Installing A 6-Kw Dc Power Supply Unit During Operations - Cisco Nexus 7000 Hardware Installation And Reference Manual

Replacing a DC Power Supply Unit During Operations
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Installing a 6-kW DC Power Supply Unit During Operations

After you remove a 6-kW DC power supply, you can replace it with another AC or DC power supply or
replace it with a blank plate until another power supply is available. To install an AC power supply unit,
see the
Warning Hazardous voltage or energy is present on the backplane when the system is operating. Use caution
when servicing. Statement 1034
To install a 6-kW DC power supply unit while a Cisco Nexus 7000 Series switch is operating, follow
these steps:
Unpack the replacement DC power supply unit and place it on an antistatic mat. Also, unpack the power
Step 1
cables.
Ensure that the power switch on the replacement DC power supply unit is in the standby (STBY)
Step 2
position.
Step 3 Ensure that the DC power source for the new power supply unit is turned off at the circuit breaker.
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
Statement 1003
Grasp the power supply unit handle with one hand, and place your other hand underneath the power
Step 4
supply unit to support its weight. Align the back of the power supply unit with the power supply bay and
slide the power supply into the power supply bay. Make sure the power supply unit is fully seated in the
power supply bay and that its four captive screws are aligned with their holes in the chassis.
Note The 6-kW power supply unit weighs 21 lb (9.5 kg). Use two hands to safely hold and move a power
supply unit.
Screw in each of the four captive screws and tighten to 8 in-lb (0.9 N·m).
Step 5
Attach the Earth ground to the power supply unit (see the
Step 6
on page
Warning When installing or replacing the unit, the ground connection must always be made first and
disconnected last. Statement 1046
If the power cables are not already connected to the DC power source, connect them as follows:
Step 7
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Cisco Nexus 7000 Series Hardware Installation and Reference Guide
10-14
If the power supply bay is to remain empty, install a blank power supply filler plate (Cisco part
number 800-28658-01) over the opening, and secure it with its captive screws.
"Installing a 6-kW or 7.5-kW AC Power Supply Unit During Operations" section on page
6-8).
For 3 kW of power, connect one set of power cables (two sets of positive and negative cables
attached to one plug) to the DC power circuit.
For 6 kW of power, connect two sets of power cables (four sets of positive and negative cables
attached to two plugs) to the DC power circuit.
Chapter 10 Installing or Replacing Components
"Grounding a 6-kW DC Power Supply" section
10-7.
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