Installation Instructions

1X UBS Macro B T S FRU P ower Supply Modules (PSMs)
Front Panel LEDs
T wo LEDs are on the front panel of each PSM with the following functionality:
• A GREEN LED is displayed when the PSM is enabled and the output voltage is present.
This LED remains on during a minor alarm condition.
• A RED LED is displayed when a hard failure occurs (for example; a F an failure or Converter
failure).
Front Panel Test Ports
A high impedance DC voltmeter can be connected between the two test ports on the front panel
to monitor the DC output voltage.
Rear Panel Connectors
Blade type contacts, on the rear of the PSM, mate with the DC input/output bus bars at the
rear of the PSM shelf .
The status/alarm drawer connector on the rear of the PSM mates with a bulkhead connector
at the rear of the PSM shelf . This connector is cabled to the PSM alarm connector on the
front of the PSM shelf .
Required items
Documents
• None
Tools
• T orque driver
• T25 TORX driver
Torque requirements
• PSM captive M4 retaining thumbscrew , 2.37 N -m (21 in -lb)
Replacement unit
• –48 V DC P ower Supply Module (–48 V DC PSM) — Motorola model STPN4037
• 220 V AC P ower Supply Module (220 V AC PSM) — Motorola model STPN4036
68P09283A64 -3 10 -23
FOA SEP 2007