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Environmental Monitoring Unit
EMU Status Reporting
3–14 UltraSCSI RAID Enclosure
•
Starts the EMU timer if: (1) all blowers in a shelf bank are
defective, or (2) a blower is removed.
•
Approximately eight minutes after the EMU timer begins
operating, the array controllers will shut down and then the EMU
turns O
the dc power in the enclosure to prevent continued
FF
overheating and potential equipment damage.
Momentarily depressing the alarm control switch causes the EMU
audible alarm to turn O
FF
this time, the blower LEDs display system fault codes that are
essential to pinpointing the fault. See the Configuration Fault Code
Reporting section within this chapter.
The EMU processes subsystem status reports and notifies the user of
problems via an EMU audible alarm and EMU status LEDs. Figure
3–5 identifies the numerous EMU status LEDs.
Figure 3–5 EMU Status LEDs
1
4
2
3
The EMU processes two types of problems:
•
Error conditions—involves the failure of a component or
conditions outside the predetermined environment, such as an
overtemperature condition.
If an error condition is detected, the system fault LED
(C
1) turns O
ALLOUT
system fault LED indications, see the Error Condition Reporting
section within this chapter.
, but the fault status LEDs remains O
1.
8
7
6
5
2.
4
3
2
1
3.
5
4.
CXO5748B
5.
. For detailed information about other
N
. At
N
Figure C
ALLOUTS
System fault LED
Alarm control
switch
Temperature LED
Power LED
Blower LEDs
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