IBM 084, Installation And User Manual

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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 43.
The enclosure chassis is keyed to prevent PSUs from being inserted upside down.
The back of the PSU has a power switch, three status LEDs and a socket for the power cord, as shown in
the following figure.
Figure 12. PSU LEDs
Cooling module
The five cooling modules at the rear of the enclosure maintain all system components below their
maximum temperature, assuming the ambient temperature is below 95° F (35°C).
The speed of the fans in the cooling modules is controlled by the SSB I/O modules. For more information
about the system airflow, see “System airflow” on page 16.
Chapter 2. System overview 15