3.10 Radio Power Supply
The long range radio/modem requires a power supply to operate. The RCU provides the following
options:
A regulated supply which can be configured between DC: 3 V and 9 V. This supply is internally
protected by current limit from radio short circuits.
Supply direct from battery. In this case a 6 A fast fuse must be included in the radio cable to
protect the RCU from radio short circuits.
Both of these supplies are provided via the serial port connector on the electronics compartment.
RCUConnect is used to configure which of the supplies is enabled.
Refer page 92 for more information on the radio power interface.
Do not connect a modem directly to the RCU battery
terminals. Always use the serial port connector as
described on page 92.
3.11 Load Break Switch Power Supply
The RCU incorporates a terminal to power other Switchgear devices that Siemens may develop in
the future. This is not used for Fusesaver/CMR installations. If this terminal is shorted to ground
when the LBS switch is ON the battery fuse will blow but no damage will be done to the RCU
electronics.
The LBS switch has no use for Fusesaver/CMR installations
and should normally be turned OFF.
The terminal can be used to supply power to other devices, refer to Siemens Service Centre for
engineering support if this is required.
3.12 Radio/Modem Interface
In order to communicate with the SCADA system master station a long haul radio or modem is
required. The RCU electronics provides two digital interfaces for the radio:
Serial Asynchronous data (Serial Interface)
10/100BaseT (Ethernet Interface)
The use of the Ethernet interface increases the power consumption of the RCU. A purpose built
cable connects the radio/modem to the RCU interface. The design and construction of this cable
may be carried out by the customer referring to section 10.5, or as a value added service
provided by Siemens Service Centre.
To Next Page
Loading...
Need help?
General
