Replacement Fan Tray Assembly for the
8820 Broadband Access Concentrator
Model 8820-S2-900
Installation Instructions
Document Number 8820-A2-GZ44-10
June 2004
What is the Fan Tray Assembly?
The fan tray assembly is a dedicated cooling device installed in the chassis of the
8820 Broadband Access Concentrator (BAC) to provide forced-air cooling of the
chassis. The fans, located at the top of the BAC chassis, draw cooling air
upwards from the bottom of the chassis, through the circuit cards or card cage,
forcing the air out the opening, located at the top rear of the chassis.
The fan tray assembly consists of six fans, a metal bracket, and a printed wiring
board (PWB) with a press-fit connector and five status LEDs. Each fan provides a
sense wire that indicates the status of the fan. The sense wires are connected to
the backplane via the fan tray’s PWB and its connector.
The rated airflow is 900 cfm (based on 6 fans at 150 cfm each) at zero back
pressure.
The fan tray is powered by 48 VDC from the backplane of the 8820 BAC.
Nominal power consumption is less than 100 watts, depending upon the
manufacturer.
An LED is on the fan tray so that if a fan failure occurs, a signal is sent to the
SCP card or MCP card and the yellow Fan ALARM LED on the chassis lights.
Removal of the fan tray also causes the SCP card or MCP card to sense an
alarm.
The fan tray assembly weighs 10 lbs (22 kg). It is secured in place by two
fan-locking brackets located on the right and left front of the assembly.
8820-A2-GZ44-10
June 2004
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!
!
ATTENTION:
UN RISQUE MÉCANIQUE EXISTE EN RAISON DE LA ROTATION DES
PALES DU VENTILATEUR. GARDER LES MAINS ET LES DOIGTS LOIN
DES PALES DU VENTILATEUR PENDANT LE DEMONTAGE DU CACHE
DU VENTILATEUR. UTILISER UNIQUEMENT LES ZONES INDIQUÉES DE
TRACTION POUR DÉMONTER LE CACHE DU VENTILATEUR.
VORSICHT:
VERLETZUNGSGEFAHR AUFGRUND ROTIERENDER
VENTILATORFLÜGEL. BEI ABNAHME DER VENTILATOR-ABDECKUNG
ODER AUSBAU DES VENTILATORS NICHT IN DEN
ROTATIONSBEREICH DES VENTILATORS GREIFEN. BEI AUSBAU DES
VENTILATORS FESTE UND BEWEGLICHE TEILE NUR AN DEN
GEKENNZEICHNETEN STELLEN BERÜHREN.
3. Using both hands, place your index fingers in the PULL AREA openings and
pull forward about an inch to disconnect the fan tray’s connector from the
backplane. The spinning fan blades will now be visible.
Ground Wire
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4. Wait until the fan blades stop spinning (which should be less than a
minute). Disconnect the ground wire attached to the fan tray bracket, from the
quick connect terminal on the chassis.
5. Remove the fan tray from the chassis.
8820-A2-GZ44-10
June 2004
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Installing a Replacement Fan Tray Assembly
You will need a Phillips screwdriver to install a replacement fan tray.
" Procedure
To install a replacement fan tray:
1. Hold the replacement fan tray horizontally and guide its tabs into the two card
guides located inside the right and left side plates.
PULL
AREA
PULL
AREA
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UNDER THE
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USE THE
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00-16795
!
WARNING:
If the chassis is powered on, once the fan tray’s connector is seated in
the backplane’s connector, the fan blades start spinning. Proper care
should be taken to prevent contact with the spinning fan blades.
2. Pressing on the front of the fan tray bracket, push the fan tray half way in and
attach the ground wire. Then, fully seat the fan tray.
NOTE:
When the fan tray is running at full speed the Fan ALARM LED will go
out, indicating that all fans are operating properly.
3. Loosen the two screws slightly on each locking bracket and slide the locking
brackets outward until they engage the slots located on the left and right side
plates.
NOTE:
When properly extended or locked, the brackets should be extended into
the slots on the side plates and a threaded insert on the locking bracket
should be aligned with (and visible through) the two outermost holes of
the fan tray.
4. Tighten the two screws on each bracket, making sure that the bracket’s
inserts stay aligned with the holes in the fan tray.
June 2004
8820-A2-GZ44-10
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5. Replace the fan cover plate, aligning the five holes at the bottom with the five
status LEDs.
6. Replace and tighten the three screws removed earlier to secure the fan cover
plate to the chassis.
Warranty, Sales, Service, and Training Information
Contact your local sales representative, service representative, or distributor
directly for any help needed. For additional information concerning warranty,
sales, service, repair, installation, documentation, training, distributor locations, or
Paradyne worldwide office locations, use one of the following methods:
H
H
Telephone: Call our automated system to receive current information by fax
or to speak with a company representative.
— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 1-727-530-2340
Copyright E 2004 Paradyne Corporation. Printed in U.S.A.
8820-A2-GZ44-10
June 2004
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*8820-A2-GZ44-10*
*8820–A2–GZ44–10*
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