Note: The connection to the DC power source must be made by trained service
personnel. Ensure that the connection is made in accordance with all the
requirements of the equipment that is being used.
Use the supplied cables to connect the DC PSUs to the power sources. Use only
the IBM supplied DC power cable (IBM part number 00AR087) to connect the unit
to a DC power source.
The supplied power must meet the input requirements that are listed in Table 9.
Table 9. DC power supply input requirements
Requirement Min Max
Voltage (V DC) -48 -60
Instantaneous (V DC for < 1 second) -36 -75
Inrush current at initial turn on (-48V DC) 34 A
Out of spec time before power off is signaled 5 ms
Important: Each PSU cable must be protected by a 20A circuit breaker. These
instructions assume that the circuit breaker is separate from the DC power
distribution unit. Refer to the DC power distribution unit documentation and the
circuit breaker documentation for details. Follow the instructions that are given
there for connecting the circuit breaker to the power distribution unit and for
connecting the DC power cable to the circuit breaker.
One end of the cable ends in a plug that fits the DC PSU. At the other end of the
cable, each individual wire ends with a 6 mm diameter ring terminal that is
designed to fit an M6 stud. Provide adequate strain relief after you attach the ring
terminals to the power source. Table 10 lists the wire colors.
If it is necessary to replace the ring terminals with a different connector, choose a
suitably sized and rated UL-listed connector that is appropriate for the wire gauge
and available current. Install the ring terminals according to the instructions
provided by the manufacturer.
Table 10. DC cable wire color coding
Color Function
Blue Return
Green / Yellow Ground
Brown -48V
Securing the power cables
The DC power cable must be contained in a single rack and must not extend
outside the rack to another rack. The DC power cable is 4 m long. Connect it to the
DC power source before you connect it to the PSU. The PSU does not have a
power switch. When power is connected, the outlets and the enclosure become
live. Review the information on securing the power cables to ensure that the cables
are securely attached to the enclosure.
Direct current power replaceable units
The DC power supply model has two replaceable units.
14 Storwize V5000 Gen2: Quick Installation Guide
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