•
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
2.27 Breaker Control
358
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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