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Replace Fan Trays on the PTX12008

Maintaining the cooling system in PTX12008 includes removing and installing the fan trays.

Fan trays in the PTX12008 are hot-removable and hot-insertable field-replaceable units (FRUs) installed on the rear panel of the chassis. You can remove and replace the fan trays without powering off the PTX12008 or disrupting the router functions.

Remove a Fan Tray from the PTX12008

Before you remove a fan tray:

  • Ensure that you understand how to prevent electrostatic discharge (ESD) damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available:

    • An ESD grounding strap—not provided

    • A replacement fan tray

    • A Phillips (+) screwdriver, number 2—not provided

    • A pair of heat resistant gloves—not provided

    • A hearing protection device—not provided

Note:

You must replace only one fan tray at a time.

When one fan tray is removed, the remaining fan trays operate at the maximum speed configured by using the set chassis em-policy fan-max-pwm command. If you have not configured the maximum speed, the remaining fan trays operate at 100% speed. If the maximum speed that you configured by using the set chassis em-policy fan-max-pwm command is not 100%, use the request chassis fan tray <slot-number> speed 100 command to configure the remaining fan trays to operate at 100% speed.

We recommend that you take offline the SIB behind the fan tray that you plan to remove by using the request chassis sib slot slot number offline command.

Table 1: Replacement Duration for the Fan Tray

Chassis Ambient Temperature

Traffic (%)

Optic Power per port

Duration (mm:ss)

20 °C

Up to 25%

Up to 30 W

4:40

20 °C

Up to 25%

Up to 18 W

5:50

30 °C

Up to 25%

Up to 30 W

2:40

30 °C

Up to 25%

Up to 18 W

2:40

30 °C

0

Up to 30 W

3:40

30 °C

0

Up to 18 W

5:00

40 °C

0

Up to 18 W

2:10
Warning:

Warning symbol indicating hot surface with triangular shape and wavy lines representing heat.Extreme burn danger—Do not handle a fan tray running in the chassis without wearing heat-protective gloves.

Do not remove a fan tray running in the chassis without wearing a hearing protection device.
CAUTION:

Do not remove a fan tray unless you have a replacement fan tray available.

To remove a fan tray:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to an ESD point on the rear panel of the chassis.
    Figure 1: ESD Point on the Rear Panel of the Chassis Rear panel illustration of a device showing switches, indicators, connectors, labels PSM4, PSM0, PSM7, and a warning symbol highlighted in a green circle.
    CAUTION:

    Warning symbol indicating hot surface with triangular shape and wavy lines representing heat.The fan tray surfaces are hot.
  2. Wear the heat-protective gloves.
  3. Wear the hearing protection device.
  4. Using a Phillips (+) screwdriver, number 2, loosen the two screws on the fan tray.
    Figure 2: Remove a Fan Tray Removing or installing a fan tray from a hardware chassis, showing steps to unlock the tray with a tool and pull it out, with directional arrows.
  5. Slide the latch on the fan tray to the right.
  6. Grasp the top handle of the fan tray and tilt the fan tray out to disengage it from the chassis.
  7. Using both the handles, lift the fan tray out of the slot.
  8. Store the fan tray on a flat surface with the handles facing sideward.

Install a Fan Tray on the PTX12008

The fan trays are installed on the rear panel of the chassis.

Before you begin to install a fan tray:

  • Ensure that you understand how to prevent ESD damage. See Prevention of Electrostatic Discharge Damage.

  • Ensure that you have the following parts and tools available:

    • An ESD grounding strap—not provided

    • A Phillips (+) screwdriver, number 2—not provided

To install a fan tray:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist and connect the other end of the strap to one of the ESD points on the rear panel chassis.
    Figure 3: ESD Point on the Rear Panel of the Chassis Rear panel illustration of a device showing switches, indicators, connectors, labels PSM4, PSM0, PSM7, and a warning symbol highlighted in a green circle.
  2. Taking care not to touch the connectors, grasp the top and bottom fan tray handles and lift the fan tray.
  3. Align the bottom of the fan tray with the fan tray slot.
  4. Rest the tabs on the bottom edge of the fan tray in the slots in the fan tray slot.
  5. CAUTION:

    The fan tray powers on as soon as you install it on a router that is powered on.

     Tilt the fan tray toward the chassis until it is vertical with the chassis and is fully seated.
    Figure 4: Install a Fan Tray Align fan tabs with slots, then insert the fan tray into the designated area; includes close-up views of fan tab and slot for clarity.
  6. Using a Phillips (+) screwdriver, number 2, tighten the captive screws.
  7. If you have configured the fan trays to operate at 100% speed by using the request chassis fan tray <slot-number> speed 100 command, you must configure them to operate at the normal speed by using the request chassis fan tray <slot-number> speed normal command.