Siemens WL - Page 92

WL Communication-capable Circuit Breaker
WL Selection and Application Guide • 2005
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WL Circuit Breaker
Digital Output Module
with Rotary Switch
6 binary signals based on the
breaker status (causes of trip
and warnings) can be output
using this module to external
signaling devices or used to
control other specific plant
equipment.
Digital output modules are avail-
able with or without rotary
switches. With rotary switch
modules, you can choose
between two signal blocks each
with 6 defined assignments and
an additional response delay.
All digital output modules are
available either as an optocou-
pler output (NO contact, 150
mA) or a relay output version
(Form C, up to12 A). Two
modules of this type may be
connected to a WL Circuit Breaker.
I/O CubicleBUS Modules
Digital Output Module,
Configurable
The configurable output module
is available for more
sophisticated applications.
With this module, many
protective or setpoint events
can be configured to
actuate one of the six available
outputs. Three of the outputs
can be assigned up to six
events in a logical-OR
operation. The module can be
configured either with the WL
configuration software,
BDA/BDA Plus or via
WinPM.Net.
As with the output modules
with rotary switch, an optocoupler
and a relay version are available.
One module of this type can
be connected to a WL Circuit
Breaker.
Analog Output Module
The analog output module can
be used to output the following
measured values of the circuit
breaker to analog display
devices on the cubicle door:
• amps
• volts
• power
• power factor
• average, Hz, volts, power
Four 4-20-mA/0-10V interfaces
are available for this purpose.
The measured values to be out-
put are selected with a rotary
switch. This analog output module
means there is no need for
additional transformers requir-
ing conventional installation
and wiring in the main bus.
Two modules of this type may
be connected to a WL Circuit
Breaker.
Digital Input Module
The digital input module sup-
ports connection of 6 additional
binary signals (24V DC) within
the circuit breaker system. This
enables the status of a switch
or a cubicle door to be
communicated.
With the digital input module
on the CubicleBUS, it is also
possible to automatically switch
the two different protective
parameter sets held in the
ETU755 and ETU776 trip units
very quickly. This allows, the
automatic changing of the
parameters of a tie breaker in
the event of a power supply
failure.
One module each of this type
can be implemented for the
input of the six digital signals
and for the automatic switch-
over of the parameters.
ZSI Module
If WL Circuit Breakers are
arranged in several levels and
minimal delays are desired, it is
advisable to use the ZSI module.
The circuit breakers are inter-
connected by these modules.
In the event of a short circuit,
all circuit breakers commun-
icate to determine and isolate
the exact short circuit location.
Thus, only the closest upstream
circuit breaker will be opened.
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