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Module LED
PSU Status LED
(bitonal):
Figure 16 LEDs: 3,200W PSU – rear panel
Multiple power supply unit modules
The Exos AP 4U100 storage system includes two PSUs which provide redundant power control for the system so that if
one module fails, the other maintains the power supply, and enclosure operation is not affected while you replace the
faulty module.
PSUs are hot-swappable, and replacement should only take a few seconds to do. Replacement must be completed as
soon as possible after the removal of the defective PSU 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 drives will not
receive sufficient cooling. It is essential that the PSU must be installed prior to powering ON the enclosure.
System fan module
Figure 17
shows a System fan used in a 4U100 enclosure. System fans are present at the back of the enclosure, above
PSUs (see
Figure
the four System fan modules used in combination with the two controller channel fan modules. To know about controller
channel fan LED stats, see
34
System overview
PSU OK
Firmware download
(solid green)
in progress
(blinking green)
4). This section provides behavior states of a System fan status LED. Enclosure cooling is provided by
"Controller channel fan module" (page
PSU oriented for use in rear panel sl
LED behavior states
PSU fault/low AC supply
(solid amber)
42).
PSU status LEDs
ot
Ident bit getting
Power OFF
set
(OFF)
(blinking amber)
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Troubleshooting
