Cisco NCS 6000 Manuale utente

Installing the Power Components

This chapter provides an overview of the AC and DC power systems and how to install the power modules

and input power cables into the Cisco NCS 6000 Fabric Card Chassis (FCC). For information about removing

power components, see the Removing the Power Components section.

•Power System Overview, page 1

•Installing the Power Modules and Input Power Cables, page 11

•Powering On and Powering Off the Fabric Card Chassis, page 23

Power System Overview

The Cisco NCS 6000 FCC can be configured with either an AC input power system or a DC input power

system. Site power requirements differ, depending on the source voltage used.

For information about power safety requirements, see the Regulatory Compliance and Safety Information for

the Cisco Network Convergence System 6000 Series Routers.

Prerequisites

Follow these precautions and recommendations when planning power connections to the FCC:

•Check the power at your site before installation to ensure that you are receiving clean power (free of

spikes and noise). Install a power conditioner, if necessary.

•Install proper grounding to avoid damage from lightning and power surges.

Installing the Fabric Card Chassis Ground Cable

The FCC has two safety earth ground connections. You can connect the central office ground system or interior

equipment grounding system to either of these grounding points on the rear side of the FCC. One chassis

ground is located near the top of the FCC and one chassis ground is located at the bottom of the FCC. These

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

grounding points are also referred to as Network Equipment Building System (NEBS) bonding and grounding

point, and are provided to satisfy the Telcordia NEBS safety requirements.

Figure 1: NEBS Bonding and Grounding Points

—

Rear Side of the FCC

NEBS bonding and grounding point (lower)2NEBS bonding and grounding points (upper)1

Do not remove the FCC ground cable unless the FCC is being replaced.Caution

Required Tools and Equipment

You will need to provide the following tools and equipment:

•Number-2 Phillips screwdriver

•Ground lug

•Ground cable

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

Installing the Fabric Card Chassis Ground Cable

•Crimping tool and lug specific die

•3/8-inch drive torque wrench rated to include 30 in-lb (3.39 N-m)

To ensure a satisfactory ground connection:

•One 180-degree angle (straight) grounding lug that has two M6 bolt holes with 0.63 inch (16 mm)

spacing center to center between them, and a wire receptacle able to accept a 2-6-AWG multistrand

copper wire.

•Two M6 bolts with integrated square cone locking washers (shipped pre-installed on the FCC, two at

each grounding point).

•2-6-AWG multistrand copper ground cable. This cable is not available from Cisco; it is available from

any commercial cable vendor such as Panduit (see http://www.panduit.com). The cable should be sized

according to local and national installation requirements.

The DC return of this system should remain isolated from the system frame and FCC (DC-I: Isolated DC

Return).

Note

Figure 2: 180-Degree Angle Straight Barrel Grounding Lug

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

Installing the Fabric Card Chassis Ground Cable

Steps

To attach the ground cable to the FCC, follow these steps:

Step 1 Use the crimping tool mandated by the lug manufacturer to crimp the lug to the ground cable.

Step 2 Use the socket wrench to attach the lug and ground cable to one the NEBS grounding point (Figure 1: NEBS Bonding

and Grounding Points—Rear Side of the FCC ).

Figure 3: Attaching the Ground Cable to a NEBS Bonding and Grounding Point

Step 3 Use the torque wrench to tighten the bolts to a torque of 30 in-lb (3.39 N-m).

Step 4 Connect the other end of the ground cable to a grounding point at your site, according to site requirements.

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

Installing the Fabric Card Chassis Ground Cable

AC Power System

Overview of the AC Power System

An AC-powered Cisco NCS 6000 FCC contains four AC power trays that are part of the FCC power enclosure

(Figure 1). The upper two power trays (PT0 and PT1) are referred to as PS0, and the lower two power trays

(PT2 and PT3) are referred to as PS1. Figure 3. Each set of power trays has a power control module (PCM)

with its own I/O power switch.

Each AC power tray has three slots for PMs. The AC power trays are field-replaceable (after power down),

however the PMs are hot-swappable.

Each inserted AC PM requires a single-phase, 50 to 60 Hz, 200 to 240 VAC input. Input current is variable

and based on facility minimum voltage. For N+N redundancy, power feeds A must power the upper two AC

power trays and power feeds B must power the lower two AC power trays (not all of the power module bays

need to be filled). This allows the system to balance its load across each set of power trays and across the

power modules within each tray.

The AC power system requires single-phase AC input power to each inserted PM. If you have a 3-phase AC

Delta or AC Wye at your equipment, a Cisco NCS power distribution unit (PDU) is required to convert

3-phase AC input power to single-phase AC input power system.

If you plan to use a three-phase AC PDU we recommend that you install three AC PMs in each AC power

tray to maintain a balanced three-phase power load.

Note

We recommend that you use appropriate short-circuit protection in compliance with national and local

electrical codes.

Note

Installing an AC Power Distribution Unit

The AC PDU converts three-phase AC input power to single-phase AC input power that connects directly to

the rear of each PM. The AC PDU includes either an AC Delta (Cisco PID NCS-PDU-DELTA) or AC Wye

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

AC Power System

(Cisco PID NCS-PDU-WYE) power interface, and has power input and power output cords entering and

exiting the box.

Figure 4: Cisco NCS-PDU

Output cord4Rack mounting ears1

Two PDUs5Rack tray2

Input cord3

For detailed information on AC PDUs, see the Cisco CRS 3-Phase AC Power Distribution Unit Installation

Guide.

Mounting the PDU

The AC PDU mounting bracket holds two AC PDUs. The mounting bracket can be attached to both sides of

the FCC by using the existing screws that hold the side panels on (Figure 5: AC PDU Bracket Attached to

the Side of the FCC). The PDUs are attached to the mounting brackets with four M5 screws per AC PDU.

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

AC Power System

Optionally, you can mount the AC PDU in an external 19-inch rack by using six pan-head screws (Figure 6:

Rack Mounting the AC PDU in a 19-Inch Rack).

Figure 5: AC PDU Bracket Attached to the Side of the FCC

PDU bracket (chassis mount)2AC PDUs (one each side)1

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

AC Power System

Figure 6: Rack Mounting the AC PDU in a 19-Inch Rack

Installing the Tie-Down Bar

A 19-inch tie-down bar can be used to add strain relief for input power cables from the AC PDUs or cables

routed from a raised floor. The following figure shows holes for two 10-32 x 0.50 inch screws that are

pre-drilled on the FCC for attaching a tie-down bar.

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

AC Power System

The 19-inch tie-down bar and screws are not supplied by Cisco. You can order these parts from a

commercial vendor such as Panduit.

Note

Figure 7: 19-Inch Tie-Down Bar

Tie-down bar1

DC Power System

A DC-powered Cisco NCS 6000 FCC contains four DC power trays that are part of the FCC power enclosure

(Figure 1). The upper two power trays (PT0 and PT1) are referred to as power shelf 0 (PS0), and the lower

two power trays (PT2 and PT3) are referred to as power shelf 1 (PS1). Figure 3. Each set of power trays has

a power control module (PCM) with its own I/O power switch.

The DC power tray has four slots for PMs. The DC power trays are field-replaceable (after power down),

however the PMs are hot-swappable.

For N+N redundancy, “A”power feeds must power the upper two DC power trays and “B”power feeds must

power the lower two DC power trays (not all of the PM bays need to be filled). This allows the system to

balance its load across the two set of power trays and across the power modules within each tray.

The following table lists the DC input current and voltage specifications.

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

DC Power System

Table 1: DC Input Current and Voltage Information

–48 VDC or –60 VDC (tolerance range: –40 to –72 VDC)

Nominal input voltage

50 A maximum at –48 VDC

40 A maximum at –60 VDC

60 A maximum at –40 VDC

Input line current

Each wiring block on the DC power tray contains two sets of terminals, one positive and one negative, and

is covered by a plastic terminal block cover that is secured by a screw to a torque of 5 to 7 in-lb (0.56 to 0.79

N-m). Each DC power cable is connected to a power tray with a torque of 45 to 55 in-lb (5.1 to 6.2 N-m).

The terminal block supports 4-6-AWG input wire.

The cable should be sized according to local and national installation requirements. Use only copper cable.

An “allpole”separation of the power source is not required. The DC PM is an isolated DC/DC converter

with no galvanic connection between “L+”and the FCC. In addition, the “L+”potentials of each PM are

isolated from each other.

Note

Cisco Network Convergence System 6000 Fabric Card Chassis Hardware Installation Guide

Installing the Power Components

DC Power System

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