Adding, Removing, or Replacing a DC-Input Power Supply
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
7-32
Replacing a DC-Input Power Supply
In the following procedure, it is assumed that you will be replacing an existing power
supply in a router containing redundant DC-input power supplies. In this conf iguration, the
router’s online insertion and removal (OIR) capability enables you to replace a given power
supply without removing power from the router.
To replace a power supply in a redundant DC-input power supply configuration, perform
the following steps:
Step1 Set the rotary power switch on the faceplate of the power supply to be removed
to the OFF (O) position.
Note Turning the power supply switch to the OFF (O) position also releases the
mechanical interlock (latching mechanism) that secures the power supply in the
bay.
Step2 Locate and turn off the source DC circuit breaker that is currently servicing the
DC-input power supply.
Step3 Tape the circuit breaker handle in the OFF position as an additional safety
precaution.
Step4 Remove the plastic safety shield (see Figure 7-7) that covers the alarm terminal
block and the positive (+) and negative (–) terminals on the power supply
faceplate.
To remove the plastic safety shield, take the following actions:
(a) Loosen the knurled thumb wheel on the bottom left standoff that secures
the safety shield to the power supply faceplate.
(b) Grasp the safety shield and move it to the right and obliquely upward,
positioning the shield so that it can be freed from the three standoffs on the
power supply faceplate.
(c) Remove the shield from the standoffs and set it aside temporarily.