Cisco 7500 Series Configuration Manual page 129

Chapter 3 Installing a Cisco 7500 Series Router
R E V I E W D R A F T — C I S C O C O N F I D E N T I A L
The following procedure applies to AC-input and DC-input power supplies, with specific differences
Note
clearly noted. To prevent system problems, do not mix AC-input and DC-input power supplies in the
same chassis.
This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that
Warning
a fuse or circuit breaker no larger than 120 VAC, 15A United States (240 VAC, 10A international) is used
on the phase conductors (all current-carrying conductors).
Always install the first power supply in the lower power supply bay and the second, if any, in the upper
bay. In systems with dual power supplies and when separate power sources are available, connect each
power supply to separate input lines, so in case of an input line failure, the second source will most likely
still be available.
If you install a second power supply in the upper bay, use a screwdriver to loosen the captive screw and
remove the cover plate. Save the plate and replace it whenever the system is operating with one power
supply.
Before working on a chassis or working near power supplies, unplug the power cord on AC units or
Warning
disconnect the power at the circuit breaker on DC units.
Following is the procedure for installing power supplies in the Cisco 7507 or Cisco 7507-MX:
Step 1 If possible, turn off the circuit breaker to which you will connect power and tape the breaker switch in
the off position.
Step 2 Check the switch on the face of the power supply, and place it in the off (O) position. The interlock tab
should not extend out of the unit.
Step 3 Hold the power supply by the handle and place your other hand underneath to support the bottom.
Figure 3-9
Captive
installation
screw
OL-5008-03 B0
Handling a Power Supply (Cisco 7507 and Cisco 7507-MX AC-Input Power Supply
Shown)
Installing the Cisco 7507 and Cisco 7507-MX
Cisco 7500 Series Installation and Configuration Guide
3-15