Cisco 4000 Series Hardware Installation Manual page 179

Chapter 5 Install and Upgrade Internal Modules and FRUs
•
Wire the DC Input Power Source on Cisco 4331 ISR
The Cisco 4331 ISR DC power supply supports 12V/21A output with the DC input range from 24 to 60
VDC.
The input current should be less than 6.3 A at 48 VDC. It is recommended to use slow blow fuse and
Note
have the input fuse value less than or equal to 25 A.
The Cisco 4331 ISR DC power supply has a terminal block that is installed into the power supply
terminal block header.
To wire the DC input power source:
Ensure that the power switch is in the standby position.
Step 1
Insert the power supply in the power-supply slot, and gently push it into the slot.
Step 2
Wire can be stripped and terminated directly to the power supply terminal block, or a crimp style spade
Step 3
terminal lug can be used. If you are using a terminal lug, follow the manufacturer's instructions for
terminating the lug to the wire. If terminating directly to the terminal block using bare wire, follow the
instructions in the
DC input power source and strip the wires to approximately 0.39 inch (10 mm) + 0.02 inch (0.5 mm). It
is recommended that 14 AWG insulated wire be used. Do not strip more than the recommended length
of wire because doing so could leave the wire exposed from the terminal block.
stripped DC input power source wire.
Figure 5-43
1
An exposed wire lead from a DC input power source can conduct harmful levels of electricity. Be sure
Warning
that no exposed portion of the DC input power source wire extends from the terminal block. Statement
122
Identify the positive and negative feed positions for the terminal block connection. The wiring sequence
Step 4
is:
1.
2.
OL-32185-02
Ensure that the chassis ground is connected on the chassis before you begin installing the DC power
supply. Follow the steps provided in the
Figure 5-37. Use a wire-stripping tool to strip each of the two wires coming from the
Stripped DC Input Power Source Wire
1
0.39 inch (10 mm) is the recommended wire-strip length for the terminal block.
Positive (+) lead wire (right)
Negative (–) lead wire (left)
Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
Remove and Replace Cisco 4000 Series ISRs Power Supplies
"Chassis Grounding" section on page 3-19.
Figure 5-38 shows a
5-55