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6-12

Chassis Operations

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.

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Motorola MPMC101 Wartungshandbuch Seite 118