Siemens SENTRON VL Series

Table of contents
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
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