PU3 Module SWT 3000 Equipment Manual
Page - 10 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Interference level evaluation
The function of interference level evaluation is to record the level of interference signals applied
for a long time and superimposed on the wanted signal. The interference level alarm (SNALR) is
signaled if a fixed level threshold is exceeded. In the "Switching functions" mode the interference
level evaluation is only activated if a single tone is transmitted (guard or command tone). If the
SWT unit is integrated in the ESB 2000i the signals SWT-SNALR and ESB-SNALR are linked in
the central control module ZST.
Event memory and real-time clock
Protection commands and alarms are provided with time and date and a registration number be-
fore they are entered in the event memory. They are read out by the service PC and this is also
possible from the distant station by means of remote maintenance. The following events are en-
tered:
Incoming protection commands from IFC-D/P,
Outgoing protection commands to the IFC-D/P,
Detected alarms,
Program restart.
Changing date and/or time
Changing the configuration
In case of an overflow the oldest entry in the event memory is overwritten. For more information
about the event memory refer to the service program description in chapter 3!
Clock synchronisation
The system-internal clock can be synchronized by an external clock. The clock synchronisation
input (USYNC) on the module ALRS (terminal a1/c3) is provided for this. The operating point of the
input voltage can be set between 15V (strap x3 (1-2)) and approx. 54V (strap X3 (2-3)) (see also
connection of the ALRS module).
Figure 6: Options for the SWT 3000 clock synchronisation
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