Cisco NCS 6008 LCC Manuale di istruzioni

Installing Power Components

This chapter describes how to install the Cisco NCS 6008 LCC power components.

For information about removing power components, see the "Removing the Power Components” section.

Note

•Power System Overview, on page 1

•Installing Power Components, on page 10

•Powering On and Powering Off the LCC, on page 27

Power System Overview

The LCC power system is made up of six AC or DC power trays that contain AC or DC PMs.

Basic Chassis Power Information

The Cisco NCS 6008 LCC 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 guide.

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

• 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.

There are two types of power trays: an AC tray and a DC tray. An AC power tray houses up to three AC PMs,

while a DC power tray houses up to four DC PMs. It is required that you use only one type of power tray,

either AC or DC, in a LCC at a time.

Bonding and Grounding Guidelines

The LCC has two safety earth ground connections. The LCC allows you to connect the central office ground

system or interior equipment grounding system to either of the two grounding points on the rear side of the

Installing Power Components

LCC. Threaded ground inserts are located on a rear panel near the top of the LCC (above the power trays)

and near the bottom of the LCC. The grounding points are also referred to as Network Equipment Building

System (NEBS) bonding and grounding points.

Figure 1: NEBS Bonding and Grounding Points—Rear Side of LCC

NEBS bonding and

grounding point (upper)

2NEBS bonding and

grounding point (upper)

These bonding and grounding receptacles are provided to satisfy the Telcordia NEBS requirements for bonding

and grounding connections.

Note

Do not remove the LCC ground cable unless the LCC is being replaced.

Caution

AC Power System

Each AC-powered LCC contains six AC power trays. The upper three AC power trays are contained within

power shelf 0 (PS0), and the lower three AC power trays are contained within power shelf 1(PS1). Each power

shelf has a Power bus Control Module (PCM) with its own 1/0 power switch. Each AC power tray can contain

up to three AC PMs. The AC power trays and PMs are field replaceable.

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 three AC

Installing Power Components

AC Power System

power trays and power feeds B must power the lower three AC power trays. Not all of the PM bays need to

be filled.

The AC power system requires single-phase AC input power to each inserted PM. If you have 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 have a 3-phase AC PDU installed, we recommend that you install three AC PMs in each AC power

tray to maintain a balanced 3-phase power load.

Note

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

codes.

Note

AC Power Distribution Unit

The AC PDU converts 3-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 (NCS-PDU-DELTA) or AC Wye (NCS-PDU-WYE)

power interface, and has power input and power output cords entering and exiting the box.

Figure 2: Cisco NCS-PDU

Output cord4Rack mounting ears1

Two PDUs5Rack tray2

Input cord3

Installing Power Components

AC Power Distribution Unit

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

Guide .

Mounting the AC PDU

The AC PDU mounting bracket holds three AC PDUs. An AC PDU mounting bracket can be attached to the

left and right sides of the LCC. The mounting brackets are attached to the chassis sides with the existing

screws that hold the side panels on. The PDUs are attached to the mounting brackets with four M5 screws

per AC PDU.

Figure 3: AC PDU Bracket Attached to the Side of the LCC

AC PDUs1

Bracket2

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

Installing Power Components

Mounting the AC PDU

Figure 4: Mounting the AC PDU in an External 19-Inch Rack

Tie-Down Bar and Cable Clamps

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 top cap for attaching a tie-down bar.

Figure 5: 19”Tie-Down Bar

Optionally, you can install cable clamps on the top of the LCC to secure multi-fiber cables to the LCC. We

recommend installing two cable clamp brackets with two stacked clamps on each bracket (four clamps for

each trough), however you can configure the number of clamps according to your configuration.

Installing Power Components

Tie-Down Bar and Cable Clamps

The tie-down bar and cable clamps are not supplied by Cisco. You can order these parts from a commercial

vendor such as Panduit (see http://www.panduit.com).

Note

Figure 6: Optional Cable Clamps for Multi-Fiber Cables

Cable clamps1

DC Power System

Each DC-powered LCC contains six DC power trays. The upper three DC power trays are contained within

power shelf 0, and the lower three DC power trays are contained within power shelf 1 (Each power shelf has

a PCM with its own 1/0 power switch) Each DC power tray can contain up to four DC PMs. The DC power

trays and PMs are field replaceable.

For N+N redundancy, power feeds A must power the upper three DC power trays and power feeds B must

power the lower three DC power trays. Not all of the PM bays need to be filled.

This table lists the DC input current and voltage specifications.

Installing 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 2-6-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 LCC. In addition, the “L+” potentials of each PM are isolated

from each other.

Note

The power supply terminal posts are centered 0.63 inches (16 mm) apart and are 1/4-20 thread. We recommend

that you use an appropriately sized 90-degree angle, industry-standard, dual-hole, standard barrel compression

lug.

Installing Power Components

DC Power System

Figure 7: 90-Degree Angle Standard Barrel Compression Lug

DC Input-Power-Present LEDs

The DC input-power-present LED provides a visual indication that there is voltage present across the input

terminal connection. The DC input-power-present LED starts to light up when the input voltage reaches –20

VDC, gets brighter as the voltage increases, and is fully lit when the input voltage reaches –48 VDC.

Power should be disconnected before servicing the input power connection.

Note

Installing Power Components

DC Input-Power-Present LEDs

If the input voltage polarity is reversed, or if the LED circuit fails, the LED will not light. In this case, service

personnel should check for hazardous voltages before working on the system.

Caution

Figure 8: DC Power Module Status Indicators

ON when input voltage is present

and within the correct range

Input OK LED1

ON when output voltage is presentOutput OK LED2

ON when an internal fault has

occurred on the PM

Fault LED3

AC Input-Power-Present LEDs

The AC input-power-present LED provides a visual indication that there is voltage present across the input

terminal connection. The AC input-power-present LED lights up when the input voltage reaches within the

acceptable range.

Installing Power Components

AC Input-Power-Present LEDs

Power should be disconnected before servicing the input power connection.

Note

Figure 9: AC Power Module Status Indicators

ON when input voltage is present

and within the correct range

Input OK LED1

ON when output voltage is presentOutput OK LED2

ON when an internal fault has

occurred on the PM

Fault LED3

Installing Power Components

This section describes how to install power components in the Cisco NCS 6008 LCC.

Installing Power Components

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