Cisco 7600-SIP-400 - SPA Interface Processor 400 Installation Manual page 178

Removing and Replacing the Power Supply
The power supply terminal block lug opening width is 0.62 inch (15.8 mm). The terminal posts are
Note
centered 0.625 inches (15.88 mm) apart and are 1/4-20 threaded. We recommend that you use an
appropriately sized industry standard 2-hole, standard barrel compression lug. The power supply ground
studs, located below the terminal block, are also threaded 1/4-20 and require two 1/4-inch split-ring
washers and two 1/4-20 hex nuts.
Connect the DC-input wires to the 2700 W power supply terminal block
Step 7
Ground
•
Negative (-)
•
Positive (+)
•
Note When you tighten the terminal nuts, make sure they are snug. Do not over tighten them. Recommended
torque strength is 20 inch-pounds. Over tightening the terminal nuts can break the terminal block
(Maximum torque: 36 inch-pounds).
Depending on which side you are connecting the DC-input wires, be sure that the DC-input wires rest in
the appropriate cable holder.
Secure the ground cable to the cable holder with the two cable-ties.
Step 8
When installing the unit, the ground connection must always be made first and disconnected last.
Warning
Retrieve the cable holder covers from the plastic bag and attach to the front panel at the locations shown
Step 9
in Figure
Note
Secure the terminal block cover using four screws and the terminal block barriers with two screws each.
Step 10
Turn on the DC inputs and verify power supply operation by checking that the power supply front panel
Step 11
LEDs are in the following states:
INPUT OK LED is green
•
FAN OK LED is green
•
OUTPUT FAIL LED is not lit
•
If the LEDs indicate a power problem, see the
Cisco 7600 Series Router Installation Guide
5-50
Figure 5-55
5-54.
If the cable holder illustrated as number 5 and 8 in Fig 5-35 is loose on the DC input cables,
please use a long cable tie to secure the cable holders as shown in
Chapter 5
shows DC-input wires coming in from the left side.
"Identifying Startup Problems" section on page
Removal and Replacement Procedures
(Figure 5-54) in this order:
Figure 5-54.
4-2.
OL-4503-26