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Removing and Replacing a DC-Input Power Supply
If you plan to return the old power supply to the factory, repackage it in the shipping container you
received with the replacement power supply.
Replacing a Power Supply
This procedure provides the steps necessary to replace a defective DC-input power supply or install
a second DC-input power supply. If you are upgrading your Cisco 12012 with a second DC-input
power supply for power supply redundancy, you must meet the following site power and source DC
power cable requirements prior to installing the second supply:
•
•
•
If you are upgrading your Cisco 12012 with a second DC-input power supply, you must remove the
two power supply blanks covering the empty power supply bays before installing the power supply.
Perform the following steps to install a new or replacement DC-input power supply:
Caution
power supply.
Step 1
Step 2
Step 3
Step 4
Step 5
Caution
DC power supply you are removing is in the OFF position. Also verify that the power switch on the
DC-input power supply is OFF (O). As an additional check, measure the voltages across the DC
power cable leads you intend to attach to the power supply. All readings should be zero volts.
Step 6
14 Cisco 12012 Gigabit Switch Router DC-Input Power Supply Replacement Instructions
A dedicated 60-amp service is available for the second power supply.
Three power cables—4 AWG, 0.204-inch (5.18-mm) diameter, high strand count. The cable
length is dependent on your router location. This cable is not available from Cisco Systems: it is
available from any commercial cable vendor.
Three power lugs—Must be dual-hole with .625-inch (15.86-mm) centers and able to fit over M6
threaded terminals. (Refer to Figure 3.) This type of lug is not available from Cisco Systems;
electrical-connector vendors, such as Panduit, provide this type of lug.
The DC-input power supply weighs 19 lb (8.3 kg). Use two hands when handling the
Attach an antistatic wrist strap to yourself and to one of the two ESD connection sockets
located on the front edges of the upper card cage or to bare metal on the frame.
Remove the replacement DC-input power supply from its shipping container.
Verify that the power switch on the replacement power supply is in the OFF (O) position.
Loosen the two screws that secure the DC-input power supply front cover in place. Lift
up slightly, then pull the front cover away from the power supply faceplate. Set the front
cover aside. (Refer to Figure 6.)
Remove the two screws that secure the source DC power cable bracket to the power
supply faceplate and remove the bracket.
Before proceeding to the next step, verify that the source DC circuit breaker servicing the
Thread the source DC power cable leads up underneath the power supply handle. Allow
sufficient slack in the power cable for strain relief.