Cisco 3745 Installationsanleitung PDF herunterladen (Seite 19)

Installing Field-Replaceable Units in Cisco 3745 Routers

78-14308-02

Replacing Cisco 3745 Chassis Power Supplies

Wire and Terminal Requirements

Earlier model power supplies, PWR-3745-DC=, require copper wire, size AWG 14 to 16 (2.0 to

1.2 mm

), for the positive and negative connections and AWG 14 (2.0 mm

) minimum for the ground

connection. Use a spade lug, Molex part number 19099-0017 or equivalent, for these connections.

Later model power supplies, PWR-3745-DC-U=, require copper wire, size AWG 12 to 14 (3.0 to

2.0 mm

), for the positive and negative connections and AWG 12 (3.0 mm

) minimum for the ground

connection. For connecting AWG 12 wires, use a spade lug, Amp/Tyco part number 52961 or equivalent.

For connecting AWG 14 wires, use a spade lug, Molex part number 19099-0017 or equivalent.

Wiring Procedure

To connect the router to a DC power source, perform the following steps. If the DC input wires are

already prepared for termination, start with Step 3.

Step 1 Strip the wires to the appropriate length for the spade lugs. The strip length is 1/8 to 3/16 inch (3 to 5

mm) for Molex number 19073-0009 spade lugs.

Step 2 Crimp the spade lugs onto 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 cover from the terminal block. Save it for reinstallation after you finish wiring.

Step 4 Connect the DC power input wires to the terminal block as shown in Figure 13 on page 20.

Warning

This warning appliesonly tounits equippedwith DC input powersupplies. Wire theDC powersupply

usingthe appropriatelugs atthewiringend.The properwiring sequenceisground toground, positive

topositive (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 8.0 ± 0.5 in-lb

(0.93 ± 0.05 N-m).

Warning

Anexposed wirelead froma DC-inputpower sourcecan conductharmfullevelsofelectricity.Besure

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.

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