User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - SB421
TetraFlex® 7.5 Manual 1-10
The 3 screw connection block for the 100-240V AC mains power Phase, Null and Ground is
located on the inner left side of the SB421 housing.
The 100-240V AC mains power connection shall be provided with an
appropriate fuse according to the selected mains supply voltage as to
ensure a consumption of 4,5A (110V) / 2A (230V).
The cables used for the 100-240V AC and -48V DC to the base stations
must be equal to or more than 3 x 1,5mm
2
The type of mains cable and fastening of cables must at all times be in
accordance with local rules and specifications.
1.1.4.7 Internal -48 battery assembly (option)
The SB421 is operated at -48V nominal DC (SELV) derived from the internal power supply.
An internal or external battery pack may be connected for backup purposes.
If an internal battery assembly is installed, the battery serial connection wire located at the
top front of the batteries is disconnected at delivery to avoid the battery from being drained.
Please reconnect the wire before use.
Also make sure that the internal/external temperature sensor switch (SW 171 located at the
top right hand corner of the interconnection board) is set to internal.
To ensure stable backup power, it is recommended to check/exchange the battery every 2
years.
1.1.4.8 External -48 battery kit (option) connection block
The 3 screw connection block for -48V DC, 0 and ground is located on the inner right side of
the SB421 housing.
The SB421 is operated at -48V nominal DC (SELV) derived from the internal power supply.
An internal or external battery pack may be connected for backup purposes.
When using an external battery pack, the plus pole of the battery pack shall be grounded with
a 5mm
2
yellow/green wire.
Note: In case of using an external battery supply where the plus pole
not is connected to ground then the connection shall include a
disconnection device which disconnects both poles simultaneously,
otherwise there shall be a disconnection device, inserted in the
connection to the minus pole.
The external battery pack consists of a DIN-rail containing a 10A circuit breaker, a 3-pole
terminal strip, a 4-pole modular coupler and the necessary cabling.
The DIN-rail must be mounted as close to the external battery as possible.