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Installing Power Supplies in Cisco 3631 Routers
78-13818-03
Electrical Connections for Cisco 3631 Routers
Wiring Procedure
To connect the router to a 48V DC power source, complete the following steps:
Step 1 Strip the wires to the appropriate length for the ring terminals. The strip length is 1/8 to 3/16 inch (3 to
5 mm) for Molex number 19073-0009 terminals.
Step 2 Crimp the ring terminals to the DC power input wires.
Warning
When stranded wiring is required, use approved wiring terminations, such as closed-loop or
spade-type with upturned lugs. These terminations should be the appropriate size for the wires
and should clamp both the insulation and conductor. To see translations of the warnings that
appear in this publication, refer to the Regulatory Compliance and Safety Information document
that accompanied this device.
Step 3 Remove the plastic covers from the terminal block. Save them for reinstallation after you finish wiring.
Note Do not remove the colored screw at either end of the terminal block. Those are the terminal mounting
screws.
Step 4 Connect the DC power input wires to the terminal block as shown in the applicable figure below. To
avoid interference with the on/off switches, and to bring the wires close to the cable-tie attachment
point, organize the wires downward from the terminal block.
Warning
This warning applies only to units equipped with DC input power supplies. Wire the DC power
supply using the appropriate lugs at the wiring end. The proper wiring sequence is ground to
ground, positive to positive (line to L), and negative to negative (neutral to N). Note that the ground
wire should always be connected first and disconnected last. To see translations of the warnings
that appear in this publication, refer to the Regulatory Compliance and Safety Information
document that accompanied this device.
Caution Do not overtorque the terminal block contact screws. The recommended torque is 8.2 ± 0.4 inch-lb.
Warning
An exposed wire lead from a DC-input power source can conduct harmful levels of electricity. Be
sure that no exposed portion of the DC-input power source wire extends from the terminal block
plug. To see translations of the warnings that appear in this publication, refer to the Regulatory
Compliance and Safety Information document that accompanied this device.
Wiring the DC-Input Power Supply for Cisco 3631 Routers
A Cisco 3631 router with a DC-input power supply requires copper wire and crimp-type ring terminals
for the power connections. Table 1 summarizes the wire size and ring terminal requirements.