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Apparatus control
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Supervision of abnormal status between the select and execute signals. If select is
given for one direction, it must be followed by execute for both directions. Or, if the
other principle is used, both selection inputs are followed by execute for the desired
direction.
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The control part should check the start conditions (for example, if there is a select for
open when the position is open) for a valid selection, the movement itself, and correct
completion. The corresponding status signals are given. The operation depends on the
interlocking and blocking signals.
The supervision of the command output is made by the microcontroller on the output
board.
A timer supervises the start of the drive. If the drive does not succeed in starting within
a specified time, the command sequence resets, and an error indication is generated.
A timer supervises the movement of the drive. The maximum time can be set between
the start and until the new position is reached.
When three phase indications are included, the pole-discordance function is included.
If interlocking allows operation, the drive can be operated when the starting-point is in
the intermediate position.
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Synchrocheck conditions can be considered when manually closing a breaker. The
closing command is released via the apparatus control, as for ordinary operations with
the synchrocheck function excluded.
A timer supervises the synchrocheck function. If the conditions are not fulfilled within
a specified time (after a closing command is given), there is a failed synchronization.
The control terminal can use a built-in synchrocheck function (also called internal syn-
chrocheck ) or use an external synchrocheck or synchronizing equipment, which are
separate devices outside the control terminal. Two solutions are supported. The explicit
closing command can come from the apparatus control itself (activated by the synchro-
check) or from the external synchrocheck equipment (activated by the apparatus con-
trol).
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