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Step 4: Connect Power Cables

Depending on the configuration, your router uses either AC or DC power supply modules (PSMs). Perform the appropriate procedures for each PSM in your router. The PSMs are hot-insertable and are field-replaceable units (FRUs). The ACX5400 routers use two PSMs, which install in the rear of the chassis in the slots provided.

Warning:

You must ground the router before connecting either the AC power cord or the DC power cable.

CAUTION:

Do not mix AC and DC PSMs in the same chassis. Similarly, do not mix components with different airflow (AFO and AFI) in the same chassis.

Connect Power to an AC Router

Table 1 provides the AC power system input voltage for the ACX5400 routers.

Table 1: ACX5400 AC Power System Input Voltage

Item

Specification

AC input voltage

Operating range: 100–240 VAC

To connect AC power to an ACX5448 router:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  2. Power off the AC input appliance inlet on the source power supply.
  3. Connect the power cord to the power source outlet.
    Note:

    Each PSM must be connected to a dedicated AC power feed and a dedicated customer-site 2-pole circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 20 A (110 VAC) or 16 A (220 VAC) minimum, or as required by local code.

  4. Push the end of the AC power cord retainer strip into the hole next to the inlet on the PSM faceplate on the router until it snaps into place. Ensure that the loop in the retainer strip faces toward the power cord.

    Figure 1 shows the port on the AC PSM for an ACX5448 router where the power cord retainer is installed.

    Figure 1: Power Cord Retainer Port on the AC PSM for ACX5448Power Cord Retainer Port on the AC PSM for ACX5448
      1
    —

    Input status LED

      4
    —

    Ejector lever

      2
    —

    Output status LED

      5
    —

    AC power cord retainer port

      3
    —

    Fault LED

    		 

    Figure 2 shows the power cord retainer installed on the AC PSM for ACX5448 router.

    Figure 2: Power Cord Retainer Installed on the AC PSM for ACX5448Power Cord Retainer Installed on the AC PSM for ACX5448
      1
    —

    Input status LED

      4
    —

    AC power cord retainer installed

      2
    —

    Output status LED

      5
    —

    Ejector lever

      3
    —

    Fault LED

    		 
  5. Press the small tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the power cord coupler into the inlet.
  6. Insert the power cord coupler firmly into the inlet.
  7. Slide the loop toward the PSM until the loop is snug against the base of the coupler.
  8. Press the tab on the loop and draw out the loop into a tight circle (see Figure 3).
  9. Route the power cord appropriately. Verify that the power cord does not block the air exhaust and access to router components, or drape where people could trip over it.
  10. Power on the source power supply.
  11. Repeat Step 3 through Step 9 for the installing the remaining PSM.
Figure 3: Connect an AC Power Cord to the ACX5448 RouterConnect an AC Power Cord to the ACX5448 Router

To connect AC power to an ACX5448-D or ACX5448-M router:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.

  2. Power off the AC input appliance inlet on the source power supply.

  3. Connect the power cord to the source power supply. Insert the coupler end of the power cord into the AC power cord inlet on the AC power supply faceplate.

    Note:

    Each PSM must be connected to a dedicated AC power feed and a dedicated customer-site 2-pole circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 20 A (110 VAC) or 16 A (220 VAC) minimum, or as required by local code.

  4. Push the power cord retainer onto the power cord.

    Figure 4 shows the power cord retainer installed on the AC PSM for the ACX5448-D router and Figure 5 shows how to connect an AC power cord to an ACX5448-D router.

    Figure 4: Power Cord Retainer Installed on the AC PSM for ACX5448-D or ACX5448-MPower Cord Retainer Installed on the AC PSM for ACX5448-D or ACX5448-M
      1
    —

    Input status LED

      4
    —

    AC power cord retainer installed

      2
    —

    Output status LED

      5
    —

    Ejector lever

      3
    —

    Fault LED

    		 
    Figure 5: Connect an AC Power Cord to the ACX5448-D or ACX5448-M RouterConnect an AC Power Cord to the ACX5448-D or ACX5448-M Router

  5. Power on the power supply at source.

Connect Power to a DC Router

Table 2 gives the DC power system input voltage for ACX5400 routers.

Table 2: ACX5448, ACX5448-D, and ACX5448-M DC Power System Input Voltage

Item

Specification

DC input voltage (ACX5448)

Rated operating voltage: –48 VDC to –60 VDC

Operating voltage range: –40.8 VDC through –72 VDC

DC input voltage (ACX5448-D)

Rated operating voltage: –48 VDC to –60 VDC

Operating voltage range: –43.2 VDC through –72 VDC

DC input voltage (ACX5448-M)

Rated operating voltage: –48 VDC to –60 VDC

Operating voltage range: –43.2 VDC through –72 VDC

To connect DC power to an ACX5400 router:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  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 (+). You install this cable on the V+ (return) DC power input terminal.

    • The cable with very high resistance (indicating an open circuit) to chassis ground is negative (–). You install this cable 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 PSM.

  3. Ensure that the input 2-pole 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.
    Note:

    The V+ terminals are referred to as +RTN, and V– terminals are referred to as –48 V in DC Power Wiring Sequence Warning.

  4. Ensure that the DC PSMs are fully inserted in the chassis.
  5. 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 6).
  6. Remove the screws on the terminals by using the screwdriver. Save the screws.
    Warning:

    Ensure that the power cables do not block access to device components or drape where people can trip over them.

  7. Connect each PSM to the power sources. Secure power source cables to the PSMs by screwing the ring lugs attached to the cables to the appropriate terminals by using the screw from the terminals (see Figure 6).

    The ACX5400 router is designed to operate with a DC power supply that has a single, non-redundant, feed input. For source redundancy, you must install two DC PSMs in the ACX5400; connect source (A) to one PSM and connect source (B) to the second PSM. This configuration provides the commonly deployed A/B feed redundancy for the system.

    The terminal block of the PSM has four terminals labeled V+, V+, V–, and V– for connecting DC power source cables labeled positive (+) and negative (–). The V+ terminals are shunted internally, as are the V— terminals.

    CAUTION:

    The connection between each power source and PSM must include a 2-pole circuit breaker.

    Do not connect two sources to a single PSM 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 PSM.
    2. Secure the ring lug of the negative (–) DC power source cable to the V– terminal on the DC PSM.
    3. Tighten the screws on the PSM 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.
    CAUTION:

    The V+ terminals are shunted internally, as are the V– terminals. The same polarity terminal can be wired together from the same source to provide an additional current path in a higher power chassis. Do not connect the terminals to different sources.

    Figure 6: Connect a DC Power Cable to an ACX5400 RouterConnect a DC Power Cable to an ACX5400 Router
  8. Replace the terminal block cover.
  9. Close the input 2-pole 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.

  10. Verify that the IN and OUT LEDs on the power supply are lit green and are on steadily.
    CAUTION:

    A system reboot with Routing Engine FPGA version 7.1 might not successfully boot the Junos OS software. In case of a system reboot failure, you need to power cycle the switch. To check the current FPGA version, issue the show chassis firmware command.