Siemens ANSI/UL 1066, Application Manual

Page: 33 / 96

Power Supply
The Cubicle BUS must be supplied
with a UL Listed 24V DC class 2
power supply across its entire length.
Reference pages 2/33 and 2/34 of
this manual for details pertaining
to the requirements of this power
supply. Terminals X8.3 and X8.4
or the 4-pin plug for the external
Cubicle BUS modules (X3) are available
for this purpose. As previously
mentioned, the 24V is conducted
via the
Cubicle BUS
cables.
The power required for the 24V DC
supply depends on the
Cubicle BUS
configuration. The technical data for
the external
Cubicle BUS modules is
provided later in this chapter.
The control system (of the Cubicle BUS )
must be connected to a fused power
supply (class 2), since the system
voltage drops to an unspecified value
in the event of a short-circuit.
Attention: Connecting and
disconnecting Cubicle BUS modules
when energized is not recommended
and can cause erroneous inputs or
outputs to be generated.
Maximum Cubicle BUS Configuration
The Cubicle BUS can comprise up to 13
modules:
• Electronic Trip Unit (ETU)
• Metering Function or Metering
Function Plus
• Breaker Status Sensor (BSS)
• COM15
• BDA or BDA Plus
• ZSI module
• Digital output module with switch
position to the left (1st module)
• Digital output module with switch
position to the right (2nd module)
• Digital configurable output module
• Digital input module with switch
position to the left
• Digital input module with switch
position to the right
• Analog output module with switch
position to the left (1st module)
• Analog output module with switch
position to the right (2nd module)
In practice, however, not all of the
modules may be required.
Cubicle BUS Installation Guidelines
• Total length of the Cubicle BUS
cables: max. 10 m
• Prefabricated cables must be used
to connect the Cubicle BUS modules.
• The last module on the line must
be terminated with a 120 Ω
terminating resistor (supplied
with each module).
• The cables must always be
connected from module to module.
Star connection is not permitted.
• The power supply must be
provided by a UL Listed 24V DC
class 2 power supply with
standard-tolerance and the
properties described on
page 2/33 and 2/34.
Communication-capable Circuit Breakers
2/21
Table 2-10
At X3, the Cubicle BUS can be
supplied with 24V DC.
If external Cubicle BUS modules are to be connected to the WL Circuit Breaker and a COM15 module is not available, the
first connection must be made with four wires. The Cubicle BUS can then be connected with the supplied Cubicle BUS lines
with RJ45 plugs, and the power supply connected to X3, as shown.
Figure
2-9
Pin Configuration of the X3 on the
Cubicle BUS Module
X3.1 24V DC common
X3.2 Cubicle BUS
Communications line -
X3.3 Cubicle BUS
Communications line +
X3.4 24V DC +
WL Circuit Breaker
WL PROFIBUS Communication and Electronic Accessories • July 2004