PSU LEDs
Under normal conditions, the bi-tonal PSU Status OK LED will be a constant green. See also Figure 15 on
page 17. When a fault occurs, the color of the LEDs will display as shown in the following table.
Table 16. PSU LED status
PSU status (green) PSU status (amber) Status
Off Off No AC power on this PSU only
On Off AC present; PSU working
correctly
Off On PSU fault (over temperature, over
voltage, over current)
Off Blinking PSU rmware download is in
progress
Front panel LEDs
The front panel displays the aggregated status of all the modules. The enclosure status LEDs located on
the front panel are labeled in Figure 14 on page 15 and they are individually described in the narrative
subsections that follow the table.
Disk drive carrier module LED
Disk drive status is monitored by an amber LED mounted on the front of each drive carrier module, as
shown in the gure below. The drive module LED conditions are dened in the table following the gure
below.
In normal operation the amber LED will be:
• Off if there is no drive present.
• Off as the drive operates.
• On if there is a drive fault.
Figure 26. Drive carrier module LED
Table 17. Drive carrier module LED
State (Amber) Status
Off Enclosure is not powered on.
Off Disk drive module is installed and operational
Blinking: 1s on/1s off SES device identity set
On SES device fault bit set
On Power control circuit failure
48 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual
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