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Replacing a High Voltage (HVAC/HVDC) Power Supply
• Verify that you have an antistatic surface or antistatic bag for placing the power supply module that you
• Verify that the replacement power supply module has the same direction of airflow as the other modules
• Verify that the circuit breaker for the DC power source is turned off.
Step 1
Attach an ESD wrist strap or other ESD device to your body and an earth ground to prevent ESD damage.
You can attach the ESD device to any earth ground or grounded object, such as a grounded rack or ground connection
on a chassis.
Step 2
Verify that the DC power source is turned off at a circuit breaker.
Step 3
Remove the DC power supply that needs to be replaced as follows:
a) Turn off the circuit breaker for the power source to the power supply that you are replacing.
Verify that the OK LED turns off.
b) Unclip and remove the clear plastic cover that prevents access to the positive and negative terminals on the DC power
supply.
c) Unfasten the positive power cable from the right terminal.
d) Unfasten the negative power cable from the left terminal.
e) Replace the clear plastic cover that prevents access to the terminals.
f) Press the thumb latch to disengage the power supply from the chassis and use the handle to pull it part way out of
the chassis.
g) Place your other hand under the power supply to support it while you slide it out of the chassis. Place the power
supply on an antistatic surface.
h) If the power supply bay is to remain empty, install a blank power supply filler panel (N2200-P-BLNK).
Step 4
Install the replacement DC power supply as follows:
a) Hold the replacement power supply by the handle and position it so that the thumb latch is on the right, and then slide
it all the way into the power supply bay (the thumb latch will click), ensuring that the power supply is fully seated
in the bay.
b) If there is a clear plastic cover that prevents your access to the terminals, unclip it and remove it from the chassis.
c) Fasten the negative cable to the left terminal.
d) Fasten the positive cable to the right terminal.
e) Clip the clear plastic cover over the terminals to prevent accidental touching of the terminals.
f) Turn on the power at the circuit breaker.
g) Verify the power supply operation by checking that the OK LED is green.
Replacing a High Voltage (HVAC/HVDC) Power Supply
You can replace an HVACHVDC power supply during operations so long as the other power supply provides
power to the switch.
Cisco Nexus 3400-S Hardware Installation Guide
28
remove from the chassis.
in the same chassis. Otherwise the switch can overheat and shut down.
Replacing Modules
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