Chapter 3 Installing and Removing AC and DC Input Power Supply and Fan Modules
Power Supply and Fan Module Installation
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity.
Statement 1001
Caution To prevent overheating and to maintain proper air flow, either a power supply module or a fan module must be installed in each power supply module slot at all times. Never operate the switch for extended periods of time without either a power supply module or a fan module installed in each power supply module slot.
Installing an AC Power Supply Module
This procedure is for installing an AC power supply module in the PSU 1 power supply module slot. Repeat these steps to install a power supply module in the PSU 2 power supply module slot.
Each AC power input is dedicated to one power supply module (PSU 1 or PSU 2). One AC power input does not power on both power supply modules at the same time (see Figure
Figure 3-5 AC Power Supply Diagram
AC-1 
PSU-1
AC-2 
PSU-2
2809 73
To install an AC input power supply module, follow these steps:
Step 1 Verify that the power from the power source is off.
Step 2 Insert the new power supply module in the power supply module slot, and gently push it into the slot (see Figure
Figure 3-6 Inserting an AC Power Supply Module in a Switch
PSU OK
AC
207478
Step 3 Align the two captive screws with the screw holes in the panel. Use a ratcheting torque screwdriver to torque each screw to 10
Step 4 Connect the AC power cord to the power supply module and to an AC power outlet.
Cisco ME 3800X and ME 3600X Switch Hardware Installation Guide
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