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Operating Procedures
XR900 Power Control
When the AC or DC power cord is attached at the upper left rear
corner of the chassis and connected to an appropriate power source,
3
DC power within the enclosure is controlled during normal
operation through SCSI terminator power. When the host (the
Modular Chassis) is powered up, the XR900 detects the presence of
the
signal and powers itself up in response. When
TERMPWR
terminator power is removed by the host, the XR900 powers down.
A loss-of-cooling shutdown triggered by the environmental
monitor can be reset by cycling any power-controlling input off and
back on. If the cooling sensor has cooled sufficiently, the shutdown
condition then resets.
If the power supply fuse blows, the power supply should be
considered as failed and should be replaced. Damage to the drives
in the enclosure can occur if the fuse opened as a consequence of
component failure in the power supply. Overloading or shorting
the outputs of the power supply does not cause the fuse to blow.
3-7
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