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Connecting the ACX6160 to Power

Connecting the ACX6160 Grounding Cable

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the ACX6160 device to earth ground before you connect it to power.

See Figure 1 for the ACX6160 grounding point.

Figure 1: ACX6160 Grounding PointACX6160 Grounding Point

Before you connect earth ground to the protective earthing terminal of an ACX6160 device, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable.


Using a grounding cable with an incorrectly attached lug can damage the device.


Mount your device in the rack before attaching the grounding lug to the device. See Mounting the ACX6160.

Ensure that you have the following parts and tools available:

  • Grounding cable for your ACX6160 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.

  • Two SAE #10-32 UNF x .31L in. washers and screws—To attach the grounding lug to the protective earthing terminal.

  • Screwdriver to attach the screws.

To connect earth ground to an ACX6160 device:

  1. Attach one end of the grounding cable to an appropriate earth ground site, such as the mounting rack.
  2. Position the grounding lug over the protective earthing terminal on the side of the chassis, which is visible through the mounting bracket.
  3. Secure the grounding lug to the protective earthing terminal with the washers and screws. See Figure 2.
    Figure 2: Connecting a Grounding Cable to an ACX6160 DeviceConnecting a Grounding Cable to an ACX6160 Device
  4. 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.

Connecting DC Power to the ACX6160

Before you begin connecting DC power to the ACX6160:

The ACX6160 is shipped from the factory with two 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 replacement power supplies in the two slots next to the fan modules without powering off the device or disrupting the routing functions.


DC-powered ACX6160 models are intended for installation only in a restricted-access location.


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:

  • ESD grounding strap

  • DC power source cables (14–16 AWG) with ring lug (Molex 190700069 or equivalent) (not provided)

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

  • Multimeter (not provided)


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

To connect DC power to an ACX6160:

  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 approved site 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 (+) and is 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 is installed on the V– (input) DC power input terminal.


    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. 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 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.

  4. Ensure that the power supplies 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 3).
  6. Remove the screws on the terminals using the screwdriver. Save the screws.

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

  7. 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 3 and Figure 4). The ACX6160 is designed to operate with a DC power supply that has a single, nonredundant, feed input. For source redundancy, two DC power supplies must be installed; 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.

    The terminal block of the power supply 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 together, as are the V– terminals.


    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. Use the screwdriver to tighten the screws on the power supply terminals until they are snug. Do not overtighten—apply between 5 lb-in. (0.56 Nm) and 6 lb-in. (0.68 Nm) of torque to the screws.
    Figure 3: DC Power Supply Faceplate for an ACX6160DC Power Supply Faceplate for an ACX6160

    Shunt negative input terminals (+RTN)


    ESD grounding point


    Shunt positive input terminals (-48V)


    Fault(!) LED


    Terminal block


    Output (OUT) LED


    Latch lever


    Input (IN) LED


    The V+ terminals are shunted internally together, as are the V- terminals. Do not connect the terminals to different sources.

    Figure 4: Securing Ring Lugs to the Terminals on the ACX6160 DC Power SupplySecuring Ring Lugs to the Terminals on the ACX6160 DC Power Supply
  8. Replace the terminal block cover.
  9. Close the input circuit breaker.

    The device powers on as soon as power is provided to the power supply. There is no power device on the device.

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