Siemens SENTRON ATC6500, Руководство пользователя

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Applications
3.3 Voltage measurement
3KC ATC6500 transfer control device
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Manual, 05/2019, L1V30538268002A-01
3.3.4 P09 Source Line CHK
In this menu the limit thresholds for the sources are defined.
● Each measurement can be assigned a specific delay time.
Measured anomalies (beyond the threshold values) must be present for longer than the
set delay times, before it can be concluded that there is a line fault.
● When all the line parameters are restored within the specified thresholds, the delay time
must elapse before the restored line may be reconnected. This delay period is
determined by two independent parameters:
– P09.1.07 or P09.2.07 - delay time if the source is within the specified thresholds again
(and Source 2 or Source 1 is not available)
– P09.1.08 or P09.2.08 - delay time if the source is within the specified thresholds again
(and Source 2 or Source 1 is available)
● For the minimum and maximum voltages, two thresholds are defined in each case. One
threshold defines the point beyond which the voltage is no longer considered sufficient
(e.g. P09.n.01, threshold MIN trip voltage). The other threshold, which is closer to the
rated voltage, defines the point beyond which the voltage is sufficient again (e.g.
P09.n.02, threshold MIN reset). The distance between these two thresholds determines
the hysteresis. It is possible to stipulate, for example, that the voltage may no longer be
used when it falls below 80% of the rated voltage, and that in order to be usable again, it
must rise above 85%. This defines a hysteresis of 5% (dead zone). The same principle is
applied to the maximum voltage.
● If the voltage is within the set thresholds when the device is switched on or reset, both
sources are considered to be in order (without considering the delay times), except when
the load is already supplied by a circuit breaker; then the delay times are taken into
consideration.