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
1
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)
1
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
2
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
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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
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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
5
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
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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
7
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
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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
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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
10
Installing Power Components
Installing Power Components
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