Cisco CRS Series Installation Manual

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Installing Power Components

This chapter provides instructions on how to install Cisco CRS Enhanced 16-Slot Line Card Chassis power components.

This chapter presents the following topics:

Power Systems Overview, page 1

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How to Install Power Components, page 9

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Power Up and Power Down a Chassis, page 50

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Power Systems Overview

The chassis power system provides power to chassis components and is made up of two AC or DC power shelves that contain AC or DC power modules (PMs) and alarm modules.

The AC power system requires single-phase AC input power to the power shelves. 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. The power system also includes SNMP MIBS and XML support.

Note

In the 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 AC power shelf. For further information and installation instructions, refer to the Cisco CRS 3-Phase AC Power Distribution Unit Installation

Guide .

This section contains the following topics:

Basic Chassis Power Details

The Cisco CRS Series Enhanced 16-slot Line Card Chassis 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. Follow these precautions and recommendations when planning power connections to the router:

Check the power at your site before installation to ensure that you are receiving clean power. Install a

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power conditioner, if necessary.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Bonding and Grounding Guidelines

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

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The Cisco CRS Series Enhanced 16-slot Line Card Chassis 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. An AC power shelf houses the AC PMs, while a DC power shelf houses the DC PMs. It is required that you use only one type of power shelf, either AC or DC, in a chassis at a time.

Installing Power Components

Danger

The chassis might have more than one power connection. All connections must be removed to de-energize the chassis. Statement 1028

Bonding and Grounding Guidelines

The router chassis has two safety earth ground connections. 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. Threaded ground inserts are located on top of the chassis rear (MSC) side panel to the right of the lower power shelf. There are also two sets of grounding studs located at the bottom of the rear (MSC) side of the chassis.

Figure 1: NEBS Bonding and Grounding Points—Top Rear (MSC) Side of Chassis, on page 3 shows the

grounding points at the top on the rear (MSC) side of the chassis. This grounding point is also referred to as the network equipment building system (NEBS) bonding and grounding point.

Note

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

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

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

Figure 1: NEBS Bonding and Grounding Points—Top Rear (MSC) Side of Chassis

Bonding and Grounding Guidelines

Note

Two Torx security screws1

The two bolts below the NEBS bonding and grounding points at the top of the chassis are required for proper bonding and grounding of the chassis and should not be removed.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Bonding and Grounding Guidelines

Figure 2: NEBS Bonding and Grounding Points—Bottom Rear (MSC) Side of Chassis, on page 4 shows

the NEBS and grounding points at the bottom on the rear (MSC) side of the chassis.

Figure 2: NEBS Bonding and Grounding Points—Bottom Rear (MSC) Side of Chassis

Installing Power Components

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Bonding and Grounding Guidelines

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

DC Power Systems

The Cisco CRS Series Enhanced 16-slot Line Card Chassis 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.

Installing Power Components

Note

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

Each DC powered chassis contains two DC power shelves for 2N redundancy. The shelves contain the input power connectors. Each shelf can accept up to eight DC PMs. The power shelves and DC PMs are field replaceable.

Figure 3: DC Power Shelf Cable Wiring for Power Shelf , on page 6 shows the cable wiring for the power

shelf.

Figure 3: DC Power Shelf Cable Wiring for 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.

Table 1: DC Input Current and Voltage Information, on page 7 lists the DC input current and voltage

specifications.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Table 1: DC Input Current and Voltage Information

DC Power Systems

Nominal input voltage

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

Input line current

50 A maximum at –48 VDC40 A maximum at –60 VDC60 A maximum at –40 VDC

Each wiring block on the 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.

The power supply terminal posts are centered 0.63 inches (5/8 inch) (1.60 cm) apart and are M6-threaded. We recommend that you use an appropriately sized 180-degree angle (straight) industry standard 2-hole, standard barrel compression lug, as shown in Figure 4: DC Power Cable Lug, on page 7.

Figure 4: DC Power Cable Lug

For additional power details, see Appendix A, “Cisco CRS Series Carrier Routing System 16-Slot EC Line

Card Chassis Specifications” or the Cisco CRS Series Carrier Routing System 16-Slot Line Card Chassis

System Description .

Input-Power-Present LEDs

The DC input-power-present LEDs provide a visual indication to service personnel that there is voltage present across the input terminal connection.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

AC Power Systems

Installing Power Components

Figure 5: Input-Power-Present LEDS, on page 8 shows the input-power-present LEDs on the rear of the

DC power shelf.

Figure 5: Input-Power-Present LEDS

Power should be disconnected before servicing the input power connection.Note

The input-power-present LED starts to light up when the input voltage reaches –20 VDC and the LED gets brighter as voltage increases; the input-power-present LED is fully lit when the input voltage reaches –38 VDC.

Caution

If the input voltage polarity is reversed, or if the LED circuit fails, the LED will not light. When this is the case, service personnel should check for hazardous voltages before working on the unit.

AC Power Systems

The Cisco CRS Series Enhanced 16-slot Line Card Chassis AC power system can provide up to 18,000 watts to power the chassis. However, by default, the power capability of a system when shipped, with five AC PMs per power shelf, is 15,000 watts.

Note

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

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Each AC powered chassis contains two AC power shelves for 2N redundancy. The shelves contain the input power connectors. Each shelf can contain up to six AC PMs. The power shelves and the AC PMs are field replaceable.

The AC power system requires single-phase AC input power. If you have 3-phase AC Delta or AC Wye at your equipment, a Cisco CRS PDU will be required to convert 3-phase AC input power to single-phase AC input power for the power shelf. For further information and installation instructions, refer to the Cisco CRS

3-Phase AC Power Distribution Unit Installation Guide .

The AC power shelf has the following input VAC power requirements:

How to Install Power Components

Single-phase, 200 to 240 VAC nominal, 50 to 60 Hz, 16 A.

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Each power shelf contains six IEC-320-C22 receptacles which can accept up to six IEC-320-C21

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connector plugs.

Note

If you have a Cisco CRS 3-Phase AC PDU installed, six AC PMs are required to be installed in each Cisco CRS Series Enhanced 16-slot Line Card Chassis AC power shelf to maintain a balanced 3-phase power load.

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

For additional power details, see Appendix A, “Cisco CRS Series Carrier Routing System 16-Slot EC Line

Card Chassis Specifications” or the Cisco CRS Series Carrier Routing System 16-Slot Line Card Chassis

System Description .

How to Install Power Components

This section describes how to install power components in the Cisco CRS Series Enhanced 16-slot Line Card Chassis.

Note

Although there are differences between the different types of power shelves and PMs (AC and DC), they are installed using the same procedures.

We recommend that you install the power components in the order outlined in this section. This section contains the following procedures:

Installing the Power A Bus Bar

This section describes how to install the Power A bus bar on the rear (MSC) side of the Cisco CRS Series Enhanced 16-slot Line Card Chassis. For complete information on regulatory compliance and safety, see Regulatory Compliance and Safety Information for the Cisco CRS Carrier Routing System .

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing the Power A Bus Bar

Prerequisites

There are no prerequisites for this task.

Required Tools and Equipment

You need the following tool to perform this task:

6-in. long number 1 Phillips screwdriver

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Steps

To install the Power A bus bar on the chassis, perform the following steps:

SUMMARY STEPS

To release the Power A bus bar from the shipping position, loosen the six captive screws that attach the

bus bar shipping bracket to the rear of the chassis. There are two screws on the right side, two screws on the front, and two screws on the left side of the Power A bus bar shipping bracket. See Figure 6: Removing

the Power A Bus Bar Shipping Bracket, on page 11.

Remove the Power A bus bar shipping bracket form the chassis and set it aside.

Remove the Power A bus bar from the rear of the chassis. See Figure 7: Removing the Cover From the

Power A Bus Bar, on page 12.

Remove the cover from the Power A bus bar by loosening the two captive screws that attach the cover to

the bus bar. See Figure 7: Removing the Cover From the Power A Bus Bar, on page 12.

Position the power block vertically. Mate the power block pivot and chassis pivot point together. See item

2 in Figure 8: Power A Bus Bar Installed in Chassis, on page 14.

Unscrew the two handle screws on the power bus bar and open the handle. See item 3 on Figure 8: Power

A Bus Bar Installed in Chassis, on page 14.

Hold the power block cable to the side to keep clear of the power block connectors while seating the power

block.

Seat the power block and tighten the two screws on the handle. See item 3 in Figure 8: Power A Bus Bar

Installed in Chassis, on page 14.

Tighten the Phillips captive screw that secures the tab on the left side of the power block to the chassis.

See item 1 in Figure 8: Power A Bus Bar Installed in Chassis, on page 14.

Installing Power Components

DETAILED STEPS

Step 1

To release the Power A bus bar from the shipping position, loosen the six captive screws that attach the bus bar shipping bracket to the rear of the chassis. There are two screws on the right side, two screws on the front, and two screws on the left side of the Power A bus bar shipping bracket. See Figure 6: Removing the Power A Bus Bar Shipping Bracket, on

page 11.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Installing the Power A Bus Bar

Note

The Power A bus bar is pre-attached to the top rear of the chassis in a horizontal position using a bus bar shipping bracket, due to shipping height restrictions.

Figure 6: Removing the Power A Bus Bar Shipping Bracket

Step 2 Step 3

Captive screws securing Power A bus bar bracket to rear of chassis

Remove the Power A bus bar shipping bracket form the chassis and set it aside.

Remove the Power A bus bar from the rear of the chassis. See Figure 7: Removing the Cover From the Power A Bus

Bar, on page 12.

Note

The Power A bus bar is connected to the chassis with an internal cable. Be careful not to drop the power bus bar.

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing the Power A Bus Bar

Installing Power Components

Step 4

Remove the cover from the Power A bus bar by loosening the two captive screws that attach the cover to the bus bar. See Figure 7: Removing the Cover From the Power A Bus Bar, on page 12.

Figure 7: Removing the Cover From the Power A Bus Bar

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Installing the Power A Bus Bar

Internal cable connection1

Screws attaching cover to Power A bus bar2

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing the Power A Bus Bar

Installing Power Components

Step 5

Step 6

Step 7 Step 8

Position the power block vertically. Mate the power block pivot and chassis pivot point together. See item 2 in Figure

8: Power A Bus Bar Installed in Chassis, on page 14.

Unscrew the two handle screws on the power bus bar and open the handle. See item 3 on Figure 8: Power A Bus Bar

Installed in Chassis, on page 14.

Hold the power block cable to the side to keep clear of the power block connectors while seating the power block.

Seat the power block and tighten the two screws on the handle. See item 3 in Figure 8: Power A Bus Bar Installed in

Chassis, on page 14.

Figure 8: Power A Bus Bar Installed in Chassis

Captive screw securing Power A bus bar to chassis1

Cisco CRS Routers 16-Slot Line Card Chassis Enhanced Router Installation Guide

Installing Power Components

Installing the Upper Grille Support

Chassis pivot point2

Two screws securing handle to Power A bus bar3

Step 9

Tighten the Phillips captive screw that secures the tab on the left side of the power block to the chassis. See item 1 in

Figure 8: Power A Bus Bar Installed in Chassis, on page 14.

What to Do Next

After the Power A bus bar has been installed, install the upper grille support. Continue to the Installing the

Upper Grille Support, on page 15 for more information.

Installing the Upper Grille Support

This section describes how to install the upper grille support on the Cisco CRS Series Enhanced 16-slot Line Card Chassis. For complete information on regulatory compliance and safety, see Regulatory Compliance and Safety Information for the Cisco CRS Carrier Routing System .

Although the upper grille support is an exterior cosmetic component, it must be installed prior to installing the upper chassis ground cable and the power shelves.