Installation Instructions

P ower Distribution Unit (PDU) Chapter 9: PDU R eplacement Procedures
Power Distribution Unit (PDU)
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PDU Description
The PDU distributes +27 V DC output operating power to the UBS Macro BTS frame electronics.
The PDU is located near the bottom of the UBS Macro BTS frame. Figure 1 -1 UBS Macro BTS
low -tier/low -capacity frame (1000 mm rack) on page 1 - 27 , Figure 1 -2 Low capacity UBS Macro
BTS starter frame (1800 mm rack) on page 1 - 28 and Figure 1 -3 UBS Macro BTS mid -capacity
frame (1800 mm rack) on page 1 - 30 show the location of the PDU within the UBS Macro BTS
frame.
Figure 1 -12 PDU front panel detail on page 1 - 42 shows the location of +27 V DC output power
connectors and circuit breakers on the front of the PDU .
Figure 1 -13 PDU rear panel detail on page 1 - 43 shows the location of +27 V DC input power
cable/connector and +27 V DC input filter capacitor on the rear of the PDU .
The PDU filters the +27 V DC input power and then splits the filtered +27 V DC input power
into +27 V DC branch circuits. Each branch circuit may be equipped with an integrated
circuit breaker and +27 V DC output power connector . Distribution is via output power cables
connected between the PDU +27 V DC output power connectors and the corresponding
equipment +27 V DC input power connector .
The circuit breakers 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 is shipped with the 1st +27 V DC input power cable/connector and filter
capacitor installed. The 2nd +27 V DC input power cable/connector and filter
capacitor are installed, on site, when a 3rd XMI is added to the frame.
The PDU is shipped with a circuit breaker and +27 V DC output power connector
installed for: XMI 1, DMI 1, DMI 2 and S SI 1. When other equipment is added to the
frame, the corresponding circuit breaker and +27 V DC output power connector
is installed on site.
9 -2 68P09283A64 -3
FOA SEP 2007