2.18 Protection Function Control
175
7ST6 Manual
E50417-G1176-C251-A3
tiated by the internal automatic reclosure function is interpreted as a manual reclosure,
even it has been initiated by a control command from the device.
Figure 2-54
Manual closure with internal automatic reclosure
CB
Circuit breaker
ON
Circuit breaker close coil
CBaux
Circuit breaker auxiliary contact
If, however, external close commands which should not activate the manual close
function are possible, e.g. external reclosure device, the binary input
„>Manual
Close“
must be triggered by a separate contact at the control discrepancy switch
(Figure 2-55).
If in that latter case a manual close command can also be given by means of an inter-
nal control command from the device, such a command must be combined with the
manual CLOSE function via a CFC chart. To do so, use the priority class for switchgear
interlocking and the block CMD_INF to derive a logic signal from the switchgear
control command. The
„>Manual Close“
must not be configured to a binary input
in this case. Define this signal as a CFC output signal and add a new indication to the
DIGSI matrix. Use this new binary signal for detection of the manual close signal, and
link it in the CFC chart with an OR gate to the output signal of the CMD_INF block.
Now you connect the output signal of this OR gate with the signal
„>Manual Close“
on the right-hand margin of the CFC chart.
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