40 System overview
PCMs are hot-pluggable, and replacement should only take a few seconds to do. Replacement must be completed
as soon as possible after the removal of the defective PCM to avoid a thermal exception. The replacement
procedure should be completed within an absolute maximum of 2 minutes.
IMPORTANT: Operation of the enclosure with any modules missing will disrupt the airflow, and the disks will
not receive sufficient cooling. It is essential that all slots are fitted with PCMs prior to powering on the enclosure.
System airflow
The system must be operated with low pressure rear exhaust installation. Back pressure created by rack doors and
obstacles is not to exceed 5 pascals (0.5mm water gauge). The cooling system provides sufficient capacity to
ensure that maximum temperatures are not exceeded.
IMPORTANT: The environment in which the enclosure operates must be dust-free to ensure adequate airflow.
Power supply unit – 5U enclosures
Power is provided by two 2,214W PSUs. The PSU voltage operating range is nominally 200V–240V AC, and
operates at 50–60 Hz input frequency. The isometric rear orientation in Figure 34 shows the PSU aligned for
insertion into its slot located on the enclosure rear panel.
Figure 34 LEDs: 2,214W PSU – 5U enclosure rear panel
2,214W Power Supply Unit LED descriptions (see inset illustration detail above)
Power OK LED (Green) PSU Fail LED (Amber/blinking amber)
AC Input Fail LED (Amber/blinking amber)
LED behavior
• If any of the PSU LEDs are illuminated amber, a module fault condition or failure has occurred.
• For a detailed description of PCM LED behavior, see “PSU LEDs” (page 100).
PSU Fail
AC Input Fail
Power OK
PSU LEDs Inset
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