Product Info

220 V AC P ower Supply Module (PSM) Shelf Chapter 10: PSM Shelf R eplacement Procedures
220 V AC Power Supply Module (PSM) Shelf
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220 V AC PSM Shelf Description
The 220 V AC P ower Supply Module (PSM) shelf is optional. It is used to convert 220 V AC
input power to +27V DC output operating power for distribution to the UBS Macro BTS frame
electronics.
The 220 V AC PSM shelf is located at 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 220 V AC PSM shelf
within the UBS Macro BTS frame.
Figure 1 -15 –48 V DC and 220 V AC PSM shelves front panel detail on page 1 - 46 shows the
location of I/O port connectors and PSM slots on the front of the 220 V AC PSM shelf .
Figure 1 -17 220 V AC PSM shelf rear panel detail on page 1 - 48 shows the location of input
connector and output cable/connector on the rear of the 220 V AC PSM shelf .
The 220 V AC PSM shelf provides interconnection between the PSM slots AC input/DC output
and the PSM shelf AC input/DC output as well as interconnection between the PSM slots
alarm/status I/O and the PSM shelf alarm & control I/O .
The plug -in PSMs provide AC -DC conversion and +27V DC power output capabilities.
Up to three PSMs can be housed in the PSM shelf . A minimum of two PSMs are equipped for
redundancy . An empty PSM 3 slot is covered with a filler panel.
PSM shelf plug -in modules
The 220 V AC PSM is an AC–DC power supply . It contains AC line input filtering and AC–DC
rectification. The rectifier output is applied to a DC–DC converter .
The 220 V AC PSM operates from a nominal 220 V AC (154 to 300 V) input and provides a 2700
W , +27 V DC (+/– 0.1 V) output. The output is designed to support load current sharing when
configured for parallel output operation with other 220 V AC PSMs.
Three PSMs can provide a maximum of 8100 W , +27 V DC (+/– 0.1 V) output from the 220 V
AC PSM shelf .
Each PSM has internal fans that circulate cooling air from the front to the rear of the module.
Each PSM slides into a slot in the PSM shelf . The AC input & status/alarm drawer connector , on
the rear of the PSM, mates with a bulkhead connector in the PSM slot. Also blade type contacts,
on the rear of the PSM, mate with the DC output bus bar contacts in the PSM slot.
10 -8 68P09283A64 -3
FOA SEP 2007