Cisco 2821 - Integrated Services Router Unified Communications Bundle Посібник із швидкого старту - Сторінка 22
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Wiring Procedure for DC Input
To connect the router to a DC power source, perform the following steps:
Remove power from the DC circuit. To ensure that power is removed from the DC circuit, locate the circuit breaker for
Step 1
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
Secure all power cabling when installing this unit to avoid disturbing field-wiring connections.
Tip
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
Strip the wires to the appropriate length for the terminals. The strip length is 3/16 to 1/4 inch (5 to 6 mm) for Amp
Step 2
number 32957 terminals.
Step 3
Crimp the terminals onto the DC power input and safety ground wires.
Remove the plastic covers from the terminal block. Save the covers for reinstallation after you finish wiring.
Step 4
Connect the wires to the terminal block, starting with the safety ground wire. Connect each wire to the appropriate
Step 5
terminal as shown in Figure 18. Tighten the terminal screws to 8.0 ± 0.5 in-lb (0.9 ± 0.05 N-m).
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
Do not overtorque the terminal block screws. The recommended torque is 8.0 ± 0.5 in-lb (0.90 ± 0.05 N-m).
Caution
Figure 18
DC Power Connections for Cisco 2800 Series Routers (Typical)
+
+
A
B
Negative DC input
22
-DC, input A
Return, input A
Safety ground
Return, input B
-DC, input B
A
Terminal
block
Positive DC input
Return, input A
+DC, input A
Safety ground
+DC, input B
Return, input B
+
+
B
Terminal
block