Cisco PWR/7-DC Series Guide

1
Doc. No.
Copyright © 1995
Cisco Systems, Inc.
All rights reserved.
700-Watt DC-Input Power Supply
Installation and Replacement Instructions
78-1445-03
Product Number: PWR/7-DC and PWR/7-DC=
This document contains instructions for installing or replacing a direct current (DC)–input power
supply in the Cisco 7000 and Cisco 7507 chassis.
Note The DC–input power supply installation and functionality are identical for both chassis;
therefore, throughout this document, both chassis are referred to as the chassis, with differences
clearly noted.
The DC-input power supply is optional equipment for the chassis. A second, identical DC-input
power supply, when installed, provides redundant power. In systems with redundant power, the
power supplies are load-sharing and fully hot-swappable; you can remove and replace one supply,
while the remaining supply immediately ramps up to full power to maintain uninterrupted system
operation. Sections in this document include the following:
•Product Overview, page 2
•Installation Safety, ESD Precautions, and Tools Required, page 6
Note The following section, “Installation,” provides instructions for replacing a power supply in a
system that is already operating. If you are installing a new system, and you ordered a copy, refer to
the Cisco 7000 Hardware Installation and Maintenance or Cisco 7507 Hardware Installation and
Maintenance publications. Because the chassis are shipped without the power supplies installed,
refer to these publications for initial power supply installation and startup procedures. Both of these
publications are also available on UniverCD.
•Installation, page 10
•Checking the Installation, page 19
•Cisco Information Online, page 35

2700-Watt DC-Input Power Supply Installation and Replacement Instructions
Product Overview
Caution The following applies to Cisco 7000 chassis only: if you remove AC-input power supplies
from a Cisco 7000 and replace them with DC-input power supplies, you might need to replace the
LED board in the Cisco 7000 if the chassis was shipped before November 1, 1994. In this earlier
chassis, the LED circuitry will not recognize and indicate the presence of the new DC-input power
supplies.
If the chassis was shipped after November 1, 1994, no LED board replacement is required.
To replace the LED board (Product Number MAS-7000-LED=), refer to the configuration note
Cisco 7000 and Cisco 7507 LED Board Replacement (Document Number 78-1060-xx, where xx is
the latest version), which ships with the LED board spare part or is available on UniverCD.
Product Overview
The DC-input power supply is a modular power supply for the Cisco 7000 and Cisco 7507
multiprotocol, multimedia routers. The DC-input power supply is optional equipment in the chassis.
A second, identical power supply, if installed, provides redundant power. Power supplies reside in
power supply bays in the rear of the router chassis, as shown for the Cisco 7000 in Figure 1 and the
Cisco 7507 in Figure 2.
Figure 1 DC-Input Power Supplies in Cisco 7000
H2487
Slot 0 123 4 SP 
or
SSP
slot
RP
slot
Upper 
power supply
Lower
power supply
Captive
installation screw
Captive
installation screw
I
O
OUT FAIL
INPUT POWER
DO NOT SHIP WITH POWER SUPPLY
INSTALLED
FASTENER TO BE FULLY ENGAGED
BEFORE OPERATING POWER SUPPLY
INPUT VOLTAGE : 40-72 V=
INPUT CURRENT : 24-13A
NO SERVICEABLE COMPONENTS INSIDE
I
O
OUT FAIL
INPUT POWER
DO NOT SHIP WITH POWER SUPPLY
INSTALLED
FASTENER TO BE FULLY ENGAGED
BEFORE OPERATING POWER SUPPLY
INPUT VOLTAGE : 40-72 V=
INPUT CURRENT : 24-13A
NO SERVICEABLE COMPONENTS INSIDE

700-Watt DC-Input Power Supply Installation and Replacement Instructions 3
Product Overview
Figure 2 DC-Input Power Supplies in Cisco 7507
Thelowerpowersupplybaycontainsthefirst(orstandard)powersupply, and the upper bay contains
the second (optional) supply in systems with redundant power.
Caution To prevent tipping over the chassis when only one power supply is used, install it in the
lower power supply bay to maintain a low center of gravity in the chassis.
Dual power supplies are automatically load-sharing and redundant, which means that you can install
or replace a second power supply on line. During normal operation, dual supplies provide system
power simultaneously (load sharing). When you remove one supply, the remaining supply
immediately ramps up to provide full power and maintain uninterrupted power to the system.
Whenever possible, connect each power supply to a separate DC source.
H3890
Slot 0 123 4 5 6
Upper 
power supply
Lower
power supply
Captive
installation screw
Captive
installation screw
ENABLE
ENABLE
EJECT
SLOT 0
SLOT 1
NORMAL
CPU HALT
RESET
AUX.
CONSOLE
ROUTE SWITCH PROCESSOR
RSP slots
I
O
OUT FAIL
INPUT POWER
DO NOT SHIP WITH POWER SUPPLY
INSTALLED
FASTENER TO BE FULLY ENGAGED
BEFORE OPERATING POWER SUPPLY
INPUT VOLTAGE : 40-72 V=
INPUT CURRENT : 24-13A
NO SERVICEABLE COMPONENTS INSIDE
I
O
OUT FAIL
INPUT POWER
DO NOT SHIP WITH POWER SUPPLY
INSTALLED
FASTENER TO BE FULLY ENGAGED
BEFORE OPERATING POWER SUPPLY
INPUT VOLTAGE : 40-72 V=
INPUT CURRENT : 24-13A
NO SERVICEABLE COMPONENTS INSIDE

4700-Watt DC-Input Power Supply Installation and Replacement Instructions
Product Overview
Table 1 lists the DC-input power supply specifications.
Table 1 DC-Input Power Supply Specifications
Caution To prevent problems with the chassis, do not mix DC-input and AC-input power supplies
in the same chassis. Your chassis must have either DC-input or AC-input power supplies.
On the chassis front panel, the upper power and lower power LEDs go on when the power supply in
the corresponding bay is installed and supplying power to the system. Both the upper and lower
power LEDs should be on in systems with redundant power.
The power supply LEDs include the input power LED and the out fail LED. (See Figure 3.) The
green input power LED is on when the input power is applied. The yellow out fail LED is normally
off, but flashes at power on for a lamp test.
Figure 3 Power Supply LEDs—Upper Left Corner View
Specification Rating
DC-input voltage –40 volts (V) minimum
–48V nominal
–72V maximum
DC voltages supplied
and steady-state maximum
current ratings
+5.2V @ 100 amps (A)
+12V @ 15A
–12V @ 3A
+24V @ 5A
Input power requirement 1000 watts (W)
Power output 700W
Heat dissipation 1024 Btu/hr (300W)
Weight 14 pounds (6.35 kilograms)
Wire gauge for power cable 8 American Wire Gauge (AWG)
OUT FAIL
INPUT POWER
H2498

700-Watt DC-Input Power Supply Installation and Replacement Instructions 5
Product Overview
The out fail LED lights if the power supply shuts down for either of the following reasons:
•Power supply DC-output failure, which could be caused by loss of DC-input power (input line
failure or operator turned off system power) or an actual failure in the DC-input power supply
•Power supply shutdown, initiated by the power supply because it detected an out-of-tolerance
temperature or voltage condition in the power supply
In systems with a single power supply, and in systems with redundant power when both power
supplies are shutting down, the out fail LED lights momentarily as the system ramps down, but goes
out when the power supply has completely shut down. In systems with redundant power and one
power supply still active, the out fail LED on the failed power supply will remain on (powered by
the active supply).
The power supplies feature the following three safety interlock features:
•An on/off switch with a locking mechanism (see Figure 4) on each power supply prevents the
power supply from being removed from the chassis when the power supply switch is in the on (|)
position. When the switch is on, a metal tab extends into a slot in the chassis. When the switch
is off (O), the tab is raised and clears the slot.
Figure 4 On/Off Switch Locking Mechanism
•A captive installation screw at the top of the power supply front panel provides electrical
grounding and prevents the power supply from vibrating or sliding out of the bay and dislodging
from the power connectors in the backplane.
•Nylon ties on the DC input cable provide strain relief and prevent the power supply power cable
from accidentally being pulled out.
The power supplies are self-monitoring. Each supply monitors its own temperature and internal
voltages. An internal fan in each power supply draws cooling air from the front of the chassis
through the power supply and out the back of the chassis. An air dam keeps the power supply airflow
separate from that of the rest of the chassis (which is cooled by the system blower).
O
On/off switch Locking device
in ON and 
locked positions
I
H2495
INPUT VOLTAGE : 40-72 V=
INPUT CURRENT : 24-13A

6700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation Safety, ESD Precautions, and Tools Required
Installation Safety, ESD Precautions, and Tools Required
Before you begin this installation, review the safety guidelines in this section to avoid injuring
yourself or damaging the equipment. This section also provides power requirements to consider if
you are adding a second power supply to your system for redundant power, and lists of the tools and
parts you need to perform this installation.
Warning This warning symbol means danger. You are in a situation that could cause bodily injury.
Before you work on any equipment, be aware of the hazards involved with electrical circuitry and
be familiar with standard practices for preventing accidents.
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die
lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust
te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van
standaard maatregelen om ongelukken te voorkomen.
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa
ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää
sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista.
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation
pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement,
soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les
procédures couramment utilisées pour éviter les accidents.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer
Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie
sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur
Vermeidung von Unfällen bewußt.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare
infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli
relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di
incidenti.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til
personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som
elektriskekretserinnebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos
físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos
relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir
possíveis acidentes.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física.
Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y
familiarizarse con los procedimientos estándar de prevención de accidentes.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till
personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med
elkretsar och känna till vanligt förfarande för att förebygga skador.

700-Watt DC-Input Power Supply Installation and Replacement Instructions 7
Installation Safety, ESD Precautions, and Tools Required
Caution If you remove AC-input power supplies from a Cisco 7000 and replace them with
DC-input power supplies, you might need to replace the LED board in the Cisco 7000, if the chassis
was shipped before November 1, 1994. In this earlier chassis, the LED circuitry will not recognize
and indicate the presence of the new DC-input power supplies.
If the chassis was shipped after November 1, 1994, no LED board replacement is required.
To replace the LED board (Product Number MAS-7000-LED=), refer to the configuration note
Cisco 7000 Front Chassis Panel and LED Board Replacement (Document Number 78-1060-01),
which ships with the LED board spares or is available on UniverCD.
Safety Guidelines
The following guidelines will help to ensure your safety and protect the equipment. This list is not
inclusive of all potentially hazardous situations, so be alert.
•Never try to lift the chassis by yourself; two people are required to lift the chassis.
Warning Two people are required to lift the chassis. Grasp the chassis underneath the lower edge
and lift with both hands. To prevent injury, keep your back straight and lift with your legs, not your
back. To prevent damage to the chassis and components, never attempt to lift the chassis with the
handles on the power supplies or on the interface processors, or by the plastic panels on the front of
the chassis. These handles were not designed to support the weight of the chassis. (For translations
of this safety warning, refer to the section “Chassis Lifting Warning” on page page 23.)
Warning Do not use a ramp inclined at more than 10 degrees. (For translations of this safety
warning, refer to the section “Ramp Warning” on page page 24.)
•Always disconnect all power cords and interface cables before moving the chassis.
Warning Do not touch the power supply when the power cord is connected. For systems with a
power switch, line voltages are present within the power supply even when the power switch is off
and the power cord is connected. For systems without a power switch, line voltages are present
within the power supply when the power cord is connected. (For translations of this safety warning,
refer to the section “Power Supply Warning” on page page 24.)
Warning Before working on a chassis or working near power supplies, unplug the power cord on
AC units; disconnect the power at the circuit breaker on DC units. (For translations of this safety
warning, refer to the section “Power Supply Disconnection Warning” on page page 25.)
Warning This unit might have more than one power cord. To reduce the risk of electric shock,
disconnect the two power supply cords before servicing the unit. (For translations of this safety
warning, refer to the section “Electric Shock Warning” on page page 26.)
•Keep tools and chassis components away from walk areas.
•Do not work alone if potentially hazardous conditions exist.

8700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation Safety, ESD Precautions, and Tools Required
•Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
•Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
Warning This unit is intended for installation in restricted access areas. (For translations of this
safety warning, refer to the section “Restricted Area Warning” on page page 27.)
Warning Secure all power cabling when installing this unit to avoid disturbing field-wiring
connections. (For translations of this safety warning, refer to the section “Power Cabling Warning”
on page page 27.)
Lifting the Chassis Safely
This section is only applicable if you do not have clear access to the power supply bays and must
move a rack-mounted chassis. If you do have clear access to the power supply bays, proceed to the
next section, “Safety with Electricity.”
If space behind a rack-mounted chassis is limited, or if access to the power supply bays is partially
blocked by a power strip or other equipment, you may have to slide the chassis partially out of the
front of the rack before inserting the power supplies. The minimum requirement is for one person to
support the front of the chassis and another person to push it outward from the back and insert the
power supply. If you suspect that pushing the chassis out the front of the rack may topple the rack,
make sure enough people are available to support the rack while you perform this procedure.
The chassis weighs approximately 120 pounds with 1 power supply and 7 interface processors
installed.
Whenever you move or lift the chassis or any heavy object, observe the following guidelines:
•Never move suddenly or twist your body while supporting a heavy object.
Caution To prevent damage, never attempt to lift the chassis with the handles on the power
supplies or the interface processors. These handles are not designed to support the weight of the
chassis.
•Before sliding a chassis forward in a rack, ensure that doing so will not cause the rack to topple
forward. If you suspect it might, obtain additional assistance to help support the rack before
moving the chassis.

700-Watt DC-Input Power Supply Installation and Replacement Instructions 9
Installation Safety, ESD Precautions, and Tools Required
Safety with Electricity
You can remove or install a redundant (second) power supply without turning off the other supply.
Before removing a redundant power supply, ensure that the first supply is powered on to ensure
uninterrupted operation.
Follow these basic guidelines when working with any electrical equipment:
•Before beginning any procedures requiring access to the chassis interior, locate the emergency
power-off switch for the room in which you are working.
•Disconnect all power and external cables before moving a chassis.
•Do not work alone if potentially hazardous conditions exist.
•Never assume that power is disconnected from a circuit; always check.
•Do not perform any action that creates a potential hazard to people or makes the equipment
unsafe.
•Carefully examine your work area for possible hazards such as moist floors, ungrounded power
extension cables, and missing safety grounds.
In addition, use the guidelines that follow when working with any equipment that is connected to
telephone wiring or other network cabling.
Warning Do not work on the system or connect or disconnect cables during periods of lightning
activity. (For translations of this safety warning, refer to the section “Lightning Activity Warning”
on page page 28.)
•Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
•Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected
at the network interface.
•Use caution when installing or modifying telephone lines.
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which can occur when electronic boards or components are
handled improperly, can result in complete or intermittent failures. The processor modules each
comprise a printed circuit board that is fixed in a metal carrier. EMI shielding, connectors, and a
handle are integral components of the carrier. However, the fan control board is a printed circuit
board that is not intended for handling and has no frame or shielding. Handle a processor module or
fan tray by the metal frame or carrier only; avoid touching the board (particularly avoid touching
any components, traces, or the metal fingers on the edge connector).
Following are guidelines for preventing ESD damage:
•Always use an ESD-preventive wrist strap or ankle strap and ensure that it makes good skin
contact.
•When removing or installing a fan tray, connect the equipment end of a ground strap to an
unpainted surface of the chassis, such as a handle on the power supply.
•When removing or installing a power supply, connect the equipment end of a ground strap to the
chassis ground screw on the interface processor end of the chassis, or to an unpainted surface
inside the noninterface processor end of the chassis, such as the chassis frame.

10 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation
•Handle printed circuit boards, such as the arbiter, by the edges only; avoid touching the board
components, traces, or connector pins.
•Place removed printed circuit boards or components that contain boards on an antistatic surface
or in a static shielding bag. Place a removed board component-side-up; place a removed
processor module or fan tray board-side-up.
•If you are returning a replaced part to the factory, immediately place it in a static shielding bag
to avoid ESD damage to the board.
•Avoid contact between the board and clothing. The wrist strap only protects the board from ESD
voltages on the body; ESD voltages on clothing can still cause damage.
Caution Forsafety, periodically check the resistancevalueoftheantistaticstrap.Themeasurement
should be between 1 and 10 megohm.
Tools Required You need the following tools to install or replace a power supply:
•A 1/4-inch flat-blade and Number 2 Phillips screwdriver.
•Small, wire cutter.
•If the chassis is mounted in an equipment rack and cables from other equipment fall in front of
the power supply bays, you will need cable ties to temporarily anchor the cables out of the way.
•If access to the power supply bays is partially blocked by a power strip or other permanent rack
fixture, you will need a 1/4-inch flat-blade screwdriver to temporarily detach the ears from the
equipment rack mounting strips.
•ESD-preventive wrist strap.
Before beginning the power supply installation, check the installation screws on all power supplies
and check the area around the power supply bays to determine which tools you will need.
The new or replacement power supply and the power cable that you supply are the only parts you
need to complete this installation.
If you remove a power supply and leave the bay empty, install a cover plate over the empty bay. The
chassis is shipped with a cover plate installed over the upper bay. If the plate is not available, contact
a service representative to order a replacement (Product Number MAS-7KPSCOVER).
Circuit Breaker (30A) Warning
Warning This product relies onthebuilding’s installation for short-circuit (overcurrent) protection.
Ensure that a fuse or circuit breaker no larger than 120 VAC, 30A U.S. (240 VAC, 20A international)
is used on the phase conductors (all current-carrying conductors). (For translations of this safety
warning, refer to the section “Circuit Breaker (30A) Warning” on page page 28.)
Installation Thefollowingsectiondescribestheproceduresforremovinganexistingpowersupplyandinstalling
a new one. It also contains procedures for installing power supplies in a rack-mounted chassis when
the power supply bays are partially blocked.