Power Supply Unit (Psu) - IBM 5147-084 Installation And User Manual

Power On/Standby LED (green/amber)
Shows amber when the system is in standby (not operational). Shows green when the system is
on (operational).
Module Fault LED (amber)
Shows amber when there is a system hardware fault. Additionally, an LED may be lit on a PSU,
drawer, DDIC, cooling module, or I/O module that helps you identify which component is at
fault.
Logical Status LED (amber)
Indicates a change of status or fault from something other than the enclosure management (EM)
system. This may be from an internal or external RAID controller or HBA. It is usually associated
with a disk drive and LEDs at each disk drive position help you identify the drive affected.
Drawer 1 Fault LED (amber)
Indicates a drive, cable, or sideplane fault in drawer 1.
Drawer 2 Fault LED (amber)
Indicates a drive, cable, or sideplane fault in drawer 2.
The ops panel is an integral part of the chassis, and is not replaceable on site.

Power supply unit (PSU)

Power is provided by two 2800W PSUs. These units require an input of 200 to 240VAC at 50 to 60Hz.
The following figure shows the PSU.
Figure 11. 2800W PSU
Dual PSUs provide redundant power for the system: if one PSU fails, the other will keep the system
running while you replace the faulty module. The PSUs are hot-swappable. Replacement of a PSU can be
performed while the enclosure is running, but the procedure must be completed within two minutes of
the removal of the defective PSU. Ensure you have a replacement PSU before you remove the defective
PSU. For the replacement procedure, see "Replacing a power supply unit (PSU)" on page 44.
The enclosure chassis is keyed to prevent PSUs from being inserted upside down.
Chapter 2. System overview
15