Power supplies
The storage expansion enclosure has two removable power supplies. The power supplies provide power
to the internal components. If one power supply is turned off or malfunctions, the other power supply
maintains electrical power to the storage expansion enclosure.
Note: To preserve the optimal airflow, do not remove a failed power supply FRU from the DCS3700
chassis until you are ready to replace it with a new FRU.
Figure 9 shows the power supply controls, LEDs, and connectors.
Fan assemblies
The storage expansion enclosure has two removable fan assemblies. Each fan assembly contains two fans.
The fan assemblies pull air through the enclosure from front to back across the drives. The fans provide
redundant cooling, which means that if one of the fans fails, the remaining fan assembly continues to
provide sufficient cooling to operate the storage expansion enclosure. The fan will operate at maximum
speed under the following conditions:
v During the first few minutes after power is applied to the DCS3700 enclosure
dcsi0001
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2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
1
2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
ACDC
2
1
I
O
ACDC
2
1
I
O
Seven-segment numeric display
Figure 8. Location of seven-segment numeric display on ESM
dcsi0004
1
2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
1
2
Lnk Lnk Lnk Lnk
ID/Diag
Lnk Lnk
8 8
ACDC
2
1
I
O
ACDC
2
1
I
O
Power connector
Power supply A
Power switch LEDs
Power supply B
Figure 9. Power supply components
Chapter 1. Introduction 13
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