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Connect HVAC/HVDC Power Supply to Power Source
Figure 29: DC Power Connection
Step 3
Connect the DC power cables in the following order.
a) Positive cables first.
b) Negative cables last.
Step 4
Repeat Step 3 for the other power modules installed in the tray.
Caution
Caution
Step 5
Replace the clear plastic safety covers over the connection terminal studs.
Step 6
Turn on the switch of the power shelf to turn on the system.
Connect HVAC/HVDC Power Supply to Power Source
The HVAC/HVDC power supply has 2 redundant input power lines. It can provide a power output of 6.3 kW
from each input power line with 2 inputs operating, or provide 4.8 kW (30A) or 3.15 kW (20A) output from
either input with one input operating. The HVAC/HVDC power supply provides n+n or n+x line redundancy
mode in a single power supply for the switch.
The HVAC/HVDC power supply accepts a maximum of 305VAC or 400VDC input power.
If you are not using power redundancy or are using n+1 power redundancy, you can connect all the power
supplies in the chassis to the same power grid on the rear end of each power tray. If you are using n+n power
redundancy, connect one redundant grid to one of the power supply inputs and the other redundant grid to the
other power supply input on the back of the power tray as shown for each power supply.
Before you begin
• Turn off the power source at its circuit breaker.
Cisco Nexus 9808 NX-OS Mode Switch Hardware Installation Guide
44
To prevent injury and damage to the equipment, always attach the ground and source DC power
cable lugs to power tray terminals in the following order: (1) positive (+) to positive (+), (2)
negative (–) to negative (–).
Do not overtighten the nuts that secure the DC power cables to the power tray terminals. Using
the 7/16 hex socket and torque wrench the nuts should be tightened to a torque of 45–50 in-lb.
Powering on the Switch
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