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

Use this information to install a 750-watt -48 volt to -60 volt dc power supply.

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 Lenovo ServerProven website.

Attention:

• Only trained service technicians, other than Lenovo 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 two dc power supplies or two ac power supplies in the server, but you cannot mix dc and ac power supplies in the same server.
• 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).
• For the server to support two power supplies, you must install the optional Power Interposer for Redundant Power option or the optional Microprocessor and Memory Expansion Tray, if one is not installed in your model.

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.

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 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.

1. Read the notes at the beginning of this section and read the safety information and installation guidelines, see 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 you:

   1. 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).

   
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.

   

8. Grasp the handle on the rear of the power supply and slide the power supply into the bay 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 the second power supply, place the following power rating label that comes with the power supply option on the rear of the server.

   
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.