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Shelf Descriptions and Configurations
3-28 Issue 3 June 2001
â– The ALARM TEST pushbutton provides a test of the fan shelf alarms.
When pressed and held, all LEDs except the CONTROL FAULT LED and
POWER FAULT LED will be lit. After a test is done, the ALARM RESET
pushbutton must be pressed to turn the LEDs off. This is a local test; the
alarm on the fan shelf alarm interface is not activated.
â– Four red FAN FAULT LEDs indicate faults in each of the four independent
fan units.
â– The red FILTER REPLACE LED indicates that it is time to replace the filter.
â– The red CONTROL FAULT LED indicates a fault in the fan shelf monitoring
and control system.
■The red POWER FAULT LED indicates a failure in one of the −48 V power
feeders.
â– The green POWER ON LED indicates that the fan shelf is receiving power
from one of the two −48 V power feeders.
â– Two pushbutton circuit breakers are located near the right side of the front
of the shelf.
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