Siemens SENTRON VL Series System Manual page 5

4.2 COM20 connection ......................................................................................................................95
4.2.1 Data exchange with the COM20 ..................................................................................................95
4.2.2 Setting the PROFIBUS address of the COM20 ...........................................................................96
4.2.3 COM20 pin assignment ...............................................................................................................97
4.2.4 PROFIBUS installation guidelines COM20..................................................................................98
4.2.5 PROFIBUS DP write protection with COM20 ..............................................................................98
4.2.6 Communication connection to the ETU .......................................................................................99
4.2.7 Connecting the optional motorized operating mechanism to COM20 .........................................99
4.2.8 LED indicators on the COM20 ...................................................................................................102
4.2.9 Measuring accuracy...................................................................................................................103
5 Zone Selective Interlocking.................................................................................................................... 105
5.1 ZSI..............................................................................................................................................105
5.1.1 Introduction ................................................................................................................................105
5.1.2 Selectivity ...................................................................................................................................105
5.1.3 Time selectivity...........................................................................................................................106
5.1.4 ZSI function ................................................................................................................................107
5.1.5 Operating principle.....................................................................................................................108
5.1.6 Course over time........................................................................................................................108
5.1.6.1 Condition ZSI = ON and presence of a short-circuit (S) ............................................................108
5.1.6.2 Condition ZSI = ON and presence of a ground fault (G) ...........................................................109
5.2 Examples ...................................................................................................................................110
5.2.1 Function example.......................................................................................................................110
5.2.2 Tabular representation...............................................................................................................111
5.2.2.1 Short-circuit ................................................................................................................................111
5.2.2.2 Ground fault ...............................................................................................................................111
5.2.2.3 Example of 3 grading levels without coupling switch.................................................................112
5.2.2.4 Cancelation of the ZSI OUT signal ............................................................................................113
5.2.2.5 Coupling switch ..........................................................................................................................114
5.2.2.6 Wiring example ..........................................................................................................................115
5.2.2.7 Circuit breakers without ZSI function .........................................................................................117
5.3 SENTRON 3WL .........................................................................................................................118
5.3.1 Technical data............................................................................................................................118
5.3.2 Applications................................................................................................................................119
5.3.3 Configuration..............................................................................................................................119
5.3.4 Connection .................................................................................................................................119
5.3.5 Test function...............................................................................................................................119
5.3.6 LED ............................................................................................................................................119
5.4 SENTRON 3VL ..........................................................................................................................120
5.4.1 COM20/COM 21 ........................................................................................................................120
5.4.2 Technical data............................................................................................................................120
5.4.3 Applications................................................................................................................................121
5.4.4 Configuration..............................................................................................................................121
5.4.5 Connection .................................................................................................................................121
5.4.6 LED ............................................................................................................................................121
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
Table of contents
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