10 Trip Circuit Supervision (TCS) in E devices
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S
OFTWARE APPLICATION
3
Software application
3.1 Binary inputs
The
TCS input is active if the trip circuit is intact
, so the logical
‘0’ or FALSE signal of the input
means that either the trip circuit is broken, or it connects to high resistance.
The TCS signals are shown the same way as other binary inputs are in the device: they can be
seen in the
on-line data
menu on the local HMI or the device web page, and they can be utilized
just like any other binary input when editing the device configuration with EuroCAP software.
The names/titles of the inputs follow the occupied slot of the TRIP module (if it is in Slot
N
, the
TCS contact is named BIn_
N
##).
3.2 The TCS macro
In most cases the trip circuit is tripped along with the circuit breaker as well. In situations like this
the TCS input would signal a broken trip circuit (
logical ‘0’ or FALSE) unnecessarily. To avoid this,
the status signals of the CB are to be used combined with the TCS input signal so that it will be
evaluated only when the CB is closed.
The TCS macro incorporates this logic for two separate TCS inputs for one CB (see Figure 3-2
for the two TCS inputs and the CB status signal inputs). The outputs are the failure signals for
each connected TCS input.
Figure 3-1 Graphic appearance of the Trip Circuit Supervision macro
The internal logic of the macro can be seen on Figure 3-2 below. Both outputs have a fixed pick
delay of 1000 ms. Note that
here the outputs are active if the trip circuit is broken
. For a CB
with only 1 trip circuit it is enough to simply leave the
TCS2
input open (naturally in this case the
TC_Failure2 output cannot be used).
Figure 3-2 Internal logic of the Trip Circuit Supervision macro