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 8 lists the wire colors.
Table 8. Direct current cable wire color coding
Color Function
Blue Return
Green / Yellow Ground
Brown -48V
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, so its outputs and
the enclosure become live as soon as power is connected.
The supplied power must meet the input requirements that are listed in Table 9.
Table 9. Direct current 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
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.
The DC power cable must be totally contained in a single rack and must not
extend outside the rack to another rack.
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.
Direct current power replaceable units
The DC power supply model has two replaceable units.
Table 10. Direct current power replaceable units
Description FRU part number Customer replaced
Direct current power supply 00AR231 Y
Direct current power cable 00AR087 Y
The procedure to remove and replace the DC power supply unit is the same as the
AC power supply procedure.
14 Storwize V3700: Quick Installation Guide
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