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Shelf Descriptions and Configurations
Issue 1 December 1997 3-21
The following pushbuttons and LEDs are accessible through the front cover of the
fan shelf:
■ The ALARM RESET pushbutton near the left side of the front of the shelf is
used to reset fan shelf alarms and register a new combination of set-point
switch settings. Once a fan shelf alarm is turned on, it can be reset only by
clearing the trouble condition and then pressing the ALARM RESET
pushbutton.
■ 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.
■ Four red FAN FAULT LEDs indicate faults in each of the four independent
fan units.
■ The red FILTER REPLACE LED indicates that it is time to replace the filter.
■ 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.
■ The green POWER ON LED indicates that the fan shelf is receiving power
from one of the two −48 V power feeders.
■ Two pushbutton circuit breakers are located near the right side of the front
of the shelf.
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