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The above diagnostic alarm 'TCE1 TMR check trouble, ETR2' is appearing in the MKV panel when the unit is running. When checked in the logic forcing page by entering the signal L4ETR2, it was found “1” for all the processors, whereas the above signal in the prevote data display page is showing ‘1’ for <R> and <S> processor and ‘0’ for <T> processor.

Can anyone explain this discrepancy between the logic forcing page and the prevote data display page for the above signal L4ETR2 and also the reason for the above alarm?

Prevote data displays the data from each core. Logic forcing displays post vote data. The reason a diagnostic alarm exists is that T core believes that the value is 0 while R and S believes that a 1 exists.

Since TCEA is involved, ie Protective core, I would check to ensure that Z agrees with X and Y.

Just in case you have not consulted your manuals, R,S, and T have counterparts in P core named X, Y, and Z.

Thanks for your reply, the above alarm was rectified after changing the TCEA card of the <S> core instead of the <T> core TCEA card even though the mismatch in the signal L4ETR2 is shown in the <T> core in the prevote data display.

What could be the reason for the above diagnostic alarm related to the <T> core to vanish after changing the TCEA card in the <S> core?

I would use the PD core to remove power from each TCEA core ie X, Y, and Z and observe R, S, and T to ensure that some cabling might not be an issue.

By the way (and sorry I forgot to commend you!), thanks for the feedback!

Brian,

This "feature" was documented in one of GE's internal Mark V newsletters. It doesn't make any sense, but replacing the card that is indicated as having the problem does not always resolve the problem; replacing one of the other two TCEAs will generally resolve the problem.

To my knowledge, this is the only occurrence of this "feature" in the Mark V.

Thanks once again to all in control.com.

Is it possible to get a copy of all the newsletters that GE has released for MKV, MKIV and MKVI to update my knowledge?

Any information for the above would be greatly appreciated.

Thanks,

Brian