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Safety precautions

The section lists safety precautions that apply to AC and DC power supply units respectively. Understand and apply the safety precautions before removing or installing a power supply unit.

Safety precautions for AC power supplies​

The following tips describe the information that you must consider when you replace an AC power supply.

S035
shock hazard
CAUTION

Never remove the cover on a power supply or any part that has this 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.

S002
disconnect all power
CAUTION
The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.
S001
shock hazard
DANGER
danger
Electrical current from power, telephone, and communication cables is hazardous.

To avoid a shock hazard:

  • Connect all power cords to a properly wired and grounded electrical outlet/source.
  • Connect any equipment that will be attached to this product to properly wired outlets/sources.
  • 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.
  • The device might have more than one power cord, to remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

Safety precautions for DC power supplies​

The following tips describe the information that you must consider when you replace a DC power supply.

CAUTION

240 V DC warning statement

240 V DC input (input range: 180-300 V) is supported in Chinese Mainland ONLY.

Perform the following steps to safely remove the power cord of one 240 V DC power supply unit. Otherwise, there can be data loss and other damages to the equipment. Damages and losses resulting from inappropriate operations will not be covered by the manufacturer’s warranty.

  1. Turn off the server.

  2. Disconnect the power cord from the power source.

  3. Disconnect the power cord from the power supply unit.

S035
shock hazard
CAUTION

Never remove the cover on a power supply or any part that has this 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.

S019
shock hazard
CAUTION
The power-control button on the device does not turn off the electrical current supplied to the device. The device also might have more than one connection to dc power. To remove all electrical current from the device, ensure that all connections to dc power are disconnected at the dc power input terminals.
S029

DANGER
danger
For -48V dc power supply, electrical current from power cables is hazardous.

To avoid a shock hazard:

  • To connect or disconnect -48V dc power cables when you need to remove/install redundancy power supply unit(s).
To Connect:To Disconnect:
  1. Turn OFF subject dc power source(s) and equipment(s) that are attached to this product.
  2. Install the power supply unit(s) into the system housing.
  3. Attach dc power cord(s) to the product.
    • Ensure correct polarity of -48 V dc connections: RTN is + and -Vin (typical 48 V dc) is -. Earth ground should be connected very well.
  4. Connect dc power cord(s) to subject power source(s).
  5. Turn ON all the power source(s).
  1. Disconnect or turn off the subject dc power source(s) (at the breaker panel) before removing the power supply unit(s).
  2. Remove the subject dc cord(s) and make sure the wire terminal of power cord(s) is insulated.
  3. Unplug the subject power supply unit(s) from the system housing.