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The functional block diagram shown in
Figure 12: RCU functional block diagram on
page 16 identifies the main elements of the
RCU.
A short-range radio with built-in
antenna that is used by the
microprocessor to communicate to a PC
to enable configuration of the RCU. The
short-range radio is inside the
electronics compartment.
A short-range radio with built-in
antenna that is used by the
microprocessor to communicate to the
FS mounted on the line above the RCU.
The short-range radio is inside the
electronics compartment.
The microprocessor retrieves data from
the FS for sending to the SCADA system.
The microprocessor is inside the
electronics compartment.
The data interface between the
microprocessor and the long-range radio
(or modem). This has a variety of
possible interfaces. The data interface is
inside the electronics compartment.
The long-range radio which connects to
an external antenna to communicate
with the SCADA system. The long-range
radio is outside of the electronics
compartment and is mounted on a
removable radio tray.
A power supply system which can take
power from either a solar panel or from
a 115 V or 230 Vac source and uses it to
charge a standby battery. The power
supply system provides power to all the
parts of the RCU including the long-
range radio or modem. The power
supply is inside the electronics
compartment. The standby battery is in
a separate compartment.
An operator control panel (optional)
which connects to the microprocessor to
provide additional status displays and
controls for an operator.
RCU internal database and controls
The RCU maintains an internal database,
which can be accessed by a SCADA protocol.
The database consists of three parts:
Points from the Fusesavers, such as
open/closed or line current.
Points from the RCU itself, such as door
open or remote control active.
Controls, such as FS trip/close or change
to FS protection mode.
Refer to the relevant protocol manual for
more detail on the database and controls.
RCU Connect utility
To interface to the Fusesavers and to the
SCADA system, the RCU requires a
configuration which is set up using a utility
running on a PC called RCU Connect. RCU
Connect is used to specify the information
that the RCU needs to operate. RCU Connect
is also used to commission and test the RCU.
Instructions on how to use RCU Connect and
the configuration parameters are in RCU
commissioning beginning on page 41.
RCU Connect cannot change the FS policies
or settings or operate the Fusesavers. This is
carried out using the Siemens Connect
utility running on a PC. Refer to the Siemens
FS operating instructions
IC1000-F320-A170-XX-XXXX.
RCU Connect uses wireless communication
from the PC for which a USB antenna (the
same one that is used for communication
between a PC and a FS) is required. To
enable communications, the RCU door must
be opened as this allows RCU Connect to
start communications at any time over the
next 10 minutes. If communications are not
started within 10 minutes, then the door
must be closed and opened again.
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