Hi Mark V experts,

I need some guide in understanding diagnostic alarm which messages were come out from Mark V when unit was shutdown, as shown as following:<pre>
Core Alarm ID Message
T QD 1708 TCE1 Loopback, relay, PTR1
T QD 1355 TCQA PTR2 relay driver RD3 failure
T QD 1354 TCQA PTR1 relay driver RD2 failure
T QD 1251 TCQA 4-20mA output disagrees w/ref CH.B
T QD 1196 TCQB Prox. 29 position out of limits
T QD 1709 TCE1 Loopback, relay, PTR2
S QD 1708 TCE1 Loopback, relay, PTR1
S QD 1355 TCQA PTR2 relay driver RD3 failure
S QD 1354 TCQA PTR1 relay driver RD2 failure
S QD 1251 TCQA 4-20mA output disagrees w/ref CH.B
S QD 1196 TCQB Prox. 29 position out of limits
R QD 1709 TCE1 Loopback, relay, PTR2
R QD 1708 TCE1 Loopback, relay, PTR1
R QD 1355 TCQA PTR2 relay driver RD3 failure
R QD 1354 TCQA PTR1 relay driver RD2 failure
R QD 1251 TCQA 4-20mA output disagrees w/ref CH.B
R QD 1249 TCQA 4-20mA indiv. current high CH.B
R QD 1196 TCQB Prox. 29 position out of limits</pre>
So where do I start? How this alarm is generated? Is it showing something?

Thank you for your help in advance.

Unit background:
GE Steam Turbine -- 66MW
Mark V HMI

 

The usual question first, has any work been done on this machine recently? Firstly take the Prox 29 alarms out of the picture, that looks like a separate issue.

Let's take all the PTR1/2 issues, this all coming from the <P> core X,Y & Z (TCE1)cards, or looks like it. Check all the ribbon cables from R, S &T TCQA to <P> core. Check power supplies to <P> are all OK to the TCEA cards and particularly to the TCTG (Loc 4) card. If you have a spare TCTG card, try it.Let's see where that gets us. The 4-20mA output looks like a separate issue as well. Do you have a MKV Application Manual, if yes have a look at the signal flow diagrams in Appendix D for the 4-20 Ma outputs.

The Prox 29 alarms look like a prox. probe not being set up properly.