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Removing a hot-swap dc power supply

Use this information to remove a hot-swap dc power supply.

When you remove or install a hot-swap dc power supply, observe the following precautions.

Statement 29

CAUTION: This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit to the earthing conductor at the equipment.

This equipment is designed to permit the connection of the earthed conductor of the dc supply circuit to the earthing conductor at the equipment. If this connection is made, all of the following conditions must be met:
  • This equipment shall be connected directly to the dc supply system earthing electrode conductor or to a bonding jumper from an earthing terminal bar or bus to which the dc supply system earthing electrode conductor is connected.
  • This equipment shall be located in the same immediate area (such as, adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same dc supply circuit and the earthing conductor, and also the point of earthing of the dc system. The dc system shall not be earthed elsewhere.
  • The dc supply source shall be located within the same premises as this equipment.
  • Switching or disconnecting devices shall not be in the earthed circuit conductor between the dc source and the point of connection of the earthing electrode conductor.
Statement 31

DANGER
danger
Electrical current from power, telephone, and communication cables is hazardous.

To avoid a shock hazard:

  • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
  • Connect all power cords to a properly wired and grounded power source.
  • Connect to properly wired power sources any equipment that will be attached to this product.
  • When possible, use one hand only to connect or disconnect signal cables.
  • Never turn on any equipment when there is evidence of fire, water, or structural damage.
  • Disconnect the attached ac power cords, dc power sources, network connections, telecommunications systems, and serial cables before you open the device covers, unless you are instructed otherwise in the installation and configuration procedures.
  • Connect and disconnect cables as described in the following table when you install, move, or open covers on this product or attached devices.
To Connect:To Disconnect:
  1. Turn OFF all power sources and equipment that is to be attached to this product.
  2. Attach signal cables to the product.
  3. Attach power cords to the product.
    • For ac systems, use appliance inlets.
    • For dc systems, ensure correct polarity of -48 V dc connections: RTN is + and -48 V dc is -. Earth ground should use a two-hole lug for safety.
  4. Attach signal cables to other devices.
  5. Connect power cords to their sources.
  6. Turn ON all the power sources.
  1. Turn OFF all power sources and equipment that is to be attached to this product.
    • For ac systems, remove all power cords from the chassis power receptacles or interrupt power at the ac power distribution unit.
    • For dc systems, disconnect dc power sources at the breaker panel or by turning off the power source. Then, remove the dc cables.
  2. Remove the signal cables from the connectors.
  3. Remove all cables from the devices.
Statement 33

CAUTION
This product does not provide a power-control button. Turning off blades or removing power modules and I/O modules does not turn off electrical current to the product. The product also might have more than one power cord. To remove all electrical current from the product, make sure that all power cords are disconnected from the power source.


Statement 34

CAUTION
To reduce the risk of electric shock or energy hazards:
  • This equipment must be installed by trained service personnel in a restricted-access location, as defined by the NEC and IEC 60950-1, First Edition, The Standard for Safety of Information Technology Equipment.
  • Connect the equipment to a properly grounded safety extra low voltage (SELV) source. A SELV source is a secondary circuit that is designed so that normal and single fault conditions do not cause the voltages to exceed a safe level (60 V direct current).
  • Incorporate a readily available approved and rated disconnect device in the field wiring.
  • See the specifications in the product documentation for the required circuit-breaker rating for branch circuit overcurrent protection.
  • Use copper wire conductors only. See the specifications in the product documentation for the required wire size.
  • See the specifications in the product documentation for the required torque values for the wiring-terminal screws.


Important
Before you use the product, be sure to read the multilingual safety instructions at: Lenovo documentation Web site

To remove a hot-swap dc power supply, complete the following steps:

  1. Read the safety information that begins on Safety and Installation guidelines.
  2. If only one power supply is installed, turn off the server and peripheral devices and disconnect all power cords.
  3. If the server is in a rack, at the back of the server, pull back the cable management arm to gain access to the rear of the server and the power supply.
  4. Press and hold the release tab to the left. Grasp the handle and pull the power supply out of the server.
    Figure 1. Power supply removal
    Power supply removal
  5. If you are instructed to return the power supply, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.