3 Maintain the ATCA Subrack
3.3 Fan Tray
An alarm is sent to the OMC-R if a fan unit fails. Although the traffic is not
interrupted, you must replace the fan as soon as possible, to prevent the
system from overheating.
Running the system longer than 30 seconds with less than three blowers
damages the system.
If you exchange a fan tray in a running system ensure that the exchange
procedure is finished within 1 minute.
A fan cover in a running system can not be removed more than 3 minutes.
Operating the system without cooling causes overheating of system
components.
3.3.1 Prerequisites
Inserting tools or fingers into operational fans may cause injuries. When
removing a fan tray, pay attention to rotating fans. Fans become exposed when
the fan tray is pulled. Keep clear of the fans as long as they are rotating.
Note: If the system overheats:
Telecommunication functions are affected
There could be a station switchover.
CLOSED /
OPEN
HS/ OOS
Fan tray toggle switch
Hot Swapp LED
Out Of Service LED
Figure 6: Front Fan Unit
The system is equipped with four fan trays:
Two front fan trays
Two back fan trays with handle.
A fan replacement procedure may be necessary if:
The fan is faulty
A maintenance operation must be performed.
24 / 90 3BK 21281 AAAA PCZZA Ed.13
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