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Step 6: Connect Power Cables

Depending on its configuration, the firewall uses either AC or DC power supplies. Perform the appropriate procedures for each power supply in the firewall.

Connect Power to an AC-Powered Firewall

Warning:

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the firewall chassis before connecting power. See Step 4: Connect the Grounding Cable for instructions.

Note:

The device is not shipped with AC power cords. Make sure to order or obtain AC power cords with a plug appropriate for your geographical location.

  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 the SRX5400 Firewall hardware documentation at www.juniper.net/documentation/.
  2. Locate the power cords you will use to connect the device to AC power. See the SRX5400 Firewall hardware documentation at www.juniper.net/documentation/ for specifications.
  3. For each power supply:
    1. Move the power switch on the power supply faceplate to the OFF position (O).
    2. Insert the appliance coupler end of the power cord into the appliance inlet on the power supply (Figure 1).
    3. Insert the power cord plug into an external AC power source receptacle.
      Note:

      Each power supply must be connected to a dedicated AC power feed and a dedicated customer site circuit breaker. We recommend using a 15-A (250-VAC), circuit breaker minimum, or as permitted by local code.

    4. Dress the power cord appropriately. Verify that the power cord does not block the air exhaust or access to firewall components, and that it does not drape where people could trip over it.
      Figure 1: Connecting AC Power to the Firewall Connecting AC Power to the Firewall

Connect Power to a DC-Powered Firewall

This procedure addresses connecting power to firewalls equipped with DC power supplies.

Warning:

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must properly ground the firewall chassis before connecting power. See Step 4: Connect the Grounding Cable for instructions.

Table 1 describes the firewall input voltage requirements.

Table 1: DC Power System Input Voltage

Item

Specification

DC input voltage

Operating range: –40.5 to –72 VDC

  1. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cable leads might become active during installation.
  2. Check the setting of the input mode switch:
    1. Move or remove the metal plate that covers the input mode switch. On some power supply versions, the cover pivots at one end, and you can simply swing it up out of the way. On other versions, the cover is secured with two captive screws that you must loosen.
    2. Use a sharp, nonconductive object to slide the switch to the desired position. Set the input mode switch to position 0 for 60-A input and position 1 for 70-A input. This setting is used by the power management software and must be set on the power supply. See Figure 2.
      Figure 2: DC Power Supply Input Mode SwitchDC Power Supply Input Mode Switch
    3. Restore the metal plate to its original position over the input mode switch.
  3. Secure the power cable lugs to the terminal studs, first with the split washers, then with the nuts as shown in Figure 3. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut. Do not overtighten the nut. (Use a 7/16-in. torque-controlled driver or socket wrench.)
    1. Attach the positive (+) DC source power cable lug to the RTN (return) terminal.
    2. Attach the negative (–) DC source power cable lug to the –48V (input) terminal.
    Figure 3: Connect DC Power CablesConnect DC Power Cables
    CAUTION:

    Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the nuts. Ensure that each nut is properly threaded onto the terminal stud. The nut should be able to spin freely with your fingers when it is first placed onto the terminal stud. Applying installation torque to the nut when it is improperly threaded might result in damage to the terminal stud.

    CAUTION:

    The maximum torque rating of the terminal studs on the DC power supply is 36 lb-in. (4.0 Nm). The terminal studs might be damaged if excessive torque is applied. Use only a torque-controlled driver or socket wrench to tighten nuts on the DC power supply terminal studs.

  4. Connect each DC power cable to the appropriate external DC power source.
    Note:

    For information about connecting to external DC power sources, see the SRX5400 Firewall hardware documentation at www.juniper.net/documentation/.

  5. Switch on the power supply breakers to provide voltage to the DC power source cable leads.

Proceed to Step 7: Perform the Initial Software Configuration.