WL Circuit Breakers - Siemens

External CubicleBUS Modules
WL Circuit Breaker
Short-circuit at 1:
Only -Q1 establishes that a short-circuit has
occurred and does not receive a blocking
signal from a subordinate level. For this
reason, it trips after t ZSI = 50 ms. Time
saved = 250 ms.
The ZSI function can be used for shortcircuits
between the phases (S), with
respect to ground (G), or for both
simultaneously (S+G). The operating
mode is set using the rotary switch. If
the switch is in the “OFF” position, the
ZSI is deactivated.
The ZSI module also provides the blocking
signal for medium-voltage level breakers.
If a tie breaker is used in the power
distribution system, this can also be
equipped with the ZSI function and
integrated in the overall concept.
Up to 8 circuit breakers can be connected
to ZSI IN, and up to 20 to ZSI OUT.
Figure
2-14
2/31
The function of the ZSI module is
selected using the rotary switch.
Note: Proper performance cannot be
guaranteed if these limits are exceeded.
The ZSI module must always be the
first external CubicleBUS module to be
connected to the COM15/COM16 module
or to X8.
Test Function
The outputs are set (i.e. a blocking signal
is sent to other circuit breakers) when the
rotary switch is set to “TEST.”
Pressing the “TEST” key switches the ZSI
module to test mode, which is indicated
by the yellow DEVICE LED. The inputs and
outputs are selected in the same way as the
digital input/output modules. When the ZSI
module input is selected, the input can be
toggled internally by pressing and releasing
the TEST key. When the outputs are
selected, the outputs can be toggled by
pressing and releasing the TEST key. This
enables the circuit to be checked.
Technical data for the ZSI module
Operating voltage min./max. 19.2V / 28.8V
Operating current min./max. 31mA / 61mA
Automatic output reset after no more than... 3 s
Shortest time blocking signal can be present at the outputs LV 100 ms
Shortest time blocking signal can be present at the outputs MV 500 ms
Standard trip time (incl. all delays) approx. 80 ms
Max. no. of circuit breakers connectable to ZSI IN 8
Max. no. of circuit breakers connectable to ZSI OUT 20
Max. no. of modules on one WL Circuit Breaker 1
Max. wire length for 2 x 18 AWG twisted pair 400 m
Power loss min./max. 0.8W / 1.76W
Dimensions W/H/D 70mm/86mm
/95mm
Weight 0.223 kg
Operating temperature range -20°C / 60°C
Table
2-22
This table provides technical data for the ZSI module on the CubicleBUS.
Active inputs and outputs are indicated by a
yellow LED.
It is recommended that the ZSI signal be
transmitted via a shielded twisted pair with
a cross-section of at least 0.75 mm 2 (18
AWG), and no more than 400 m long.
WL PROFIBUS/MODBUS Communication and Electronic Accessories