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Connect ACX5448, ACX5448-D, and ACX5448-M to Power

Connect Earth Ground to ACX5400 Routers

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must ground the router properly before connecting power. The ACX5400 routers have a separate protective earthing terminal provided on the chassis and on the DC power supply module (PSM) in addition to the grounding pin of the AC PSM cord.

To connect earth ground to ACX5400 routers, see Connect Earth Ground to ACX5400 Chassis. To connect earth ground to the DC PSM protective earthing terminal, see Connect Earth Ground to DC PSM Protective Earthing Terminal.

You must install a ACX5400 series router in a restricted-access location and ensure that the chassis is always properly grounded. An ACX5400 series router has a two-hole protective grounding terminal provided on the chassis. See Figure 1, Figure 2, and Figure 3. 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.

Connect Earth Ground to ACX5400 Chassis

Before you connect earth ground to the protective earthing terminal of a ACX5400 router, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable.

Figure 1, Figure 2, and Figure 3 show the grounding points on ACX5400 routers.

Figure 1: Grounding Points on the ACX5448 RouterGrounding Points on the ACX5448 Router
Figure 2: Grounding Points on the ACX5448-D RouterGrounding Points on the ACX5448-D Router
Figure 3: Grounding Points on the ACX5448-M RouterGrounding Points on the ACX5448-M Router
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Grounding points

 

You need a protective earthing terminal bracket for connecting the chassis to earth ground. This two-holed bracket attaches on the side of the chassis through the mounting rail and provides a protective earthing terminal for the router. The grounding points are in the form of studs sized for #10–32 pan head screws. (You need to provide these screws with integrated washers as we do not ship them in the accessory kit). The grounding points are spaced at 0.63-in. (16-mm) centers.

You ground the router by connecting one end of a grounding cable to earth ground and then attaching the other end to the chassis grounding points by using two #10–32 pan head screws. You must provide the grounding cables.

Note:

The grounding lug required is a Panduit LCD10-10A-L or equivalent (not provided). The grounding lug accommodates 12 AWG (2.5 mm²) stranded wire. The grounding cable that you provide for the chassis must be the same size or heavier than the input wire of each power supply. Minimum recommendations are 12 AWG (2.5 mm²) stranded wire, 60° C wire for the ACX5448 router and 12 AWG (2.5 mm²), 90° C temperature-rated stranded wire for the ACX5448-D and ACX5448-M routers.

To ground the ACX5400 router:

  1. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
  2. Ensure that all grounding surfaces are clean and brought to a bright finish before grounding connections are made.
  3. Connect the grounding cable to a proper earth ground.
  4. For ACX5448-M routers, remove the dummy screws from the grounding point (see Figure 5).
  5. Place the grounding cable lug over the grounding points on the side of the chassis (see Figure 4 for ACX5448 and ACX5448-D routers and Figure 5 for the ACX5448-M router).
    Figure 4: Connect the Grounding Cable to the ACX5448 or ACX5548-D RouterConnect the Grounding Cable to the ACX5448 or ACX5548-D Router
    Figure 5: Connect the Grounding Cable to the ACX5448-M RouterConnect the Grounding Cable to the ACX5448-M Router
  6. Secure the grounding cable lug with the screws. The holes are sized to accommodate #10–32 pan head screws.
  7. Dress the grounding cable and verify that it does not touch or block access to router components, and that it does not drape where people could trip over it.

Connect Earth Ground to DC PSM Protective Earthing Terminal

You attach the protective earthing terminal lug to the DC PSM protective earthing terminal to provide a protective earthing connection. The protective earthing terminal is in the form of a stud that can accommodate an M5 pan head screw of length 0.8 mm. (You need to provide these screws with integrated washers as we do not ship them in the accessory kit).

Figure 6 shows the protective earthing terminal on the DC PSM.

Figure 6: Protective Earthing Terminal on the DC PSMProtective Earthing Terminal on the DC PSM
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Protective earthing terminal

 

You ground the DC PSM protective earthing terminal by connecting one end of a grounding cable to earth ground and then attaching the other end to the protective earthing terminal on the DC PSM by using an M5 pan head screw. You must provide the grounding cables.

Note:

The protective earthing terminal lug accommodates 12 AWG (2.5 mm²) standard wire. The grounding cable that you provide for the protective earthing terminal of the DC PSM must be of the same size or heavier than the input wire of each PSM. The minimum recommendations for the ACX5400 router are 12AWG (2.5 mm²) standard wire, 90° C wire.

To ground the chassis using the protective earthing terminal on the DC PSM:

  1. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
  2. Ensure that all grounding surfaces are clean and brought to a bright finish before grounding connections are made.
  3. Connect the grounding cable to a proper earth ground.
  4. Place the grounding cable lug over the protective earthing terminal on the DC PSM.
  5. Secure the grounding cable lug with the M5 pan head screw (see Figure 7).
    Figure 7: Connect the Grounding Cable to the Protective Earthing Terminal on the DC PSMConnect the Grounding Cable to the Protective Earthing Terminal on the DC PSM
  6. Dress the grounding cable and verify that it does not touch or block access to router components, and that it does not drape where people could trip over it.

Connect AC Power to an ACX5400 Router

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

Before you begin connecting AC power to the router:

  • 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 router chassis to earth ground.

    CAUTION:

    Before you connect power to the router, 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 router (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. Under all circumstances, use the protective earthing terminal on the router chassis to connect to the earth ground. The router gains additional grounding when you plug the PSM in the router to a grounded AC power outlet by using the AC power cord appropriate for your geographical location.

  • Install the PSM in the chassis.

The power supply module (PSM) in an ACX5400 router is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it without powering off the router or disrupting routing functions.

Note:

You must connect each PSM to a dedicated power source outlet.

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 power supply 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 power supply faceplate on the router until it snaps into place. Ensure that the loop in the retainer strip faces toward the power cord.

    Figure 8 shows the port on the AC PSM for ACX5448 router where the power cord retainer is installed.

    Figure 8: Power Cord Retainer Port on the AC PSMPower Cord Retainer Port on the AC PSM
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    Input status LED

      4
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    Ejector lever

      2
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    Output status LED

      5
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    AC power cord retainer port

      3
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    Fault LED

    		 

    Figure 9 shows the power cord retainer installed on the AC PSM for ACX5448 router.

    Figure 9: Power Cord Retainer Installed on the AC PSM for ACX5448Power Cord Retainer Installed on the AC PSM for ACX5448
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    Input status LED

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    AC power cord retainer installed

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    Output status LED

      5
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    Ejector lever

      3
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    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 it 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 10).
  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 10: Connect an AC Power Cord to an ACX5448Connect an AC Power Cord to an ACX5448

To connect AC power to ACX5448-D and ACX5448-M routers:

  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.

    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 11 shows the power cord retainer installed on the AC PSM for the ACX5448-D and ACX5448-M router and Figure 12 shows how to connect an AC power cord to an ACX5448-D or ACX5448-M router.

    Figure 11: Power Cord Retainer Installed on the AC PSM for ACX5448-D and ACX5448-MPower Cord Retainer Installed on the AC PSM for ACX5448-D and ACX5448-M
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    Input status LED

      4
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    AC power cord retainer installed

      2
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    Output status LED

      5
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    Ejector lever

      3
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    Fault LED

    		 
    Figure 12: : Connect an AC Power Cord to an ACX5448-D or ACX5448-M router: Connect an AC Power Cord to an ACX5448-D or ACX5448-M router

  5. Power on the power supply at source.

Connect DC Power to an ACX5400 Router

Before you begin connecting DC power to the router:

  • 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 router chassis to earth ground.

    CAUTION:

    Before you connect power to the router, 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 router (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 router chassis to connect to the earth ground. .

  • Install the PSM in the chassis.

Ensure that you have the following parts and tools available:

  • DC power source cables 12 AWG with ring lug (Molex 190700069 or equivalent)(not provided)

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

  • Multimeter (not provided)

The power supply module (PSM) in an ACX5400 router is a hot-removable and hot-insertable field-replaceable unit (FRU). You can remove and replace it without powering off the router or disrupting routing functions.

Warning:

DC-powered ACX5400 routers are intended for installation only in a restricted-access location.

Note:

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

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. 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 13 shows the steps to install heat-shrink tubing.

    Note:

    Do not overheat the tubing.
    Figure 13: How to Install Heat-Shrink Tubing How to Install Heat-Shrink Tubing
  4. 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.
  5. Ensure that the PSMs 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 14).
  7. 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.
  8. 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 14).

    The ACX5400 router is designed to operate with a DC PSM 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.
  9. Replace the terminal block cover.
  10. Close the input 2-pole circuit breaker.
    Note:

    The switch powers on as soon as power is provided to the PSM. There is no power switch on the device.
  11. Verify that the IN and OUT LEDs on the PSM 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.
Figure 14: Connect DC Power Cable to an ACX5400 RouterConnect DC Power Cable to an ACX5400 Router