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Installing a 750-watt -48 volt to -60 volt dc power supply

Use this information for considerations that you need note when you install 750-watt -48 volt to -60 volt dc power supplies and the instructions for installing the 750-watt -48 volt to -60 dc power supplies in the server.

Note
  • This information apply to both the 4-socket and 8-socket servers.
  • Four 750-watt -48 dc power supplies is the only 750-watt -48 volt dc power supply configuration that the server supports (per 4-socket node).
  • Four 750-watt hot-swap power supplies fed from a -48 volt to -60 volt dc input source provides N+N redundancy support for limited configurations.
  • For more notes and information that you must consider when you install power supplies in the server, see Installing power supplies.

The following notes provides information that you must consider when you install a 750-watt -48 V to -60 V dc power supply. To confirm that the server supports the power supply that you are installing, see the Lenovo ServerProven website.

Attention:
  • Only trained service technicians, other than Lenovo approved service technicians, are authorized to install and remove the 750-watt -48 V to -60 V dc power supply, and make connections to or disconnections from the 750-watt -48 V to -60 V dc power source.
  • Lenovo service technicians are not certified or authorized to install or remove the 750-watt -48 V to -60 V dc power cable. You are responsible for ensuring that only a trained service technician install or remove the 750-watt -48 V to -60 V dc power cable.
  • You can install up to four dc power supplies (per 4-socket node) or four ac power supplies (per 4-socket node) in the server, but you cannot mix dc and ac power supplies in the same server.
  • The power supply bays are divided into two power domains (each 4-socket node). Power supply bays 1 and 3 are in power domain A and power supply bays 2 and 4 are in power domain B.
  • To reduce the risk of electric shock or energy hazards when installing the 750-watt -48 V to -60 V dc power supplies, take the following steps:
    • Use a circuit breaker that is rated 40 amps.
    • Use 4 mm2 (10 AWG) at 60° C copper wire.
    • Cut the power cable wires to the correct length, but do not cut the wires shorter than 150 mm (6 inches).
    • Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31 inch-pounds).
Statement 8

CAUTION
Never remove the cover on a power supply or any part that has the following label attached.

Hazardous voltage, current, and energy levels are present inside any component that has this label attached. There are no serviceable parts inside these components. If you suspect a problem with one of these parts, contact a service technician.







Note
These instructions apply to both the 4-socket and 8-socket servers.

To install a 750-watt -48 V to -60 V dc power supply, complete the following steps:

Note
Only trained service technicians, other than Lenovo approved service technicians, are authorized to install and remove the 750-watt -48 V to -60 V dc power supply, and make connections to or disconnections from the 750-watt -48 V to -60 V dc power source. Lenovo approved service technicians are not certified or authorized to install or remove the 750-watt -48 V to -60 V dc power cable. You are responsible for ensuring that only a trained service technician install or remove the 750-watt -48 V to -60 V dc power cable.
  1. Before you begin, read the notes at the beginning of this section, Safety, and Installation guidelines.
  2. Turn off the server (see Turning off the server) and all attached peripheral devices. Disconnect all external cables from the server.
    Attention
    When you handle static-sensitive devices, take precautions to avoid damage from static electricity. For details about handling these devices, see Handling static-sensitive devices.
  3. Turn off the circuit breaker(s) for the dc power supplies.
    Note
    Make sure that you use a circuit breaker that is rated 40 amps.
  4. Remove the power-supply filler panel from the power-supply bay where you are installing the power supply. Save the filler for later use.
  5. Touch the static-protective package that contains the power supply to any unpainted metal surface on the server; then, remove the power supply from the package and place it on a static-protective surface.
  6. Attach the dc power cable to the new power supply. Make sure that the power cable wires are connected securely to the -48 V, ground, and to the -48 V return terminals (as shown in the following illustration). Make sure that:
    1. You use 4 mm2 (10 AWG) at 60° C copper wire.
    2. Cut the power cable wires to the correct length, but do not cut the wires shorter than 150 mm (6 inches).
    3. Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31 inch-pounds).

    Illustration that shows the cabling of the power supplies
  7. Insert the power-supply spacer into the left side of the power-supply bay (against the bay wall) and slide it in until it snaps into place on the tabs on the side of the power supply bay.

    Illustration of the power supply installation
  8. Grasp the handle on the rear of the power supply and slide the power supply into the bay (next to the spacer) until it clicks into place and is seated firmly into the connector.
  9. Connect the other ends of the dc power cable to the dc power source.
    Note
    When you install additional power supplies, place the following power rating label that comes with the power supply option on the rear of the server.

    Illustration of the power supply rating label
  10. Turn on the circuit breaker(s) for the dc power supplies.
  11. Route the power cable through the cable hook-and-loop on the rear of the server so that it does not accidentally become unplugged.
  12. Reconnect all of the cables to the peripheral devices.
  13. Restart the server. Make sure that it starts correctly and recognizes the newly installed device, and make sure that no error LEDs are lit.