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Maintaining the PTX3000 Cooling System

Maintaining PTX3000 Cooling System Components

Maintaining the PTX3000 Air Filters

Purpose

For optimum cooling, verify the condition of the main cooling system air filter, third-generation FPC air filters, and PIC air filters, if applicable.

Action

On a regular basis:

  • Check the air filters for dust and debris. Replace the filter elements. The filter elements degrade over time, so the filter elements in use, as well as spares, must be replaced every 6 months.

  • The shelf life of polyurethane filter varies from two years to five years depending on the storage conditions. Store in a cool, dry, and dark environment. Wrap the media in plastic and store in an environment with relative humidity between 40%- 80% and temperature between 40°F (4° C) to 90°F (32° C). Note that if the material flakes, or becomes brittle when rubbed or deformed, it is no longer usable.

CAUTION:

Always keep the air filters in place while the PTX3000 is operating. The fans are very powerful, and could pull small bits of wire or other materials into the PTX3000 through the unfiltered air intake. This could damage the PTX3000 components.

Maintaining the PTX3000 Fan Trays

Purpose

For optimum cooling, verify the condition of the fan trays.

Action

On a regular basis:

  • Check the fan tray LEDs on the craft interface. During normal operation, the LEDs are lit green to indicate that the cooling system is functioning normally.

  • Place your hand near the exhaust vents at the rear of the chassis to determine whether the fans are pushing air out of the chassis.

    • The zone 0 air exhaust is located in the upper rear of the chassis.

    • The zone 1 exhaust vent is located at the lower rear of the chassis.

    • The power system air exhausts from the power supply modules (PSMs).

  • Monitor the status of the fans. During normal operation, the fans in each fan tray function at less than full speed. Each fan tray contains multiple fans that work in unison to cool the PTX3000 components. If one fan fails, the host subsystem adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and a yellow alarm is triggered when a fan tray is removed.

  • To display the status of the fans, issue the show chassis fan command.

Replacing a PTX3000 Chassis Air Filter

Removing a PTX3000 Chassis Air Filter

The air filter is located below the upper FPC and PIC card cage. The air filter weighs 1.0 lb (0.5 kg).

To remove the air filter:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Pull to remove the air filter cover and air filter (see Figure 1).
  3. Remove air filter from the air filter cover.
  4. Discard the air filter.
Figure 1: Removing a PTX3000 Chassis Air FilterRemoving a PTX3000 Chassis Air Filter
  1
Air filter cover
  2
Air filter

Installing a PTX3000 Chassis Air Filter

To install the air filter:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Place the air filter in the air filter cover (see Figure 2).
  3. Reinstall the horizontal air filter cover on to the chassis.
Figure 2: Installing a PTX3000 Chassis Air FilterInstalling a PTX3000 Chassis Air Filter
  1
Air filter cover
  2
Air filter

Replacing a PTX3000 FPC Air Filter

Removing a PTX3000 FPC Air Filter

First-generation FPCs do not have vents that require air filters.

Third-generation FPCs (FPC3-SFF-PTX) have air vents on the FPC faceplate, and have a field-replaceable air filter cover over the air vents.

To remove the FPC air filter (see Figure 3):

  1. To prevent damage to the equipment caused by static discharge, attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Loosen the thumbscrews that secure the air filter cover to the FPC faceplate.
  3. Pull to remove the air filter cover and air filter.
  4. Remove the air filter from the air filter cover.
  5. Discard the air filter.
Figure 3: Removing an FPC Air FilterRemoving an FPC Air Filter
  1
Air filter cover
  3
Vents
  2
Air filter
 

Installing a PTX3000 FPC Air Filter

To install the FPC air filter (see Figure 4):

  1. To prevent damage to the equipment caused by static discharge, attach an ESD grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Place the air filter in the air filter cover.
  3. Reinstall the air filter cover on to the FPC faceplate.
  4. Tighten the thumbscrews that secure the air filter cover to the FPC faceplate.
Figure 4: Installing an FPC Air FilterInstalling an FPC Air Filter
  1
Air filter cover
  2
Air filter

Replacing a PTX Series PIC Air Filter

Removing a PTX Series PIC Air Filter

The 10-port 10-Gigabit Ethernet/40-Gigabit Ethernet/100-Gigabit Ethernet PIC with QSFP28 (P3-10-U-QSFP28) has air vents on the PIC faceplate, and has a field-replaceable air filter cover over the air vents.

To remove the PIC air filter (see Figure 5):


  1. Loosen the thumbscrews that secure the air filter cover to the PIC faceplate.
  2. Pull to remove the air filter cover and air filter.
  3. Remove the air filter from the air filter cover.
  4. Discard the air filter.
Figure 5: Removing a PIC Air FilterRemoving a PIC Air Filter
  1
Air filter cover
  3
Air vent
  2
Air filter
 

Installing a PTX Series PIC Air Filter

To install the PIC air filter (see Figure 6):


  1. Place the air filter in the air filter cover.
  2. Reinstall the air filter cover on to the PIC faceplate.
  3. Tighten the thumbscrews that secure the air filter cover to the PIC faceplate.
Figure 6: Installing a PIC Air FilterInstalling a PIC Air Filter
  1
Air filter cover
  3
Air vent
  2
Air filter
 

Replacing a PTX3000 Upper Fan Tray

Removing a PTX3000 Upper Fan Tray

The upper fan tray is located above the upper card cage. The fan tray weighs 7.5 lb (3.4 kg).

CAUTION:

Do not remove both fan trays at the same time or remove one of the fan trays for longer than four minutes. Removing both front fan trays or removing one of the fan trays for an extended period of time might cause the PTX3000 to shut down.

To remove an upper fan tray (see Figure 8):

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Using a Phillips (+) screwdriver, number 1, loosen the outer captive screws on each side of the upper cable management system (Figure 7). Move the upper cable management system outward and down so that you can access the upper fan tray.
  3. Slide the release latch located on the right side of the fan tray to the left. Grasp the handle on the left side of the fan tray, and pull the fan tray completely out of the chassis.
Figure 7: Lowering the Upper Cable Management SystemLowering the Upper Cable Management System
Figure 8: Removing an Upper Fan TrayRemoving an Upper Fan Tray

Installing a PTX3000 Upper Fan Tray

To install an upper fan tray (see Figure 9):

CAUTION:

Wait at least ten seconds before replacing a fan tray after you remove it. If you replace a fan tray too quickly, the PTX3000 might not recognize the fan tray and a major alarm can occur. If a major alarm is raised while you are replacing a fan tray, then wait approximately ten seconds after you remove the fan tray, and then try to install a new fan tray or the one you had removed.

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Grasp the fan tray by its handle and insert it straight into the chassis (Figure 9).
  3. Lift the upper cable management system back into place in front of the upper fan tray (Figure 10). Using a Phillips (+) screwdriver, number 1, tighten the outer captive screw on each side of the cable management system to secure it to the chassis.
Figure 9: Installing an Upper Fan TrayInstalling an Upper Fan Tray
Figure 10: Lifting the Upper Cable Management SystemLifting the Upper Cable Management System

Replacing a PTX3000 Lower Fan Tray

Removing a PTX3000 Lower Fan Tray

The lower fan tray is located below the lower card cage. The fan tray weighs 7.5 lb (3.4 kg).

CAUTION:

Do not remove both fan trays at the same time or remove one of the fan trays for longer than four minutes. Removing both front fan trays or removing one of the fan trays for an extended period of time might cause the PTX3000 to shut down.

To remove the lower fan tray:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Using a Phillips (+) screwdriver, number 1, loosen the outer captive screws on each side of the lower cable management system (Figure 11), and move the lower cable management system up so that you can access the lower fan tray.
  3. Slide the release latch located on the right side of the fan tray to the left. Grasp the handle on the left side of the fan tray, and pull the fan tray completely out of the chassis (Figure 12).
Figure 11: Raising the Lower Cable Management SystemRaising the Lower Cable Management System
Figure 12: Removing a Lower Fan TrayRemoving a Lower Fan Tray

Installing a PTX3000 Lower Fan Tray

To install a lower fan tray (see Figure 13):

CAUTION:

Wait at least ten seconds before replacing a fan tray after you remove it. If you replace a fan tray too quickly, the PTX3000 might not recognize the fan tray and a major alarm can occur. If a major alarm is raised while you are replacing a fan tray, then wait approximately ten seconds after you remove the fan tray, and then try to install a new fan tray or the one you had removed.

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Grasp the fan tray by its handle and insert it straight into the chassis.
  3. Lower the cable management system back into place in front of the lower fan tray. See Figure 14. Using a Phillips (+) screwdriver, number 1, tighten the outer captive screw on each side of the lower cable management system to secure it to the chassis.
Figure 13: Installing a Lower Fan TrayInstalling a Lower Fan Tray
Figure 14: Lowering the Lower Cable Management SystemLowering the Lower Cable Management System