Environmental Monitoring Unit
UltraSCSI RAID Enclosure 3–13
Note
For detailed instructions about using the
set emu
commands, refer to the array controller documentation.
Compaq recommends using the
set emu fanspeed=automatic
command, allowing
individual EMUs to implement corrective action if one of the
following error conditions occur:
•
A blower fails.
•
A blower is removed.
•
A blower is rotating too slowly to provide sufficient air flow in
the shelf.
•
The EMU intake air temperature exceeds the user-defined
temperature setting.
•
The backplane exhaust air temperature exceeds the user-defined
temperature setting.
Compaq suggests using the
set emu fanspeed=high
command
for either of the following conditions:
•
EMU intake air temperature is more than 38°C (100°F).
•
No air conditioning is available.
If the EMU detects a blower or temperature error condition, it
automatically switches all the operational blowers to high-speed. This
speed increases the air flow through the enclosure and reduces the
possibility of component failure. Simultaneously, the EMU initiates
the following actions:
•
Sounds the audible alarm on the EMU.
•
Turns O
N
the amber system fault LED if the temperature exceeds
an established set point.
•
Turns O
N
the amber temperature fault LED.
•
Notifies the array controller of the error condition.
