Installation Instructions

1X UBS Macro B T S FRU 220 V AC P ower Supply Module (PSM) Shelf
PSM shelf AC input interconnection
Each PSM slot in the 220 V AC PSM shelf has a bulkhead connector . The 220 V AC line input pins
from the bulkhead connector of the three PSM slots are parallel connected to the AC input buses.
Each 220 V AC PSM has a rear panel AC input & status/alarm drawer connector that mates with
a bulkhead connector in the PSM slot of the 220 V AC PSM shelf .
The AC line input buses in the 220 V AC PSM shelf are connected to the AC input terminal block
on the rear of the 220 V AC PSM shelf . This terminal block is wired to the AC input lines.
The 220 V AC PSM shelf and 220 V AC PSMs can operate with any one of the following AC
power inputs:
• Single -Phase
• 3 -Phase ST AR
• 3 -Phase DEL T A
PSM shelf DC output interconnection
Each PSM slot in the 220 V AC PSM shelf has two contacts (+ feed and – return) for +27 V
DC output.
The 220 V AC PSM shelf has DC output bus bars at the rear of the shelf . The +27 V DC output
contacts of the three PSM slots are parallel connected to DC input bus bars.
The DC input bus bars are interconnected to the 220 V AC input power connector on the rear of
the PSM shelf .
The DC output bus bars are interconnected to the +27 V DC output power cable on the rear
of the PSM shelf . This cable connects to the +27 V DC input power cable on the rear of the
UBS Macro PDU . The PDU distributes the +27V DC operating power to the UBS Macro frame
electronics.
In addition, the DC output bus bars are interconnected to the +27 V DC output power connector
on the rear of the 220 V AC PSM shelf . Usage of this connector is optional. It can be cabled to
back -up batteries for battery charging purposes.
68P09283A64 -3 10 -9
FOA SEP 2007