Technical data

6-12
Chassis Operations
6
Environmental Monitoring
An environmental monitoring function to track enclosure
temperatures and operating voltages is incorporated into the
chassis design. The environmental monitor provides:
❏ Overtemperature Reporting -- the temperature in the chassis,
power supply, or optional SCSI Device Storage Module
exceeds maximum safe termperature (without regard to
which one of the actual sensors causes the activation).
❏ Power Supply Defective Reporting -- the AC or DC input
voltages to the power supply stray out of range.
Assemblies Monitored
In the CPU enclosure, power supply outputs and temperatures are
always monitored.
Note In the 3-slot chassis, enclosure temperature is
monitored through the power supply, since the air is
drawn from the enclosure, through the power supply,
and out of the chassis.
In the dual 9-, 12-, and 20-slot chassis, enclosure
temperature is monitored through sensors mounted on
the backplane.
The SCSI peripheral expansion enclosure has no power supply
monitoring, but is equipped with a backplane temperature sensor.
As long as the RJ45 cabling is installed, SCSI enclosure
temperatures are monitored along with the power supply
voltages/temperatures in the CPU enclosure.