SIEMENS BSS

1. A30808-X3247-L14-2-7618 67
Information
Base Station System
Technical Description (TED:BSS)
BS-240/241
5 Power Supply and Battery Backup
The AC/DC is used in the Service Rack/Shelter. It contains one or two Frames with
AC/DC rectifier modules, one controller board and two LVD relays per Frame. Up to 6
rectifier Modules can be inserted in one Frame; thus, the number of modules can be
adapted to the actual need for specific loads. The Service Rack/Shelter with two AC/DC
Frames is intended to be used to supply BTSEs with more than 8 carriers.
The AC/DC tasks are:
• supplying all -48V consumers within the BTSE out of 230V AC 3 phase system for
the world market and 207V AC 2 phase system (240V phase to phase) for the US
market
• supplying external equipment with -48V
• charging and supervising of different battery types with different capacities and to
two battery backup systems per AC/DC Frame
• supervising rectifiers, batteries and alarm messaging
• switching off DC outputs (rectifiers as well as battery) in case of under and over
temperature
• hot plug in/out
• operation of two Frames in parallel
The AC/DC and the backup batteries work as an Uninterruptable Power Supply System
(UPS).
The AC/DC system consists of:
• Frame with AC distribution, DC Distribution, EMI-filter, signal distribution between
rectifiers and controller board via backplane
• controller board with battery supervision, rectifier supervision, alarm interface,
EEPROM to store PID
• up to 6 rectifier modules per Frame each 720W -48VDC (N+1 redundancy to achieve
3600W+720W).
• two LVD-Relays per AC/DC Frame
The Backup Battery guarantees continuous operation for a certain time in case of a
power main breakdown or AC/DC failure. Four types of Backup Battery with nominal
capacities of 80Ah, 85Ah, 92Ah and 100Ah are available.
The capacity of the Backup Battery can be increased further by having additional
batteries in separate Service Racks / Shelters.
Note: The Battery Backup Time can also be extended using the feature emergency
configuration.
5.1 Support of Emergency Operation for 3rd Party BBU
System
In the BS-240/241 implementation the switch into emergency configuration (due to a
battery discharge alarm) is triggered by an "ALARM STATUS" CAN bus message that
has been received from the CAN node of the AC/DC controller.
i
Due to the maximum ambient temperature of +55 °C (+131 °F) the DC
output power of one AC/DC module is limited to 720W.
By decreasing the maximum ambient temperature to +50 °C (+122 °F) the
maximum output power of one AC/DC module is increased to 800W
without any change in the module or in the Frame AC/DC.