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Operating Instructions
Other Subassemblies
3
Assemblies Monitored
Voltage Monitoring Function
3-4
In other parts of the system, temperature sensors provide only the
lower threshold warning. As with power supplies, a heat buildup
beyond the first threshold within a monitored subassembly
illuminates the warning LED on the front of the Modular Chassis.
If temperatures climb further, however, no power shutdown
occurs.
In all cases, the temperature monitoring function covers:
The Modular Chassis power supply
The integral and/or standalone SCSI peripheral expansion
enclosures (provided that the cables are installed)
If an optional backplane thermal sensor is installed, the
temperature monitoring function also covers the Modular Chassis
card cage.
Similarly, overvoltage protection circuitry monitors the power
supply inputs and outputs. If the –48Vdc or 115/230Vac inputs of a
monitored power supply go out of range, or if the +5Vdc output
strays out of tolerance and remains so, the defective power supply
is shut down automatically.
This function is confined to the Modular Chassis itself; voltage
monitoring does not extend to the SCSI peripheral expansion
enclosures.
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