5-110
Cisco 7600 Series Router Installation Guide
OL-4503-26
Chapter 5 Removal and Replacement Procedures
Removing and Replacing the Power Supply
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).
Note
For proper 6000W DC-input redundant power configuration, all four pairs of input wires for
one 6000W DC-input power supply must come from the same battery system (A feed); all
four pairs of input wires for the other 4000W DC-input power supply must come from
another battery system (B feed).
Note
For multiple DC input power supply, each DC input must be protected by dedicated circuit
breaker or fuse. The circuit breaker or fuse should be sized according to the power supply
input rating and local or national electrical code requirements.
Warning
When installing the unit, the ground connection must always be made first and disconnected last.
Caution
To prevent a short circuit or shock hazard after wiring the DC-input power supply, reinstall the terminal
block covers.
Step 12
If you are installing a previously-wired IPM, insert the IPM firmly into the power supply and tighten the
IPM captive screws. See
Figure 5-104
.
Figure 5-104
Inserting Previously-Wired IPM (2700W DC-input shown)
Step 13
After confirming all installation steps are correctly completed, safety flags and lockout devices can be
removed, and the input circuits to the supplies can be energized.
Step 14
Use the power switch to turn the power supply on.
Step 15
Verify power supply operation by checking that the power supply front panel LEDs are in the following
states:
191292
R
U
N
IN
S
TA
LL
CISCO SYSTEMS,
INC
1
2
3
4
INPUT OK
FAN
OK
OUTPUT
FAIL