Cisco CRS Series User manual

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
•How to Install Power Components, page 9
•Power Up and Power Down a Chassis, page 50
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.
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 .
Note
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
power conditioner, if necessary.
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•Install proper grounding to avoid damage from lightning and power surges.
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.
The chassis might have more than one power connection. All connections must be removed to de-energize
the chassis. Statement 1028
Danger
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.
These bonding and grounding receptacles are provided to satisfy the Telcordia NEBS requirements for
bonding and grounding connections.
Note
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Installing Power Components
Bonding and Grounding Guidelines

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
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.
Note
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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
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Installing Power Components
Bonding and Grounding Guidelines

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Installing Power Components
Bonding and Grounding Guidelines

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

Table 1: 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 VDC
Input line current
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.
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DC Power Systems

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.
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.
Caution
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.
Depending on the hardware deployed at your site, your system may not consume the maximum power
supplied by the power system.
Note
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AC Power Systems

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:
•Single-phase, 200 to 240 VAC nominal, 50 to 60 Hz, 16 A.
•Each power shelf contains six IEC-320-C22 receptacles which can accept up to six IEC-320-C21
connector plugs.
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.
Note
We recommend that you use appropriate short-circuit protection in compliance with national and local
electrical codes.
Note
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.
Although there are differences between the different types of power shelves and PMs (AC and DC), they
are installed using the same procedures.
Note
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 .
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How to Install Power Components

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
Steps
To install the Power A bus bar on the chassis, perform the following steps:
SUMMARY STEPS
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.
2. Remove the Power A bus bar shipping bracket form the chassis and set it aside.
3. 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.
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.
5. 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.
6. 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.
7. Hold the power block cable to the side to keep clear of the power block connectors while seating the power
block.
8. 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.
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.
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.
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Installing the Power A Bus Bar