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Installing or Replacing Modules, Fan Trays, and Power Supplies
• Power cables are available to connect each DC power supply to the DC power source.
Step 1
Turn the power switch to standby (labeled 0 on the power switch).
Step 2
Turn off the power at the circuit breakers for the portions of the DC grid power that you are connecting 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
Warning
circuit.
Statement 1003
Step 3
Size the power cables to the distance between the power supply and the DC power grid. If you need to cut the cable, cut
it at the end that connects to the DC power grid, remove 0.75 inch (19 mm) of insulation from the cut ends, and attach
them to the DC power system. Be sure to connect the negative cables to negative lines and positive cables to positive
lines.
For all your power connections, if you are using cables with two different colors, use one color cable for all
Note
positive circuits and the other color for all negative circuits.
Hazardous voltage or energy may be present on DC power terminals. Always replace the cover when the terminals are
not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1075
Step 4
Remove the three screws that hold down the safety cover for the terminal box on the front of the DC power supply and
remove the cover (see the following figure).
The terminal box has four slots for four power terminals (ordered as negative [-], positive [+], positive [+], and
Note
negative [-]). Each terminal has two nuts that you use to fasten a power cable to the terminal.
Figure 32: Removing the Safety Cover for the Terminal Box on a 3-kW DC Power Supply
1
Remove three screws from the safety cover.
OL-31330-01
Connecting DC Power Supplies with Power Sources
2
Remove the cover.
Cisco Nexus 7706 Hardware Installation Guide
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