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command sequence is finished. If an error occurs in one of the steps in the command
sequence, the sequence is terminated. The last error (L_CAUSE) can be read from the
function block and used for example at commissioning.
There is no relation between the command direction and the actual
position. For example, if the switch is in close position it is possible to
execute a close command.
Before an execution command, an evaluation of the position is done. If the parameter
PosDependent
is true and the position is in intermediate state or in bad state no
execution command is sent. If the parameter is false the execution command is sent
independent of the position value.
Evaluation of position
The position output from the switches (SXCBR or SXSWI) is connected to the switch
controller SCSWI. The XPOS1, XPOS2 and XPOS3 input signals receive the
position, time stamps and quality attributes of the position which is used for further
evaluation.
In the case when there are three one-phase switches connected to the switch control
function, the switch control will "merge" the position of the three switches to the
resulting three-phase position. In the case when the position differ between the one-
phase switches, following principles will be applied:
All switches in open position:
switch control position = open
All switches in close position:
switch control position = close
One switch =open, two switches= close (or
inversely):
switch control position = intermediate
Any switch in intermediate position:
switch control position = intermediate
Any switch in bad state:
switch control position = bad state
The time stamp of the output three-phase position from switch control will have the
time stamp of the last changed phase when it reaches the end position. When it goes
to intermediate position or bad state, it will get the time stamp of the first changed
phase.
In addition, there is also the possibility that one of the one-phase switches will change
position at any time due to a trip. Such situation is here called pole discordance and is
supervised by this function. In case of a pole discordance situation, that is, the
positions of the one-phase switches are not equal positions for a time longer than the
setting
tPoleDiscord
, an error signal POLEDISC will be set.
In the supervision phase, the switch controller function evaluates the "cause" values
from the switch modules Circuit breaker (SXCBR)/ Circuit switch (SXSWI). At error
the "cause" value with highest priority is shown.
1MRK502052-UEN B
Section 14
Control
719
Technical manual
Содержание Relion REG670
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