy function due to suspected abnormality of "T" Computer.
To confirm TMR function we do reset/reboot on each computer during GT operation. When we do reset on "R" & "S" computer, GT was Trip. but when we do on "T" computer, GT was not Trip. From this investigation we suspect there is abnormality on "T" Computer.
Continue troubleshooting on "T" computer
1. "T" Computer display status "A7" (normal operating condition)
2. Diagnostic Alarm <pre>
Core "C" ==> Voter Mismatch <S> L4ETR1
Core R/S/T ==> TCE1 TMR check trouble , ETR1
Core "S" ==> TCE1 loopback, Relay ETR1
from this diagnostic alarm , direct us of "S/Y" ETR failure
(not match with the reset test result)</pre>
3. Investigate on Trip Log<pre>
L28FDC L28FDD DWATT L4ETR1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.5 1
11:03:21 AM 1 1 19.4 1
11:03:21 AM 1 1 19.4 0
11:03:21 AM 1 1 19.4 0
11:03:21 AM 1 1 19.3 0
11:03:22 AM 1 1 18.8 0
11:03:22 AM 1 1 17.7 0
11:03:22 AM 1 1 15.7 0
11:03:22 AM 1 1 13.1 0
11:03:22 AM 1 1 10.2 0
11:03:22 AM 1 1 7 0
11:03:22 AM 1 1 4.1 0
11:03:23 AM 1 1 1.4 0
11:03:23 AM 1 1 -0.8 0
11:03:23 AM 1 1 -2.8 0
11:03:23 AM 1 0 -5.9 0</pre>
From this trip log, it shows that L4ETR1 Feedback change from 1 to 0, 2 sec before GT Trip by Loss of Flame.
4. Verify TCEA to TCTG Cable JL- JLX ,JL-JLY, JL-JLZ ==> No abnormality
5. Function test (Contact output check) TCTG relay K4, K5, K6 ==> Relay & contact are all good
6. Replace TCEA "Z" ==> Not solve
7. Replace TCEA "Y" ==> Not solve
8. Replace TCTG ==> Not solve
9. Replace TCQA ==> Not solve
Thanks for any Help.
Regards