HP Array Controller HSG V8.7 Software - Manual (Page 64)

Environmental Monitoring Unit
3–8 UltraSCSI RAID Enclosure
EMU Firmware
EMU firmware allows the user to use CLI commands to establish
limits for EMU functions such as temperature and blower speed
control. Different firmware versions determine the specific
commands or functions available. The master EMU compares the
temperature sensor readings and blower speed readings against limits
the user entered.
If the EMU is controlling blower speed (automatic mode), the
blowers are automatically placed into high-speed mode when any
sensor reports an airflow temperature that is within 4 degrees Celsius
(°C) or 7 degrees Fahrenheit (°F) of the sensor set point. For example,
if a temperature set point is 37°C (99°F), the EMU would cause the
blowers to operate at high-speed when the temperature reaches 33°C
(91°F). Operating the blowers in high-speed should prevent an
overtemperature condition from occurring and should prevent
shutting down the enclosure.
Compaq recommends using predetermined set points for EMU
firmware versions 1.0, 1.1, and 1.2, as identified in the following
sections.
Table 3–1 EMU Communication Cables
Description
Length
Part
Number
Meters Feet
8-conductor 24 AWG, PVC, round
cable assembly with:
2 – 8 position (8MP) locking,
plug connectors
0.5
1.0
3.0
4.0 1.6
3.3
9.8
13.1
BN26M–0E
BN26M–01
BN26M–03
BN26M–04
CXO5747A