Cisco Firepower 4150 Manuale - Pagina 13

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Installation, Maintenance, and Upgrade

Connect the DC Power Supply Module

This procedure describes how to install the DC power supply input power leads to the Firepower 4100 DC

input power supply on the rear PDU of the chassis.

Before You Begin

Note

• The color coding of the DC input power supply leads depends on the color coding of the DC power

source at your site. Make sure that the lead color coding you choose for the DC input power supply

matches the lead color coding used at the DC power source and verify that the power source is

connected to the negative (–) terminal and to the positive (+) terminal on the power supply.

• For DC input power cables, the wire gauge is based on the National Electrical Code (NEC) and

local codes for 26 amp service at nominal DC input voltage (–40/–72 VDC). One pair of cable leads,

source DC (–) and source DC return (+), are required for each power distribution unit (PDU). These

cables are available from any commercial cable vendor. All DC input power cables for the chassis

should be 10 gauge wire and cable lengths should match within 10 percent of deviation.

• Tools needed:

• Phillips head screwdriver

• 10-mm wrench or socket

• Connectors and wire for the DC circuit or circuits

Each DC input power cable is terminated at the PDU by a cable lug, as shown in the following figure.

DC input power cables must be connected to the PDU terminal studs in the proper positive (+) and

negative (–) polarity. In some cases, the DC cable leads are labeled, which is a relatively safe indication

of the polarity. However, you must verify the polarity by measuring the voltage between the DC cable

leads. When making the measurement, the positive (+) lead and the negative (–) lead must always match

the (+) and (–) labels on the power distribution unit.

Figure 5: DC Input Power Cable Lug

To avoid hazardous conditions, all components in the area where DC input power is accessible must be

properly insulated. Therefore, before installing the DC cable lugs, be sure to insulate the lugs according

to the manufacturer's instructions

Connect the DC Power Supply Module

Installation, Maintenance, and Upgrade