Cisco Nexus 7000 Series Hardware Installation And Reference Manual page 141

Chapter 5 Installing Power Supply Units
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
Figure 5-5
1 Separate DC power grids
2 Isolated inputs from DC power grid
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).
The power cables required for each DC power supply unit are shipped with the DC power supply unit.
Note
If you do not have the correct cables, contact Cisco TAC.
Read the installation instructions before connecting the system to the power source. Statement 1004
Warning
To connect the DC power supply unit directly to DC power sources, follow these steps:
Turn the power switch to standby (STBY) for the power supply unit that you are connecting.
Step 1
Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting
Step 2
to.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003
OL-23069-06
Connecting DC Power to a 3-kW DC Power Supply Unit with 3-kW Power Redundancy
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
Connecting a DC Power Supply Unit to DC Power Sources
3 DC power supply unit
4 Two plugs, each with two isolated inputs from
separate DC power grids
5-9