Direct current power supply units

Some Storwize® V3700 enclosure models run in a direct current (DC) power environment rather than the alternating current (AC) environment required by the other models in the range.

This topic describes the additional information you need to know when using the DC power models.

DANGER
Hazardous voltage, current, or energy levels are present inside any component that has this label attached. Do not open any cover or barrier that contains this label. (L001)
DANGER
When working on or around the system, observe the following precautions:

Electrical voltage and current from power, telephone, and communication cables are hazardous. To avoid a shock hazard:

  • If IBM® supplied a power cord(s), connect power to this unit only with the IBM provided power cord. Do not use the IBM provided power cord for any other product.
  • Do not open or service any power supply assembly.
  • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
  • The product might be equipped with multiple power cords. To remove all hazardous voltages, disconnect all power cords.
  • Connect all power cords to a properly wired and grounded electrical outlet. Ensure that the outlet supplies proper voltage and phase rotation according to the system rating plate.
  • Connect any equipment that will be attached to this product to properly wired outlets.
  • 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 power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures.
  • Connect and disconnect cables as described in the following procedures when installing, moving, or opening covers on this product or attached devices.

    To disconnect:

    1. Turn off everything (unless instructed otherwise).
    2. Remove the power cords from the outlets.
    3. Remove the signal cables from the connectors.
    4. Remove all cables from the devices.

    To connect:

    1. Turn off everything (unless instructed otherwise).
    2. Attach all cables to the devices.
    3. Attach the signal cables to the connectors.
    4. Attach the power cords to the outlets.
    5. Turn on the devices.
  • Sharp edges, corners and joints may be present in and around the system. Use care when handling equipment to avoid cuts, scrapes and pinching. (D005)

Statement 19:

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.

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.
Note: In Statement 34 above:
  • Replace IEC 60950-1, First Edition with IEC 60950-1, Second Edition Amendment 1.
  • The required circuit breaker rating is 20 amps.