Juniper Networks MX480, MX240 User Manual

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MX240 and MX480

Ethernet Services Router

Fan Tray Installation Instructions

13 February 2008

Part Number: 530-022145-01

Revision 1

 

 

 

This document describes how to remove and replace the fan tray on a Juniper

 

 

Networks MX240 and MX480 Ethernet Services Router. The fan tray and the air filter

 

make up the cooling system.

 

Contents

Cooling System ...............................................................................................

2

 

Replacing the Fan Tray ....................................................................................

4

 

Removing the Fan Tray .............................................................................

5

 

Installing the Fan Tray ..............................................................................

6

 

Electrostatic Discharge Point ...........................................................................

7

 

Preventing Electrostatic Discharge Damage ....................................................

9

 

List of Technical Publications ..........................................................................

9

 

Requesting Technical Support .......................................................................

16

 

Revision History ............................................................................................

17

1

Juniper Networks MX480, MX240 User Manual

MX240 and MX480 Ethernet Services Router Fan Tray Installation Instructions

Cooling System

The cooling system consists of the following components:

Fan tray

Air filter

The cooling system components work together to keep all router components within the acceptable temperature range (see Figure 1 on page 2, Figure 2 on page 2, Figure 3 on page 3, Figure 4 on page 3, Figure 5 on page 4, and

Figure 6 on page 4). The router has one fan tray and one air filter that install vertically in the rear of the router. The fan tray contains three fans on an MX240 router and six fans on an MX480 router.

The air intake to cool the chassis is located on the side of the chassis next to the air filter. Air is pulled through the chassis toward the fan tray, where it is exhausted out the side of the system. The air intake to cool the power supplies is located in the front of the router above the craft interface. The exhaust for the power supplies is located on the rear bulkhead power supplies.

Figure 1: Airflow Through the MX240 Chassis

Figure 2: Airflow Through the MX480 Chassis

The host subsystem monitors the temperature of the router components. When the router is operating normally, the fans function at lower than full speed. If a fan fails or the ambient temperature rises above a threshold, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range. If the ambient maximum temperature specification is exceeded and the system cannot

2Cooling System

Cooling System

be adequately cooled, the Routing Engine shuts down the system by disabling output power from each power supply.

Figure 3: Fan Tray in an MX240 Router

Figure 4: Fan Tray in an MX480 Router

Cooling System 3

MX240 and MX480 Ethernet Services Router Fan Tray Installation Instructions

Figure 5: Air Filter on an MX240 Router

Figure 6: Air Filter on an MX480 Router

Replacing the Fan Tray

The router has one fan tray that installs vertically in the rear of the chassis. The fan tray contains three fans on an MX240 router and six fans on an MX480 router. The fan tray is hot-removable and hot-insertable.

The fan tray is located in the rear of the chassis on the right side. The fan tray weighs about 6.8 lb (3.08 kg).

NOTE: To prevent overheating, install the replacement fan tray immediately after removing the existing fan tray.

4Replacing the Fan Tray

Replacing the Fan Tray

To replace the fan tray, use the following procedures:

Removing the Fan Tray on page 5

Installing the Fan Tray on page 6

Removing the Fan Tray

To remove the fan tray (see Figure 7 on page 5 and Figure 8 on page 6):

1.Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 9.

2.Loosen the captive screws on the fan tray faceplate.

3.Grasp the fan tray handle and pull it out approximately 1 to 3 inches.

WARNING: To avoid injury, keep tools and your fingers away from the fans as you slide the fan tray out of the chassis. The fans might still be spinning.

4.Press the latch located on the inside of the fan tray to release it from the chassis.

5.Place one hand under the fan tray to support it and pull the fan tray completely out of the chassis.

Figure 7: Removing the Fan Tray from an MX240 Router

Replacing the Fan Tray 5

MX240 and MX480 Ethernet Services Router Fan Tray Installation Instructions

Figure 8: Removing the Fan Tray from an MX480 Router

Installing the Fan Tray

To install the fan tray (see Figure 9 on page 7 and Figure 10 on page 7):

1.Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 9.

2.Grasp the fan tray handle and insert it straight into the chassis. Note the correct orientation by the this side up label on the top surface of the fan tray.

3.Tighten the captive screws on the fan tray faceplate to secure it in the chassis.

6Replacing the Fan Tray

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