Siemens 6MD85, Manual

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Figure 7-5 Configuration of the External Start of the 3-Pole Circuit-Breaker Failure Protection Function
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Figure 7-6 Configuration of the External Start of the 1/3-Pole Circuit-Breaker Failure Protection Function
In 1-channel operation, the start for the 3-pole circuit breaker is initiated with the binary input signal
>Start
only.
In 1-channel operation, the start for the 1/3-pole circuit breaker is initiated for 1-pole tripping with the binary
input signals
>Start pole A
,
>Start pole B
, or
>Start pole C
only. In the case of 3-pole tripping,
the start is initiated with the input signal
>Start 3-pole
only.
In 2-channel operation, the binary input signal
>Release
(or for the 1/3-pole circuit breaker
>Release 1-
pole
in the case of the 1-pole start and
>Release 3-pole
in the case of the 3-pole start) must also be acti-
vated to initiate the start. In the default setting, the starting signal drops out immediately when the input
signals have a falling edge. If necessary, the starting signal can be held. In this case the start remains active
when the binary input signals have a falling edge.
The input signals are monitored to avoid an unwanted pickup of the function.
If either of the signals
>Start
or
>Release
is active for more than the set supervision time without the func-
tion picking up, an error in the binary input circuit is assumed. The corresponding signal is blocked to exclude
an external pickup of the function. An indication to this effect is output, and the Health signal changes to the
state
Warning
. The blocking is reset as soon as the binary input signal drops out.
Supervision is disabled in the following cases:
•
On pickup of the Circuit-breaker failure protection function (only in the case of an external start). This
prevents an unwanted pickup of the supervision if the external protection that starts the Circuit-breaker
failure protection function uses a lockout functionality. When the starting signal drops out, the supervi-
sion is enabled again.
•
As long as the function or the device is in test mode. This allows to check the function without the super-
vision blocking the function.
Protection and Automation Functions
7.1 Circuit-Breaker Failure Protection
SIPROTEC 5, High-Voltage Bay Controller, Manual 519
C53000-G5040-C015-9, Edition 11.2017