Connecting A 6-Kw Dc Power Supply To A Dc Power Source - Cisco Nexus 7000 Hardware Installation And Reference Manual

Chapter 6 Installing Power Supplies
Turn the power switch on the connected DC power supplies from standby to on (from 0 to 1 as labelled
Step 8
on the power switch for each power supply). The LEDs should flash and then the Output LED should
turn on in addition to the Input LEDs.
If the FAULT LED is lit or flashing, call Cisco TAC for assistance.

Connecting a 6-kW DC Power Supply to a DC Power Source

To connect a DC power supply directly to DC power sources, follow these steps:
Turn the power switch to standby (labelled as STBY).
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 and verify that all of the LEDs on the power supplies are off.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003
Size the power cables to the distance between the power supply and the DC power grid. If you need to
Step 3
cut a cable, cut it at the end that connects to the DC power grid, remove 0.75 inches (19 mm) of insulation
from the cut ends, and attach it to the DC power source. Be sure to connect the negative cables to negative
terminals and positive cables to positive terminals. To determine which color of cables is positive and
which color is negative, see the polarity marked on the plug at the other end of the cable.
Note
Hazardous voltage or energy may be present on DC power terminals. Always replace cover when
Warning
terminals are not in service. Be sure uninsulated conductors are not accessible when cover is in
place. Statement 1075
Connect one or two power cables (Cisco part number N7K-DC-CAB=) to the DC power supply and the
Step 4
DC power grid. Each cable has one plug that connects two fully isolated 1.5 kW input modules to a DC
power supply for 3 kW of power. Depending on your power requirements, connect the cables as follows:
OL-23069-07
If the supplied 15-foot (4.6-meter) power cables are too short to connect the 6-kW power supply
to the DC power source, you must install a PIU within reach of the power supply (see the
"Connecting a Power Supply to DC Power Sources through a Power Interface Unit" section on
page 6-18).
For 3 kW of output power (combined power mode), use one set of four cables and connect its
–
two fully isolated input modules to the DC power grid (see
For 6 kW of output power (combined power mode) or 3 kW of output power and 3 kW of
–
redundant power (power supply redundant mode), use two sets of four cables and connect their
fully isolated input modules to the same DC power grid (see
For 3 kW of output power and 3 kW of redundant power (input source redundant mode), use
–
two sets of four cables and connect each set of four cables to separate DC power grids (see
Figure 6-5 on page 6-13).
Connecting a DC Power Supply to DC Power Sources
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
Figure 6-3 on page 6-11).
Figure 6-4 on page 6-12).
6-17