Manual MRR1 SEG Electronics GmbH
DOK-TD-MRR1, Rev. B 15
5.3 Blocking of protective functions and assignment of the
output relays
By pressing the <ENTER> and <TRIP> push buttons simultaneously the menu for blocking of pro-
tective functions and assignment of the output relays is activated. The assignments can either be
done by using the push buttons on the front plate or via serial interface RS485. The assignment
mode can be terminated at any time by pressing <SELECT/RESET> push button for some time
(3s).
5.3.1 Blocking of protective functions
After activating the menu for blocking of protective functions the following functions can be blocked
selectively:
Earth fault protection (warning)
Earth fault protection (trip)
Excitation undercurrent
Excitation over current
Rotating diode failure protection
By repeatedly pressing the <SELECT/RESET> push button, the functions to be blocked are
selected one after another. The corresponding LED lights up simultaneously. The display shows
"BLOC" or "NO_B". BLOC means this function is blocked, if auxiliary voltage is applied to the
external blocking input. NO_B means applying aux. volt-age to the external blocking input has no
influence on this protection function.
Blocking or not blocking a function can be selected with the push buttons <+> or < > and be stored
with <ENTER> after input of the password. Storage of the new setting to be done as shown in table
5.3.
Selection with push button
Table 5.4: Effect of the blocking input
With the default setting all functions shown in above table are blocked via input D8/E8.
After all functions have been displayed and push button <SELECT/RESET> has been pressed, the
relay switches over to the assignment mode of the output relays.
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