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
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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
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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
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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.
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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
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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.
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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
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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.
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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.
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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
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Installing the Power Components
DC Power System
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