Applications; Configuration; Connection; Test Function - Siemens SENTRON VL Series System Manual

5.3.2

Applications

The function of ZSI can be used for the short-circuit between the phases (S), short-circuit to
ground (G), or both simultaneously (S + G). The ZSI module provides ZSI information for the
medium voltage level via the MV-OUT signal.
If a coupling switch is used in a power distribution system, it can be integrated into the ZSI
concept.
5.3.3

Configuration

The operating mode is set using a rotary coding switch. If this is at the "OFF" position, the
ZSI function is switched off.
5.3.4

Connection

The ZSI module must always be connected to COM1x or X8 as the first external CubicleBUS
module.
Up to 20 circuit breakers can be connected in parallel to ZSI IN, and up to 8 circuit breakers
can be connected in parallel to ZSI OUT.
5.3.5

Test function

The outputs are set in the "TEST" switch position on the rotary coding switch (that is, a
blocking signal is sent to other breakers).
Pressing the "TEST" button switches the ZSI module to test mode. Test mode is indicated by
the yellow DEVICE LED. The inputs and outputs are selected in the same way as on the
digital input/output modules. If the input of the ZSI module is selected, the input can be
activated by pressing and releasing the "TEST" button. If the outputs are selected, they can
be activated by pressing and releasing the "TEST" button.
This makes it possible to check the cables.
The trip times can be checked with the function testing device (3WL9111-0AT44-0AA0).
5.3.6

LED

The activated inputs or outputs are indicated by a yellow LED.
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
Zone Selective Interlocking
5.3 SENTRON 3WL
119