3-26
Cisco 2900 and 3900 Series Hardware Installation
OL-18712-01
Chapter 3 Installing and Connecting the Router
Connecting Power
Cisco 3900 Series Router Wiring Procedure for DC Input
To connect the router to a DC power source, follow these steps:
Step 1
Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the
circuit breaker for the DC circuit, switch the circuit breaker to the OFF position, and tape the
circuit-breaker switch in the OFF position.
Warning
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Statement 1003
Tip
Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
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.
Statement 1002
Step 2
Strip the wires to the appropriate length for the terminals. The length is 3/16 to 1/4 inch (5 to 6 mm) for
Panduit No. LCAS8-10F-L terminals.
Step 3
Crimp the terminals onto the DC power input and safety ground wires.
Step 4
Remove the plastic covers from the terminal block. Save the covers for reinstallation after you finish
wiring.
Step 5
Connect the wires to the terminal block, starting with the safety ground wire. Connect each wire to the
appropriate terminal as shown in
Figure 3-27.
Warning
The illustration shows the DC power supply terminal block. Wire the DC power supply as illustrated.
The proper wiring sequence is ground to ground, positive to positive, and negative to negative. The
ground wire should always be connected first and disconnected last.
Statement 239
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.
Statement 122
Caution
Do not overtorque the terminal block screws. The recommended torque is 18.0 – 20.0 in-lb (2.03 – 2.26
N-m).
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