User guide

Galaxy 55 User Guide
4
PSU voltage operating ranges are nominally 115V or 230V AC, selected by means of a switch on the front of the
PSU, shown in Figure 2–3.
.
An LED mounted on the front panel of the Power Supply/Cooling Module (see Figure 2–3) indicates the status of
the PSU and the fans.
Warning The Power Supply/Cooling module is not an operator removable part. It should only be removed
by a technician who has knowledge of the hazards present within the module.
1.3.1.2 Multiple Power Supply/Cooling Modules
If you have two or three Power Supply/Cooling modules fitted, they operate together. If one fails the others maintain
the power supply and cooling while you replace the faulty unit.
Module replacement should only take a few minutes to perform but must be completed within 20 minutes from
removal of the failed module. Alternatively, if there is no replacement module available, a blanking plate could be
fitted after removing the faulty module.
1.3.2 Enclosure System Interface/Operators Panel Module
Supplied as part of the Enclosure core product, a typical Enclosure System Interface/Operators (ESI/Ops) panel
module is shown in Figure 1–5.
The ESI/Ops Panel provides the enclosure with a micro controller which is used to monitor and control all elements
of the Enclosure. Each element (Power, Cooling, Temperature, Device status) is interfaced to the processor using
an I
2
C (I Square C) Bus.
The SS-OPS2 ESI/Ops panel module variant is used in conjunction with a Galaxy 55 enclosure to provide an
enclosure management interface through SCSI Enclosure Services (SES) protocol.
The SES function is communicated via drives in bays 1/3 and 4/3 (bottom left and right) using an SFF 8067
interface.
Figure 1–5 ESI/Ops Panel Module