•
Device Status Check (set = actual): The switching command is rejected, and an error indication is
displayed if the circuit breaker is already in the set position. (If this check is enabled, then it works
whether interlocking, e.g. zone controlled, is activated or deactivated.) This condition is checked in both
interlocked and non-interlocked status modes.
•
System Interlocking: To check the power system interlocking, a local command is transmitted to the
central unit with Switching Authority = LOCAL. A switching device that is subject to system interlocking
cannot be switched by DIGSI.
•
Zone Controlled / Bay Interlocking: Logic links in the device which were created via CFC are interrogated
and considered during interlocked switching.
•
Blocking by Protection: Switch-ON commands are rejected with interlocked switches, as soon as one of
the protection functions of the unit has opened a fault case. The OPEN-command, by contrast, can
always be executed. Please be aware, activation of thermal overload protection elements or sensitive
ground fault detection can create and maintain a fault condition status, and can therefore block CLOSE
commands.
If the interlocking is removed, consider that, on the other hand, the restart inhibit for motors will not
automatically reject a CLOSE command to the motor. Therefore, a restart inhibit must be provided by
other means, e.g. by a bay interlocking using CFC.
•
Double Operation Block: Parallel switching operations are interlocked against one another; while one
command is processed, a second cannot be carried out.
•
Switching Authority LOCAL: A control command from the user interface of the device (command with
command source LOCAL) is only allowed if the Key Switch (for devices without key switch via configura-
tion) is set to LOCAL.
•
Switching Authority DIGSI: Switching commands that are issued locally or remotely via DIGSI (command
with command source DIGSI) are only allowed if remote control is admissible for the device (by key
switch or configuration). If a DIGSI-PC communicates with the device, it deposits here its virtual device
number (VD). Only commands with this VD (when Switching Authority = REMOTE) will be accepted by
the device. Remote switching commands will be rejected.
•
Switching Authority REMOTE: A remote control command (command with command source REMOTE) is
only allowed if the Key Switch (for devices without key switch via configuration) is set to REMOTE.
Functions
2.18 Breaker Control
SIPROTEC 4, 7SJ61, Manual 223
C53000-G1140-C210-6, Edition 05.2016
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