Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Install and Remove QFX5700 Power System Components

 

The QFX5700 switches support AC, DC power supplies. To install and remove the power supplies in a QFX5700, read the following sections. All power supply models are hot-insertable and hot-removeable field-replaceable units (FRUs). You can install up to three power supplies in the rear of the chassis in the slots provided along the left side.

Caution

Use the same type of power supply in all slots. Do not mix power supply models in the same chassis.

Note

See the heat symbol . Wear heat-resistant hand gloves while accessing the fan tray and power supply.

Install a Power Supply

Caution

Use the same type of power supply in all slots. Do not mix power supply models in a production chassis.

Warning

Protect yourself from severe burns by wearing heat-protective gloves when removing a running power supply from the chassis. The power supply can reach temperatures between 158°F to 176°F (70°C to 80°C) under running conditions.

Before you install a power supply in the chassis:

  • Ensure that you have followed all safety warnings and cautions.

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

  • If the AC or DC power source outlets have a power switch, set them to the off (O) position. Ensure that you have the following parts and tools available to install the power supply:

    • Electrostatic discharge (ESD) grounding strap

    • Phillips (+) screwdriver, number 1

    • Power cables appropriate for your geographical location (for low-voltage installations) or input amperage (for high-voltage installations). HVAC and HVDC connectors and lugs must be installed by a qualified electrician before installation.

To install a power supply in a QFX5700:

  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 chassis. There is an ESD point located next to the protective earthing terminal and below PSU2 on the rear of the QFX5700 (see Figure 1).
    Figure 1: ESD Point on the Rear of the QFX5700
    ESD Point on the Rear
of the QFX5700
      1
    ESD point
     
  2. Taking care not to touch power supply connections, remove the power supply from its bag.
  3. Peel back and remove the protective plastic wrap that covers all four sides of the power supply.
  4. Ensure that the power switch is set to the standby (O) position. This switch turns off the output voltage; it doesn’t interrupt input power.
  5. Unscrew the captive screw in the counterclockwise direction by using the Phillips (+) screwdriver, number 1.
  6. Rotate the captive screw away from the faceplate of the power supply to release the latch.Note

    You can install the power supplies in any slot labeled PSU 0 through PSU 3 (left to right) on a QFX5700.

  7. Using both hands, place the power supply in the power supply slot on the rear of the system. Slide the power supply straight into the chassis until the power supply is fully seated in the slot. Ensure that the power supply faceplate is flush with any adjacent power supply faceplates or power supply covers.
    Figure 2: Install a power supply
    Install a power supply
  8. Push the captive screw into the power supply faceplate. Ensure that the screw is seated inside the corresponding hole on the faceplate.
  9. Tighten the captive screw by turning it clockwise by using the Phillips (+) screwdriver, number 1. When the screw is completely tight, the latch locks into the switch chassis.
  10. Attach each power cable to a dedicated power source. To get feed redundancy, connect two PSUs to each source. For PSU redundancy, connect each PSU to a same source.
  11. For each power cable, insert the end of the cable with the Anderson connector into the power supply. The connector snaps and locks the cable into position.Warning

    Ensure that the power cords do not block access to switch components or drape where people can trip on them.

  12. If the AC or DC power source outlets have a power switch, set them to the on (|) position.
  13. If the AC power source outlet has a power switch, turn it off before plugging in the AC power cord to the power outlet.
  14. Verify that the LEDs on the power supply faceplate are lit and are on steadily.
  15. Press the power switch to the on (|) position.

Remove a Power Supply

Warning

Protect yourself from severe burns by wearing heat-protective gloves when removing a working power supply from the chassis. These power supplies can reach temperatures between 158°F and 176°F (70°C to 80°C) under running conditions.

Caution

Before you remove a power supply, ensure that you have power supplies sufficient to power the switch left in the chassis.

Before you remove a power supply from the chassis:

  • 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:

    • Heat-protective gloves able to withstand temperatures of 158°F (70°C)

    • Electrostatic discharge (ESD) grounding strap

    • Phillips (+) screwdriver, number 1

    • Replacement power supply or a cover for the power supply slot

Caution

Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover over the empty slot.

To remove a power supply from a QFX5700 switch:

  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 chassis. There is an ESD point located next to the protective earthing terminal and below PSU 3 on the rear of the QFX5700 (see Figure 3).
    Figure 3: ESD Point on the Rear of the QFX5700
    ESD Point on the
Rear of the QFX5700
      1
    ESD point
     
  2. Flip the power (|) switch next to the appliance inlet on the power supply to the standby position (O).
  3. If the AC or DC power source outlets have a power switch, set them to the off (O) position.
  4. Disconnect the Anderson connectors from each input on the power supply faceplate.
  5. Unscrew the captive screw counterclockwise by using the Phillips (+) screwdriver, number 1. See Figure 4.Note

    Ensure that the ejector is fully open to avoid scratching the chassis.

    Figure 4: Remove a Power Supply from a QFX5700
    Remove a Power Supply
from a QFX5700
  6. Rotate the captive screw away from the faceplate of the power supply to release the latch.
  7. Wear heat protective gloves before you remove the power supply from the chassis.
  8. Taking care not to touch the power supply output connections, pins, leads, or solder connections, place one gloved-hand under the power supply to support it. Grasp the power supply handle with your other hand and pull the power supply completely out of the chassis.Caution

    Do not bump the output connections. If the connection hits a solid object, it could damage the power supply.

  9. Place the power supply on an antistatic surface to completely cool before placing the power supply in an antistatic bag for storage.
  10. Install the replacement power supply.Caution

    Use the same type of power supply in all slots. Do not mix power supply models in a production chassis.

Install a Power Supply

Before you install a power supply in the chassis:

  • Ensure that you follow all safety warnings and cautions.

    Warning

    Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off (O) position, and tape the switch handle of the circuit breaker in the off position.

    Warning

    Protect yourself from severe burns by wearing heat-protective gloves when removing a working power supply from the chassis. power supplies can reach temperatures between 158°F and 176°F (70°C to 80°C) under running conditions.

    Caution

    Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

    Caution

    Use the same type of power supply in all slots. Do not mix power supply models in a production chassis.

    Caution

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the QFX5700 switches to earth ground before you connect them to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to earth ground.

    Note

    The battery returns of the power supply must be connected as an isolated DC return (DC-I).

  • 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 to install a DC power supply:

    • Electrostatic discharge (ESD) grounding strap

    • Use high-current cable assembly with the cable lugs (provided) attached.

      The provided terminal lugs are Panduit LCD4-14A-L, or equivalent, and sized for 4 AWG (21.1 mm2) power source cables. The 4 AWG (21.1 mm²) stranded wire should be rated 75° C or per local electrical code. We recommend that you install heat-shrink tubing insulation around the crimped section of the power cables and lugs.

    • 13/32 in. (10 mm) nut driver or socket wrench

    • Phillips (+) screwdrivers, numbers 1 and 2

    • Multimeter

To install a power supply in a QFX5700:

  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 chassis. There is an ESD point located next to the protective earthing terminal and below PSU 3 on the rear of the QFX5700.
    Figure 5: ESD Point on the Rear of the QFX5700
    ESD Point on the Rear of
the QFX5700
      1
    ESD point
     
  2. Taking care not to touch power supply components, pins, leads, or solder connections, remove the power supply from its bag.
  3. Peel back and remove the protective plastic wrap that covers all four sides of the power supply.
  4. Ensure that the power switch is set to the standby (O) position. This switch turns off the output voltage; it doesn’t interrupt DC.
  5. Remove the nuts from each DC power input terminal, using the 13/32 in. (10 mm) nut driver or socket wrench to loosen the nuts.
  6. Ensure that the power source circuit breaker is open so that the voltage across the DC power source cable leads is 0 V. Also ensure that the cable leads don’t become active while you connect DC power.
  7. Verify that the DC power cables are correctly labeled before making connections to the power supply. In a typical power distribution scheme where the return is connected to chassis ground at the battery plant, you can use a multimeter to verify the resistance of the –48V and RTN DC cables to chassis ground:
    • The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–) and will be installed on the –48V (input) DC power input terminal.

    • The cable with very low resistance (indicating a closed circuit) to chassis ground is positive (+) and will be installed on the RTN (return) DC power input terminal.

    Caution

    You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables.

  8. Install each power cable lug on the DC power input terminal, securing it with the nut). Apply between 24 lb-in. (2.7 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut. (Use the 13/32 in. [10 mm] nut driver or socket wrench.)
    1. Secure each positive (+) DC source power cable lug to the RTN (return) DC power input terminal.

    2. Secure each negative (–) DC source power cable lug to the –48V (input) DC power input terminal.

  9. Install the plastic cable cover over each set of power cables by using the Phillips (+) screwdriver, number 2, to tighten the screw.
  10. Unscrew the captive screw in the counterclockwise direction by using the Phillips (+) screwdriver, number 1.
  11. Rotate the captive screw away from the faceplate of the power supply to release the latch.
  12. Using both hands, place the power supply in the power supply slot on the rear of the switch. Slide the power supply straight into the chassis until the power supply is fully seated in the slot.
  13. Push the captive screw into the power supply faceplate. Ensure that the screw is seated inside the corresponding hole on the faceplate.
  14. Tighten the captive screw by turning it clockwise by using the Phillips (+) screwdriver, number 1. When the screw is completely tight, the latch locks into the switch chassis.
  15. Press the power switch to the on (|) position.

Remove a Power Supply

Caution

A working power supply can reach temperatures of up to 158°F and 176°F (70°C to 80°C) under running conditions. In order to avoid injury, do not touch a running power supply with your bare hands.

Caution

Before you remove a power supply, ensure that you have power supplies sufficient to power the switch left in the chassis.

Before you remove a DC power supply from the switch:

  • 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 to remove a power supply:

    • Heat-protective gloves able to withstand temperatures between 158°F to 176°F (70°C to 80°C)

    • Electrostatic discharge (ESD) grounding strap

    • Phillips (+) screwdriver, numbers 1 and 2

    • 13/32 in. (10 mm) nut driver or socket wrench

    • Replacement power supply or a cover for the power supply slot

Caution

Do not leave the power supply slot empty for a long time while the switch is operational. Either replace the power supply promptly or install a cover over the empty slot.

To remove a power supply from a QFX5700 switch:

  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 chassis. There is an ESD point located next to the protective earthing terminal and below PSU 3 on the rear of the QFX5700 (see Figure 6).
    Figure 6: ESD Point on the Rear of the QFX5700
    ESD Point on the Rear of the
QFX5700
      1
    ESD point
     
  2. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.
  3. Ensure that the black power supply output switch, to the right of the captive screw, is set to the standby position.
  4. Unscrew the captive screw counterclockwise by using the Phillips (+) screwdriver, number 1.
  5. Unscrew the captive screw counterclockwise using the Phillips (+) screwdriver, number 1.
  6. Rotate the captive screw away from the faceplate of the power supply to release the latch.
  7. Wear the heat-resistant gloves to protect your hands from the hot power supply.
  8. Taking care not to touch power supply components, pins, leads, or solder connections, place one gloved hand under the power supply to support it. Grasp the power supply handle with your other hand and pull the power supply completely out of the chassis.
  9. If you are not replacing the power supply, install the cover over the slot. To install the cover, insert your thumb and forefinger into the finger holes of the cover, squeeze to retract the spring latches, and place the cover in the slot. Do not run the chassis without a power supply or cover in place.
  10. Unscrew the screw on the plastic cable cover that shields the input terminal studs counterclockwise by using the Phillips (+) screwdriver, number 2.
  11. Unscrew the nuts counterclockwise, using the 13/32 in. (10 mm) nut driver or socket wrench, from the input terminal studs.
  12. Remove the cable lugs from the input terminal studs.