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Figure 6. Power supply and fan unit and airflow
The dc power supply and fan units
EXP810 storage expansion enclosure (models 81S and 81T) has two removable dc
power supply and fan units. Each dc power supply and fan unit contains one dc
power supply and two fans. The four fans pull air through the drive from front to
back across the drives.
The fans provide redundant cooling, which means that if one of the fans in either
fan housing fails, the remaining fans continue to provide sufficient cooling to
operate the storage expansion enclosure.
The power supplies provide power to the internal components. If one dc power
supply is turned off or malfunctions, the other dc power supply maintains power to
the storage expansion enclosure. To preserve the optimal airflow, do not remove a
failed dc power supply and fan unit CRU from the EXP810 chassis until you are
ready to replace it with a new CRU.
Figure 7 on page 11 shows dc power supply and fan unit components.
Note: Although both power supply and fan units (left and right) are identical, they
10
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User's and Maintenance Guide
Lever
are seated in the EXP810 chassis in opposite orientations. If the power
supply and fan unit cannot fully be inserted in the power supply and fan unit
bay, flip it 180 degrees and reinsert it.
Latch
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