Installation Instructions

1X UBS Macro B T S FRU Break er Module Assembly (BMA)
Breaker Module Assembly (BMA)
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BMA Description
The BMA is an integrated circuit breaker and output power connector . The circuit breaker
provides current overload protection for the output power connector .
The BMAs are located on the PDU front panel (see Figure 1 -12 PDU front panel detail on page
1 - 42 .)
The BMAs provide current overload protection for the +27 V DC branch circuits distributed
to the corresponding UBS Macro BTS equipment. The circuit breakers also provide ON/OFF
switching of the +27 V DC output operating power to the corresponding equipment.
The PDU in the UBS Macro BTS may be equipped with the following BMAs:
• up to four 90A for XMI 1 – XMI 4.
• up to five 20A for DMI 1 – DMI 5.
• up to two 20A for S SI 1 – S SI 2.
• up to two 10A for ACC 1 – ACC 2. This BMA has three output power connectors for
accessories.
The actual BMA equipage in the PDU is customer dependent.
Each BMA is arranged so that the circuit breaker is just below the corresponding DC output
power connector .
The PDU front panel cover must be removed to gain access to the BMAs (see Figure 9 -1 PDU
Front P anel Removal/Installation Detail on page 9 - 12 .)
Each BMA is screw mounted to the PDU output bus bars (i.e., +27 V DC and –0 V DC). This
physical mounting provides electrical contact between the bus bars and the BMA. Refer to
Figure 9 -2 PDU Front P anel (cover removed) on page 9 - 12 for BMA screw mounting details.
System impact/considerations
P erforming this replacement procedure will cause BTS downtime and interrupt all
call processing.
68P09283A64 -3 9 -7
FOA SEP 2007