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Connecting the QFX5220 to Power

Ground the QFX5220-128C

To connect earth ground to a QFX5220-128C:

  1. Use two SAE 10-32 x 0.25 in. screws with number10 split-lock washers (not provided) to secure the grounding lug and attached cable (not provided) to the FRU panel of the chassis. The posts on the grounding lug should point to the right. See Figure 1.
    Figure 1: Connecting a Grounding Cable to a QFX5220-128C Connecting a Grounding Cable to a QFX5220-128C
  2. Connect the remaining end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  3. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.

Connect Power to the QFX5220-128C

The QFX5220-128C is shipped from the factory with four power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running. You can install a replacement power supply in either of the two slots next to the fan modules without powering off the switch or disrupting the switching function.

To connect AC power to a QFX5220-128C:

  1. Attach the grounding strap to your bare wrist and to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
  3. Locate the power cords shipped with the switch; the cords have plugs appropriate for your geographical location.

    For each power supply:

    1. Ensure the loop on the power cord retainer is open and there is enough space to insert the power cord coupler into the inlet. If the loop is closed, press the small tab on the retainer to loosen the loop.
    2. Thread the power cord coupler through the power cord retainer loop.
    3. Insert the power cord coupler firmly into the AC inlet on the power supply faceplate.
    4. Slide the power cord retainer loop towards the power supply until it is snug against the base of the coupler.
    5. Press the tab on the loop and draw out the loop to enclose the power cord. See Figure 2.
    Figure 2: Attaching the Power Cord Retainer Attaching the Power Cord Retainer
    Warning:

    Ensure that the power cord does not block access to device components or drape where people can trip on it.
  4. If the AC power source outlet has a power switch, set it to the OFF (O) position.
    Note:

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.
  5. Insert the power cord plug into an AC power source outlet.
  6. If the AC power source outlet has a power switch, set it to the ON (|) position.
  7. Verify that the AC and DC LEDs on each power supply are lit green.

    If the amber fault LED is lit, remove power from the power supply, and replace the power supply (see How to Remove a Power Supply from a QFX5220). Do not remove the power supply until you have a replacement power supply ready: the power supplies must be installed in the switch to ensure proper airflow.

Ground the QFX5220-32CD and Connect Power

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect the QFX5220 to earth ground before you connect it to power.

For installations that require a separate grounding conductor to the chassis, you must attach a protective earthing terminal bracket on the QFX5220 left front mounting bracket to connect to the earth ground. See Figure 3.

Note:

You must install the QFX5220 in a restricted-access location and ensure that the chassis is always properly grounded. The QFX5220 has a two-hole protective grounding terminal provided on the chassis. Under all circumstances, use this grounding connection to ground the chassis. For AC-powered systems, you must also use the grounding wire in the AC power cord along with the two-hole grounding lug connection. This tested system meets or exceeds all applicable EMC regulatory requirements with the two-hole protective grounding terminal.
CAUTION:

If an external ground connection is required, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the device.
Note:

Mount your switch in the rack or cabinet before attaching the grounding lug to the switch. See Mount a QFX5220-32CD in a Rack or Cabinet by Using the QFX5220-32CD-4PRMK Rack Mount Kit.

Ensure that you have the following parts and tools available:

  • Grounding cable for your QFX5220 device—The grounding cable must be 14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code.

  • Grounding lug for your grounding cable—The grounding lug required is a Panduit LCD10-10A-L or equivalent. The grounding lug attaches to the device chassis through the left-front mounting bracket, providing a protective earthing terminal for the device.

  • Two SAE 10-32 x 0.25 in. screws with number10 split-lock washers—Two screws are used to secure the grounding lug to the protective earthing terminal. These screws and washers are not provided.

  • Number 2 screwdriver.

An AC-powered QFX5220 switch chassis gains additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical location. See AC Power Cord with Type C15 Coupler Specifications.

To connect earth ground to a QFX5220-32CD:

  1. Use the two 10-32 x 0.25 screws with number10 split-lock washers to secure the grounding lug and attached cable to the chassis. Attach the lug through the left mounting bracket to the chassis. See Figure 3.
    Figure 3: Connecting a Grounding Cable to a QFX5220 Connecting a Grounding Cable to a QFX5220
  2. Connect the remaining end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  3. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.

Ground the QFX5220-128C

To connect earth ground to a QFX5220-128C:

  1. Use two SAE 10-32 x 0.25 in. screws with number10 split-lock washers (not provided) to secure the grounding lug and attached cable (not provided) to the FRU panel of the chassis. The posts on the grounding lug should point to the right. See Figure 1.
    Figure 4: Connecting a Grounding Cable to a QFX5220-128C Connecting a Grounding Cable to a QFX5220-128C
  2. Connect the remaining end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  3. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.

Connect Power to the QFX5220-128C

The QFX5220-128C is shipped from the factory with four power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU) when the second power supply is installed and running. You can install a replacement power supply in either of the two slots next to the fan modules without powering off the switch or disrupting the switching function.

To connect AC power to a QFX5220-128C:

  1. Attach the grounding strap to your bare wrist and to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
  3. Locate the power cords shipped with the switch; the cords have plugs appropriate for your geographical location.

    For each power supply:

    1. Ensure the loop on the power cord retainer is open and there is enough space to insert the power cord coupler into the inlet. If the loop is closed, press the small tab on the retainer to loosen the loop.
    2. Thread the power cord coupler through the power cord retainer loop.
    3. Insert the power cord coupler firmly into the AC inlet on the power supply faceplate.
    4. Slide the power cord retainer loop towards the power supply until it is snug against the base of the coupler.
    5. Press the tab on the loop and draw out the loop to enclose the power cord. See Figure 2.
    Figure 5: Attaching the Power Cord Retainer Attaching the Power Cord Retainer
    Warning:

    Ensure that the power cord does not block access to device components or drape where people can trip on it.
  4. If the AC power source outlet has a power switch, set it to the OFF (O) position.
    Note:

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.
  5. Insert the power cord plug into an AC power source outlet.
  6. If the AC power source outlet has a power switch, set it to the ON (|) position.
  7. Verify that the AC and DC LEDs on each power supply are lit green.

    If the amber fault LED is lit, remove power from the power supply, and replace the power supply (see How to Remove a Power Supply from a QFX5220). Do not remove the power supply until you have a replacement power supply ready: the power supplies must be installed in the switch to ensure proper airflow.

Ground the QFX5220-32CD and Connect Power

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect the QFX5220 to earth ground before you connect it to power.

For installations that require a separate grounding conductor to the chassis, you must attach a protective earthing terminal bracket on the QFX5220 left front mounting bracket to connect to the earth ground. See Figure 3.

Note:

You must install the Juniper Product Name in a restricted–access location and ensure that the chassis is always properly grounded. Juniper Product Name have a two–hole protective grounding terminal / Single hole protective grounding terminal provided on the chassis. See the figure below for the location of the earthing terminals on QFX5220. We recommend that you use the chassis protective grounding terminal as the only method for grounding the chassis regardless of the power supply configuration. However, if additional grounding methods are available, you can also use those methods additionally. For example, you can use these additional methods: grounding wire in the power cord of an AC power supply or use the grounding terminal or lug on a DC power supply.

This system was tested to meet or exceed all applicable EMC regulatory requirements with the chassis protective grounding terminal connected correctly.
Figure 6: Connecting a Grounding Cable to a QFX5220-128C Connecting a Grounding Cable to a QFX5220-128C
CAUTION:

If an external ground connection is required, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the device.
Note:

Mount your switch in the rack or cabinet before attaching the grounding lug to the switch. See Mount a QFX5220-32CD in a Rack or Cabinet by Using the QFX5220-32CD-4PRMK Rack Mount Kit.

Ensure that you have the following parts and tools available:

  • Grounding cable for your QFX5220 device—The grounding cable must be 14 AWG (2 mm²), minimum 90° C wire, or as permitted by the local code.

  • Grounding lug for your grounding cable—The grounding lug required is a Panduit LCD10-10A-L or equivalent. The grounding lug attaches to the device chassis through the left-front mounting bracket, providing a protective earthing terminal for the device.

  • Two SAE 10-32 x 0.25 in. screws with number10 split-lock washers—Two screws are used to secure the grounding lug to the protective earthing terminal. These screws and washers are not provided.

  • Number 2 screwdriver.

An AC-powered QFX5220 switch chassis gains additional grounding when you plug the power supply in the switch into a grounded AC power outlet by using an AC power cord appropriate for your geographical location. See AC Power Cord with Type C15 Coupler Specifications.

To connect earth ground to a QFX5220-32CD:

  1. Use the two 10-32 x 0.25 screws with number10 split-lock washers to secure the grounding lug and attached cable to the chassis. Attach the lug through the left mounting bracket to the chassis. See Figure 3.
    Figure 7: Connecting a Grounding Cable to a QFX5220 Connecting a Grounding Cable to a QFX5220
  2. Connect the remaining end of the grounding cable to a proper earth ground, such as the rack in which the switch is mounted.
  3. Dress the grounding cable and ensure that it does not touch or block access to other device components and that it does not drape where people could trip over it.

How to Connect AC Power to a QFX5220

Ensure that you have a power cord appropriate for your geographical location available to connect AC power to the switch.

Before you begin connecting AC power to the switch:

The QFX5220-32CD ships from the factory with two power supplies; the QFX5220-128C ships with four power supplies. Each power supply is a hot-removable and hot-insertable field-replaceable unit (FRU). You can install a replacement power supply in the slots next to the fan modules without powering off the switch or disrupting the switching function.

Note:

Each power supply must be connected to a dedicated power source outlet.

To connect AC power to a QFX5220:

  1. Attach the grounding strap to your bare wrist and to a site ESD point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure. .
  3. Locate the power cords shipped with the switch; the cords have plugs appropriate for your geographical location. See AC Power Cord with Type C15 Coupler Specifications or AC Power Cord with Type C13 Coupler Specifications.

    For each power supply:

    1. Ensure the loop on the power cord retainer is open and there is enough space to insert the power cord coupler into the inlet. If the loop is closed, press the small tab on the retainer to loosen the loop. See Figure 8.
      Figure 8: Attaching the Power Cord Retainer Attaching the Power Cord Retainer
    2. Thread the power cord coupler through the power cord retainer loop.
    3. Insert the power cord coupler firmly into the AC inlet on the power supply faceplate.
    4. Slide the power cord retainer loop towards the power supply until it is snug against the base of the coupler.
    5. Press the tab on the loop and draw out the loop to enclose the power cord. See Figure 8.
    Warning:

    Ensure that the power cord does not block access to device components or drape where people can trip on it.
  4. If the AC power source outlet has a power switch, set it to the OFF (O) position.
    Note:

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.
  5. Insert the power cord plug into an AC power source outlet.
  6. If the AC power source outlet has a power switch, set it to the ON (|) position.
  7. Verify that the AC and DC LEDs on each power supply are lit green.

    If the amber fault LED is lit, remove power from the power supply, and replace the power supply (see How to Remove a Power Supply from a QFX5220). Do not remove the power supply until you have a replacement power supply ready: the power supplies must be installed in the switch to ensure proper airflow.

How to Connect DC Power to a QFX5220-128C

Before you begin connecting DC power to the switch:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

  • Ensure that you have connected the switch chassis to earth ground.

    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).
    Note:

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it 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 the earth ground.

  • Install the power supplies in the chassis. For instructions, follow the instructions in How to Install an AC Power Supply in a QFX5220.

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

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

    • A spare JPSU-1600W-DC-AFO for QFX5220-128C

    • ESD grounding strap

    • Slotted (–) screwdriver, 1/4-in., with a torque range between 6 lb-in (0.68 Nm) to 7 lb-in (0.79 Nm)

      CAUTION:

      You must use an appropriate torque-controlled tool to tighten the screws on the DC power cable connector. Do not overtighten the screws. Applying excessive torque damages the terminal block and the wiring tray. The absolute maximum torque that may be applied to this screw is 10 lb-in (1.13 Nm).

    • Power cables to connect DC power to the QFX5220-128C. The DC power cables–a straight DC power cable (CBL-JNP-PWR-DSUB). See Table 7.

CAUTION:

Do not mix AC and DC power supplies in the same chassis.
Note:

Each power supply must be connected to a dedicated power source outlet.

The DC power supply in a QFX5220-128C is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it without powering off the switch or disrupting switch functions. You do, however, need to remove power from the power supply before attempting to remove the unit.

Warning:

DC-powered QFX5220-128C models are intended for installation only in a restricted access location.

To connect DC power to a QFX5220-128C:

  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 an approved site ESD grounding point.
  2. Ensure that the power supplies are fully inserted in the chassis and that the latches are secure.
  3. Connect the green grounding wire in each DC power cable (CBL-JNP-PWR-DSUB) to ground.
  4. Connect each power supply to the power source by inserting the DC connector into the power supply. See Figure 9 .
    Figure 9: Connecting a Straight DC Power Cable to a DC Power Supply (CBL-JNP-PWR-DSUB) Connecting a Straight DC Power Cable to a DC Power Supply (CBL-JNP-PWR-DSUB)
    Warning:

    Ensure that the power cables do not block access to device components or drape where people can trip on them.
  5. Using the slotted screwdriver, tighten the screws on the power cable connector to between 6 lb-in (0.68 Nm) to 7 lb-in (0.79 Nm).
    CAUTION:

    You must use an appropriate torque-controlled tool to tighten the screws. Applying excessive torque damages the terminal block and the wiring tray. The absolute maximum torque that may be applied to this screw is 10 lb-in (1.13 Nm).
  6. Repeat 4 through 5 for each power supply that you are connecting to power.
  7. Close the input circuit breaker.

    We recommend that the 48 VDC facility DC source be equipped with a circuit breaker rated at 40 A (–48 VDC) minimum, or as required by local code.

    Note:

    We recommend that the 48-VDC facility DC source be equipped with a circuit breaker rated at 40A (-48 VDC) minimum, or as required by local code.
    Note:

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.
  8. Verify that the LED on the power supply is lit green and is on steadily.

    If the status LED is lit amber, remove power from the power supply, and replace the power supply (see How to Remove a Power Supply from a QFX5220). Do not remove the power supply until you have a replacement power supply ready. The power supplies must be installed in the QFX5220-128C to ensure proper airflow.

    CAUTION:

    Replace a failed power supply with a new power supply within 30 seconds of removal to prevent chassis overheating.

How to Connect DC Power to a QFX5220-32CD

Before You Begin

Before you begin connecting DC power to the switch:

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

  • Ensure you have connected the switch chassis to earth ground (see Ground the QFX5220-32CD and Connect Power).

    CAUTION:

    Before you connect power to the switch, a licensed electrician must attach a cable lug to the ground and power cables that you supply (for example, by causing a short circuit).

    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it 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 the earth ground.

  • Install the power supply in the chassis. For instructions on Installing a power supply in a QFX5220, see How to Install an AC Power Supply in a QFX5220.

    Warning:

    A DC-powered QFX5220 is intended for installation only in a restricted access location.

Ensure that you have the following parts and tools available:

  • A spare JPSU-1600W-1UDCAFI or JPSU-1600W-1UDCAFO for QFX5220-32CD (not provided)

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

  • Multimeter (not provided)

Warning:

Connecting DC Power to a QFX5220-32CD

To connect DC power to the DC model QFX5220-32CD:

  1. Attach the grounding strap to your bare wrist and to a site ESD point on the switch.
  2. 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 low resistance (indicating a closed circuit) to chassis ground is positive (+) and will be installed on the V+ (return) DC power input terminal.

    • The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–) and will be installed on the V– (input) 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. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the DC power input terminals on each power supply.
  3. Install heat-shrink tubing insulation around the power cables.

    To install heat-shrink tubing:

    1. Slide the tubing over the portion of the cable where it is attached to the lug barrel. Ensure that tubing covers the end of the wire and the barrel of the lug attached to it.

    2. Shrink the tubing with a heat gun. Ensure that you heat all sides of the tubing evenly so that it shrinks around the cable tightly.

    Figure 10 shows the steps to install heat-shrink tubing.

    Note:

    Do not overheat the tubing.
    Figure 10: How to Install Heat-Shrink Tubing How to Install Heat-Shrink Tubing
  4. Ensure that the input circuit breaker is open so that the voltage across the DC power source cable leads is 0 V and that the cable leads do not become active while you are connecting DC power. The QFX5220-32CD-D should connect the power supplies to an external DC power source, or an -0% to +20% tolerance DC mains, supplied with a NRTL-approved circuit breaker rated at 40-A.
    Note:

    The V+ terminals are referred to as +RTN, and V– terminals are referred to as –48 V in DC Power Wiring Sequence Warning and DC Power Electrical Safety Guidelines.
  5. Ensure that the power supplies are fully inserted in the chassis.
  6. Remove the terminal block cover. The terminal block cover is a piece of clear plastic that snaps into place over the terminal block (see Figure 11).
    Figure 11: Removing Terminal Block Cover Removing Terminal Block Cover
  7. Remove the screws on the terminals using the screwdriver. Save the screws. See Figure 12.
    Figure 12: QFX5220-32CD Faceplate QFX5220-32CD Faceplate
      1
    —

    Not used

      4
    —

    Release latch

      2
    —

    Handle

      5
    —

    V– terminal

      3
    —

    LEDs

      6
    —

    V+ terminal
  8. Connect each power supply to the power sources. Secure power source cables to the power supplies by screwing the ring lugs attached to the cables to the appropriate terminals by using the screw from the terminals (see Figure 13).
    Figure 13: Securing Ring Lugs to the Terminals on the QFX5220-32CD DC Power Supply Securing Ring Lugs to the Terminals on the QFX5220-32CD DC Power Supply

    The QFX5220-32CD is designed to operate with a DC power supply that has a single, non-redundant, feed input. For source redundancy, two DC power supplies must be installed in the QFX5220-32CD; connect source (A) to one power supply and connect source (B) to the second power supply. This configuration provides the commonly deployed A/B feed redundancy for the system.

    CAUTION:

    The connection between each power source and power supply must include a circuit breaker.

    Do not connect two sources to a single power supply because doing so can potentially cause circulating current in feed wires whenever there is any difference in the voltage of the two sources.
    1. Secure the ring lug of the positive (+) DC power source cable to the V+ terminal on the DC power supply.
    2. Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC power supply.
    3. Tighten the screws on the power supply terminals until snug using the screwdriver. Do not overtighten—apply between 5 in-lb (0.56 Nm) and 6 in-lb (0.68 Nm) of torque to the screws.
    Warning:

    Ensure that the power cables do not block access to device components or drape where people can trip on them.
  9. Replace the terminal block cover.
  10. Close the input circuit breaker.
    Note:

    The switch powers on as soon as power is provided to the power supply. There is no power switch on the device.
  11. Verify that the IN and OUT LEDs on the power supply are lit green and are on steadily.

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