User guide

Introduction
3
1.2.2 Tower Option
An optional tower kit is available, which can be fitted to the rack chassis described here. Separate documentation is
provided with this option.
1.3 The Plug-in Modules
A Galaxy 55 Enclosure requires one or more of the following modules for normal operation:
1.3.1 Power Supply/Cooling Module
Two Power Supply/Cooling modules (Figure 1–4) are supplied mounted in the rear of the enclosure as part of the
subsystem core product.
Up to three Power Supply/Cooling plug-in modules can be installed in the rear of the Enclosure.
.
1.3.1.1 Intermixing Power Supply Units within a Single Enclosure
Important Mixing of SS-PSU-550 and SS-PSU-450 modules within the same enclosure is not supported.
Table 1–1 PSU Characteristics
SS-PSU-450 SS-PSU-550
Nominal Power 450W 550W
Input Voltage Range switch auto-ranging
Power Factor Correcting no yes
Cooling improved improved
Casing aluminum extrusion aluminum extrusion
Figure 1–4 Power Supply/Cooling Module