Cisco CISCO3725 Guía de instalación descargar pdf (Pagina 14)

Note For installations compliant with the National Electric Code, AWG 14 (2.0 mm

) wire is required for DC input and

safety ground wire.

Wiring Procedure for DC Input

To connect the router to a DC power source, perform the following 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.

Step 2 Strip the wires 3/16 inch to 1/4 inch (5 mm to 7 mm).

Step 3 Remove the plastic cover from the terminal block. Save it for reinstallation after you finish wiring.

Step 4 Connect the wires to the terminal block, starting with the safety ground wire. Insert each wire into the appropriate

terminal as shown in Figure 8. To avoid interference with the on/off switch, insert the wires from below. 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

Caution Do not overtorque the terminal block contact screws. Recommended torque is 8.0 ± 0.5 in-lb (0.90 ± 0.05 N-m).

Table 2 DC Wiring Requirements for Cisco 3725 Routers

DC Power Source DC Input

DC Input

Wire Size

1. See the note above this table for National Electric Code wire size requirements.

Safety Ground

Wire Size

Overcurrent

Protection

Nominal 24/48 VDC

2. The input voltage tolerance limits for DC power are 18 and 72 VDC.

24–36 VDC, 9 A, positive or negative,

single source or dual sources

AWG 18

(1.0 mm

)

AWG 14

(2.0 mm

)

15 A maximum

36–60 VDC, 4 A, positive or negative,

single source or dual sources

AWG 18

(1.0 mm

)

AWG 14

(2.0 mm

)

15 A maximum

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

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Cisco CISCO3725 Guía de instalación Pagina 14

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