EMR-5000
IM02602012E
If the VT measurement location is not at the bus bar side but at the output side, the following
has to be taken into account.
When disconnecting the line, it has to be ensured by an
»External Blocking« that
undervoltage tripping cannot happen. In order to block the 27M element in case that the
breaker is open:
Assign the »
Bkr.POS OPEN«
signal to a blocking input (»ExBlo1« or »ExBlo2« within
the Global Parameters) of the
27M
element,
and
»ExBlo Fc« has to be set to “active” within the parameter sets of the the
27M
element.
When the auxiliary voltage is switched on and the measuring voltage has not yet been
applied, undervoltage tripping has to be prevented by an
»External Blocking«. Otherwise a
continuous tripping would occur, disabling the ability to energize again.
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