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
I
N
S
T
A
L
L
CISCO SYSTEMS, INC
1
2
3
4
I
N
P
U
T
O
K
F
A
N
O
K
O
U
T
P
U
T
F
A
IL
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