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One should check in the operational annunciations that the VT mcb trip was detected. A requirement for this is
that the auxiliary contact of the VT mcb is connected and correspondingly allocated.
Close the VT mcb again: The above annunciations appear under the "going" operational annunciations, i.e. with
the comment "OFF" (e.g. ">L1 MCB Closed" " "OFF").
If one of the indications does not appear, check the connection and allocation of these signals.
If the "ON" and "OFF" messages are exchanged, then the breaker auxiliary contact type should be checked and
corrected if necessary.
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
Mounting And Commissioning
3.2 Checking Connection
83
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