Cisco CRS-16 DC Bedienungsanleitung

Installing and Removing Power Components

This chapter provides instructions on how to install and remove Cisco CRS Carrier Routing System 16-Slot

line card chassis power components.

This chapter presents the following topics:

•Power Component Information Common to the Two Types of Power Systems

•Installing and Remove Fixed Configuration Power Components

•Installing and Removing Modular Configuration Power Components

•Converting a Chassis from Fixed Configuration Power to Modular Configuration Power

•Power Systems Overview, on page 1

•Power Component Information Common to the Two Types of Power Systems, on page 2

•Installing and Remove Fixed Configuration Power Components , on page 15

•Installing and Removing Modular Configuration Power Components, on page 43

•Converting a Chassis from Fixed Configuration Power to Modular Configuration Power , on page 82

Power Systems Overview

There are two options for power systems: the fixed configuration power system and the modular configuration

power system. Power components are not interchangeable between the fixed and modular configuration power

system.

•Fixed configuration power system

Consists of two power shelves, DC power entry modules (PEMs) or AC rectifiers, and alarm modules. It is

available in versions for DC and AC power supplies. The AC version requires either 3-phase AC-Delta or

3-phase AC-Wye input power to the power shelves. It provides power sharing across power zones. The fixed

configuration power system includes SNMP MIBS and XML support.

•Modular configuration power system

Consists of two power shelves, AC or DC power modules (PMs), and alarm modules. It is available in versions

for DC and AC power supplies. However, unlike the fixed configuration power system, the AC version of

the modular configuration power system requires single-phase AC input power to the power shelves; there is

no 3-phase AC-Wye or AC-Delta. If you have 3-phase AC Delta or AC Wye at your equipment, a Cisco CRS

power distribution unit (PDU) will be required to convert 3-phase AC input power to single-phase AC input

power for the power shelf. At the shelf level, the power system provides 2N redundancy; the PMs themselves

Installing and Removing Power Components

provide load-share redundancy. The modular configuration power system also includes SNMP MIBS and

XML support.

In a modular configuration AC power system, PDU refers to the Cisco CRS PDU which is required to convert

3-phase AC-Wye or AC-Delta input power to single-phase AC input power for the modular configuration

AC power shelf. For further information, see the Cisco CRS 3-Phase AC Power Distribution Unit Installation

Guide .

Note

Power Component Information Common to the Two Types of

Power Systems

This section introduces information shared by the fixed configuration power components and the modular

configuration power components in the following topics:

• Basic Chassis Power Details

• Bonding and Grounding Guidelines

• DC Power Systems

• AC Power Systems

Basic Chassis Power Details

The LCC can be configured with either an AC-input power subsystem or a DC-input power subsystem. Site

power requirements differ, depending on the source voltage used. Follow these precautions and

recommendations when planning power connections to the router:

• Check the power at your site before installation and periodically after installation to ensure that you are

receiving clean power. Install a power conditioner, if necessary.

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

The LCC requires that at least one power shelf and its components be installed to operate properly; however,

if you install only one power shelf and its components, your system will not be 2N redundant.

Two types of power shelves exist: an AC shelf and a DC shelf. A fixed configuration AC power shelf houses

the AC rectifiers, while a fixed configuration DC power shelf houses the DC PEMs. A modular configuration

AC power shelf houses the AC PMs, while a modular configuration DC power shelf houses the DC PMs. It

is required that you use only one type of power shelf in a chassis at a time.

In a modular configuration power system, both AC and DC power supplies are referred to as power modules

(PMs).

Note

Installing and Removing Power Components

Power Component Information Common to the Two Types of Power Systems

The chassis might have more than one power connection. All connections must be removed to de-energize

the chassis. Statement 1028

Caution

Bonding and Grounding Guidelines

The router chassis has a safety earth ground connection in conjunction with power cabling to the fixed

configuration power shelves. The chassis allows you to connect the central office ground system or interior

equipment grounding system to the bonding and grounding receptacles on the router chassis, when either a

fixed or modular configuration power system is installed. Two threaded ground inserts are located on top of

the chassis rear (MSC) side panel to the left of the lower power shelf. The following figure shows the NEBS

and grounding points on the rear (MSC) side of the chassis with a modular configuration DC power shelf

installed. This grounding point is also referred to as the network equipment building system (NEBS) bonding

and grounding stud. The location of the grounding points on the LCC is the same for both fixed and modular

configuration power systems.

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

and grounding connections.

Note

Installing and Removing Power Components

Bonding and Grounding Guidelines

Figure 1: NEBS Bonding and Grounding Points—Modular Configuration DC Power Shown

NEBS bonding and grounding points2Chassis ground cable1

The previous figure shows a 45-degree grounding. A 180-degree (straight) grounding lug can also be used.

Note

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

Caution

The grounding points are hidden by a cover plate. When the cover plate is removed, you can easily see the

labels indicating the location of the grounding points. Two grounding points are provided; use the top grounding

point for NEBS grounding purposes.

Modular configuration power shelf grounding is accomplished by installing an external ground bracket between

the power shelves and attached to the chassis, as shown in the next figure. The bolts that connect the external

grounding brackets to the chassis and the power shelf have a torque value of 30 in.-lb (3.39 N-m). See Installing

Power Shelf Grounding Brackets for more information about installing power shelf grounding brackets.

Installing and Removing Power Components

Bonding and Grounding Guidelines

Figure 2: Power Shelf Grounding Brackets—Modular Configuration DC Power Shown

Two M6 hex nuts attaching grounding L-bracket to

shelf grounding bracket

5Chassis ground cable1

Grounding L-bracket6Two M6 hex bolts attaching ground lug to chassis2

Four M6 hex bolts attaching shelf grounding bracket

to power shelves

7Shelf grounding bracket3

Two M6 hex bolts attaching grounding L-bracket

to chassis

Installing the Chassis Ground Cable

This section describes how to install the ground cable on the LCC.

Installing and Removing Power Components

Installing the Chassis Ground Cable

Prerequisites

To ensure a satisfactory ground connection, you need the following parts:

• One grounding lug that has two M6 bolt holes with 0.63 inches (5/8 inch) (1.60 cm) of spacing center

to center between them and a 6 AWG or larger multi strand copper wire. The grounding lug used can be

either a 180 degree (straight) lug or a 45-degree lug.

Figure 3: 180-Degree (Straight) Chassis Ground Lug

Figure 4: 45-Degree Chassis Ground Lug

• Two M6 hex head bolts and integrated locking washers are pre-installed on the chassis.

Installing and Removing Power Components

Prerequisites

• Although we recommend at least 6 AWG multistrand copper ground cable, the actual cable diameter

and length depends on the router location and site environment. This cable is not available from Cisco

Systems; it is available from any commercial cable vendor. 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 chassis (DC-I: Isolated DC

Return).

Note

Required Tools and Equipment

• Ground lug

• Ground cable

• Crimping tool and lug specific die

• 10-mm 6 pt. combination wrench

• Torque wrench with 10-mm 6 pt. socket and rated accuracy at 30 in.-lb (3.39 N-m)

Steps

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

SUMMARY STEPS

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

2. Using the 10-mm wrench, attach the ground cable to the grounding point on top of the chassis rear (MSC)

side panel, as shown Figure 1: NEBS Bonding and Grounding Points—Modular Configuration DC Power

Shown. Then use the torque wrench to tighten to a torque of 30 in.-lb (3.39 N-m).

DETAILED STEPS

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

Step 2 Using the 10-mm wrench, attach the ground cable to the grounding point on top of the chassis rear (MSC) side panel, as

shown Figure 1: NEBS Bonding and Grounding Points—Modular Configuration DC Power Shown. Then use the torque

wrench to tighten to a torque of 30 in.-lb (3.39 N-m).

DC Power Systems

Each DC powered chassis contains two DC power shelves for 2N redundancy. The shelves contain the input

power connectors.

• In the fixed configuration power system, each power shelf contains three DC PEMs. The power shelves

and DC PEMs are field replaceable. Each DC PEM has its own circuit breaker.

•In the modular configuration power system, each shelf can accept up to eight DC PMs. The power shelves

and DC PMs are field replaceable.

Installing and Removing Power Components

Required Tools and Equipment

Depending on the hardware deployed at your site, your system may not consume the maximum power supplied

by the power system.

Note

Fixed Configuration DC Power

The LCC fixed configuration DC power system provides 13,200 watts to power the chassis.

Due to its power zones, the LCC using fixed configuration power requires a total of twelve dedicated 60 Amp

DC input power connections, two for each DC PEM, to provide redundant DC power to all six power zones.

We recommend that you have two separate, redundant –48 VDC power battery sources to provide power to

the LCC. Connect the six “A" 60 Amp DC inputs to the upper power shelf (PS0 in Figure 1-4) to one battery,

and the six “B” 60 Amp inputs to the lower power shelf (PS1 in Figure 1-4) to the other battery.

At sites where the LCC is equipped with a DC-input power supply shelf and DC PEMs, observe the following

guidelines:

• All power connection wiring should follow the rules and regulations in the National Electrical Code

(NEC) and any local codes.

• Each DC-input PEM connection is rated at 60 A maximum. A dedicated, commensurately rated DC

power source is required for each PEM connection.

• For DC power cables, we recommend that you use commensurately rated, high-strand-count copper

cable. Each DC PEM requires two DC inputs of nominal –48/–60 VDC, 60 A service. Each DC input

consists of one pair of cable leads, source DC (–) and source DC return (+). Each power shelf requires

one grounding cable. The length of the cables depends on the router location. These cables are not

available from Cisco Systems; they are available from any commercial vendor.

• DC power cables must be terminated by cable lugs at the power shelf end. The lugs should be dual hole

and able to fit over M6 terminal studs at 0.63 in. (5/8 in.) (1.60 cm) centers (for example, Panduit part

number LCD2-14A-Q), as shown in the next figure.

• Maximum wire size at the DC input terminal block is 2 AWG.

Figure 5: DC Power Cable Lug

The next figure shows a typical source DC power distribution scheme. The ground cable is to the far left on

the shelf. The DC terminal block cable connector screws have a 20 in.-lb (2.26 N-m) value; the power shelf

ground cable connector screws have a 30 in.-lb (3.39 N-m) torque value.

The color coding of the source DC power cable leads depends on the color coding of the site DC power source.

Typically, green or green and yellow indicates that the cable is a ground cable. Follow your local practices

for cable color code and markings. Ensure that the power cables are connected to the DC input power shelf

terminal studs in the proper positive (+) polarity and negative (–) polarity.

Installing and Removing Power Components

Fixed Configuration DC Power

Sometimes, the source DC cable leads might have a positive (+) or a negative (–) label, but 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 shelf.

The DC input PEM contains circuitry to trip the breaker on the PEM if it detects a reverse polarity condition.

When installing DC power cables, make sure that the polarity of the DC input wiring is correct.

Caution

This figure shows the cable wiring for the fixed configuration power shelf.

Figure 6: DC Power Shelf Cable Wiring for Fixed Configuration Power Shelf

The table lists the fixed configuration DC input current and voltage specifications.

Table 1: DC Input Current and Voltage Information

–48 VDC North America–60 VDC European Community(range: –42 VDC to –75

VDC)

Nominal input voltage

50 A maximum at –48 VDC40 A maximum at –60 VDCInput line current

168 A peak at –75 VDC(maximum for 1 ms)Inrush current

Each wiring block on the fixed configuration power shelf contains two sets of terminals, one positive and one

negative, and is covered by a plastic block cover that snaps onto the power shelf and is secured by a screw to

a torque value of 4 to 5 in.-lb (0.46 to 0.58 N-m). You must remove the block cover or rotate it out of the way

before you work with the cables. The block covers are slotted in such a way that the cables can exit only one

end. For the cables to point in a different direction, remove the block cover, rotate it, and snap it back on.

Modular Configuration DC Power

The LCC modular configuration DC power system can provide up to 16,800 watts to power the chassis.

However, by default, the power capability of a system when shipped, with six DC PMs per power shelf, is

12,600 watts.

Depending on the hardware deployed at your site, your system may not consume the maximum power supplied

by the power system.

Note

Installing and Removing Power Components

Modular Configuration DC Power

Each modular configuration DC power shelf supports up to eight DC PMs. The power shelves and DC PMs

are field replaceable.

Although each modular configuration DC power shelf can support up to eight DC PMs, the modular

configuration DC power shelf is shipped with six DC PMs per shelf.

Note

This figure shows the cable wiring for the modular configuration power shelf.

Figure 7: DC Power Shelf Cable Wiring for Modular Configuration Power Shelf

Each power shelf operates with up to eight DC inputs of –48/–60 VDC (nominal), 60A. The power shelf

accepts input DC power in the range –40 to –72 VDC.

This table lists the modular configuration DC input current and voltage specifications.

Table 2: DC Input Current and Voltage Information

–48 VDC North America–60 VDC European Community(range: –40 VDC to –72

VDC)

Nominal input voltage

50 A maximum at –48 VDC40 A maximum at –60 VDC60 A maximum at –40 VDCInput line current

Each wiring block on the modular configuration DC power shelf 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 the power shelf with a torque of 20 in.-lb

(2.26 N-m). Maximum wire size at the DC input terminal block is 2 AWG.

Installing and Removing Power Components

Modular Configuration DC Power

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