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5-9
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-06
Chapter 5 Installing Power Supply Units
Connecting a DC Power Supply Unit to DC Power Sources
Figure 5-5 Connecting DC Power to a 3-kW DC Power Supply Unit with 3-kW Power Redundancy
If the power supply unit is too far for a 4.6-meter (15 foot) power cable to reach, then you need to install
a power interface unit (PIU) in a rack where the power cable can connect it to the power supply unit (see
the “Connecting a Power Supply Unit to DC Power Sources though a Power Interface Unit” section on
page 5-11).
Note The power cables required for each DC power supply unit are shipped with the DC power supply unit.
If you do not have the correct cables, contact Cisco TAC.
Warning
Read the installation instructions before connecting the system to the power source.
Statement 1004
To connect the DC power supply unit directly to DC power sources, follow these steps:
Step 1 Turn the power switch to standby (STBY) for the power supply unit that you are connecting.
Step 2 Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting
to.
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
1 Separate DC power grids 3 DC power supply unit
2 Isolated inputs from DC power grid 4 Two plugs, each with two isolated inputs from
separate DC power grids
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