Product Info

Break er Module Assembly (BMA) Chapter 9: PDU R eplacement Procedures

Prior to replacing a BMA, the UBS Macro BTS site signaling is shutdown (i.e., disable the BTS

site) then the UBS Macro BTS frame is powered down.

Table 9 -3 PDU R eplacement Conditions

FRU

Ref Designator What to Shutdown...

Breaker Module

Assembly (BMA)

XMI 1 – XMI 4, DMI

1 – DMI 5, S SI 1 –

S SI 2, ACC 1 – ACC

Shutdown site signaling functions and then power

down the frame.

Required items

Documents

•

1X UBS Macro BTS Optimization/A TP

manual.

Tools

• T orque driver

• T25 TORX driver

Torque requirements

• BMA mounting screws; 4.8 N -m (42.25 in -lb) ±10%

Replacement unit

• 90A BMA (Motorola model STLN4093), for XMIs

• 20A BMA (Motorola model STLN6472), for DMIs and S SIs

• 10A BMA (Motorola model STLN6475), for ACCs

Mounting screws are provided with each BMA; four screws with the 90A BMA,

two screws with the 20A BMA and two screws with the 10A BMA.

9 -8 68P09283A64 -3

FOA SEP 2007