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5-11
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
Connecting a Power Supply Unit to DC Power Sources though a Power
Interface Unit
If the DC power supply units and the DC power sources are located too far apart for you to connect them
with the 4.6-meter (15-foot) power cables, then you need to install a power interface unit (PIU) between
the power supply units and the power sources. You must install the PIU close enough to the power supply
units so that you can connect the two with the 4.6-meter power cable.
To connect a DC power supply unit to a distant DC power source, you must connect two or four sets of
isolated inputs from the DC power grid to two or four sets of contacts on the PIU and connect the
matching sets of contacts on the PIU with the DC power source using another power cable. For 3 kW of
output power from the power supply unit, you connect two isolated inputs through one plug to the power
supply unit (see Figure 5-6). For 6 kW of output power, you connect four isolated inputs through two
plugs to the power supply unit (see Figure 5-7). For 3 kW of output power with input source redundancy,
you connect the two plugs, each connected to a different DC power grid (see Figure 5-8).
Figure 5-6 Connecting DC Power to a 3-kW DC Power Supply Unit
1 DC power grid 4 DC power supply unit
2 Isolated inputs from DC power grid 5 Plug with two isolated inputs
3 PIU
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