Dell FC4500 Hardware Reference Manual page 28

About the Rackmount Disk-Array Processor Enclosure
1
EMC Fibre Channel Disk-Array Processor Enclosure (DPE) Hardware Reference
1-16
SP Fan Pack
Figure 1-13
Latches on the SP fan pack hold the pack in place.
The SP fan pack has one status light visible when the SP fan pack
cover is removed. The status light is described in the "Monitoring
DPE Status" section of Chapter 3.
You can remove the SP fan pack while the DPE is powered up. If the pack is
removed for more than approximately two minutes, the SPs and disk
modules power down. The SPs and disk modules power up when you
reinstall the SP fan pack.
!
Latches
Check light
(amber)