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.

700-Watt DC-Input Power Supply Installation and Replacement Instructions 11
Installation
If cables from other equipment are in front of the bay, move them aside and temporarily secure them
with cable ties. If you must remove a rack-mounted chassis from the rack, proceed to the following
section, “Removing a Rack-Mounted Chassis.” Otherwise, if you now have clear access to the
power supply bays, proceed to the section “Removing a Power Supply” on page 13 to replace an
existing supply, or to the section “Inserting a Power Supply” on page 16 to install a new power
supply for redundant power.
In systems with redundant power, you can install, remove, or replace one of the power supplies
without affecting system operation. When power is removed from one supply, the redundant power
feature causes the second supply to ramp up to full power and maintain uninterrupted system
operation.
Note This procedure is not for new system installation; perform this procedure only if you have
already connected the system to network interfaces and performed the first-time startup procedures
described in the Cisco 7000 Hardware Installation and Maintenance or Cisco 7507 Hardware
Installation and Maintenance publications, which are available on UniverCD or in print.
Removing a Rack-Mounted Chassis
This section describes how to proceed if your system is installed in an equipment rack and you do
not have clear access to the power supply bays. If the chassis is not in a rack, or if you already have
clearaccesstothepowersupplybays,youdonotneedtoperformthesesteps.Proceedtothesections
that follow.
Note The installation must comply with the 1993 National Electrical Code and other applicable
codes.
If you determine that moving the chassis is unavoidable, you will need to disconnect all power and
interface cables. Be sure to label the cables to avoid crossing them when you reconnect them to the
chassis. The configuration worksheet provided near the end of this document can help you reconnect
the cables to the correct ports if you complete it as you disconnect cables from the interface
processors. (For the Cisco 7000, refer to Figure 9, and for the Cisco 7507, refer to Figure 10.)
Caution This procedure might shift the chassis’ center of gravity toward the front of the rack and
may cause the rack or the chassis to tip. Before performing this procedure, ensure your safety by
verifying that you have sufficient assistance to support the rack and the chassis to prevent injury
from tipping or falling.
To slide the chassis out of the front of the rack to gain access to the power supply bays, do the
following:
Step 1 Check the power supply bays. If cables from other equipment fall in front of the power
supply bay, carefully gather the cables (using care not to strain them) and use cable ties to
anchor them away from the power supply bays. If no other equipment blocks access to the
bay, proceed to the sections that follow.

12 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation
Step 2 Before proceeding, ensure that at least one other person is available to support the front of
the chassis as you push it out the front of the rack and insert the power supplies.
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page page 29.)
Step 3 Turn all power supplies OFF and disconnect all power and interface cables from the rear of
the chassis. Use the configuration worksheet provided at the end of this document to record
interface port connections and avoid crossing cables when you reconnect them. (For the
Cisco 7000, refer to Figure 9, and for the Cisco 7507, refer to Figure 10.)
Step 4 Use a 1/4-inch flat-blade screwdriver to loosen the four binder-head screws that secure the
left and right ears to the front mounting strips on the equipment rack.
Caution To prevent damage, never attempt to lift or support the front of the chassis with the plastic
front panels. The panels can break away, which could cause the chassis to drop.
Step 5 Position at least one person in front of the rack to support the front undersides of the chassis
and prevent it from falling as you push it forward out of the rack. Grasp the chassis along
themetalundersidesbehindtheplasticfrontpanels.If possible, position two people infront
of the rack, one person to support each side of the chassis.
Warning The next step shifts the chassis’ center of gravity to the front of the rack and may cause
the rack or the chassis to tip or fall. Before proceeding, ensure your safety by verifying that you have
sufficient assistance to prevent injury due to the rack toppling and/or the chassis falling out of the
rack.
Step 6 From the rear of the equipment rack, slowly push the chassis forward out of the rack until
there is enough clearance for the power supplies to be inserted into the bay.
Step 7 Proceed to the section “Inserting a Power Supply” on page 16, and follow the steps
indicated as quickly and safely as possible.
Step 8 Push the chassis back into the rack until the ears meet the mounting strip on both sides of
the equipment rack.
Step 9 Secure each ear to the rack mounting strip with two binder-head screws.
Step 10 Reconnect all interface cables to the ports on the rear of the chassis. If you completed the
configuration worksheet before you disconnected the cables, use it as a guideline to
reconnect the cables. (For the Cisco 7000, refer to Figure 9, and for the Cisco 7507, refer
to Figure 10.)
Step 11 Proceed to the section “Checking the Installation” on page 19 to apply power and check the
installation.

700-Watt DC-Input Power Supply Installation and Replacement Instructions 13
Installation
Removing a Power Supply
If you are replacing the power supply in a single-supply system, remove the existing supply from
the lower bay first, if possible, and install the new power supply in the lower bay to maintain a low
center of gravity in the chassis. (You will have to interrupt system operation to do so.) Always install
a filler plate over an empty power supply bay to prevent electrical shock and to protect the backplane
connectors from contamination.
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page page 29.)
Following is the procedure for removing a power supply:
Step 1 On the DC-input power supply to be removed, turn the switch to OFF (O). (The interlock
tab will retract into the unit.)
Step 2 Use a screwdriver to loosen the captive installation screws on the terminal block cover.
(See Figure 5.)
Step 3 Lift and remove the terminal block cover. (See Figure 5.)
Figure 5 Removing the Terminal Block Cover
Step 4 Use the wire cutter to cut only the nylon ties that secure the cable to the metal bracket. (See
Figure 6.)
Warning When installing the unit, the ground connection must always be made first and
disconnected last. (For translations of this safety warning, refer to the section “Ground Connection
Warning” on page page 30.)
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
Captive installation screws 
on terminal block cover
H2531

14 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation
Step 5 Use a screwdriver to remove the three power leads from the terminal block. (See Figure 6.)
Step 6 Use a screwdriver to reinstall the terminal block cover. (The terminal block cover should
stay with the power supply.) Do not overtighten the captive installation screws on the
terminal block cover. The recommended torque is 8.2 0.4 inch-lb.
Step 7 Use a screwdriver to loosen the captive installation screw on the supply. (See Figure 6.)
Figure 6 Removing the Nylon Ties and Power Leads
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
Captive installation
screw
Power leads attached 
to terminal block
( ) negative
( ) positive
( ) ground
H2530
Nylon ties on cable
and metal bracket

700-Watt DC-Input Power Supply Installation and Replacement Instructions 15
Installation
Step 8 Grasp the power supply handle and pull the supply out of the bay. Place one hand
underneath to support the bottom of the supply as you pull it out of the bay. (See Figure 7.)
If the power supply resists when you attempt to pull it out of the bay, the switch is probably
not fully in the OFF (O) position, or the captive installation screw at the top of the supply
is not fully loosened. Turn the power switch fully counterclockwise to OFF (O), and check
the captive installation screw, then try removing the supply again.
Caution To prevent dropping the power supply, use both hands to handle it. The power supply
weighs approximately 14 pounds.
Figure 7 Handling a Power Supply
Step 9 If the power supply bay is to remain empty, install a cover plate (Product
Number MAS-7KBLANK)over the opening andsecurethe captive mounting screw. If you
are installing a replacement power supply, proceed to the section “Inserting a Power
Supply.” Otherwise, reconnect all power and interface cables on the rear of the chassis and
restart the system.
H2496
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

16 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation
Inserting a Power Supply
Always install the first power supply in the lower power supply bay and the second, if any, in the
upper bay. In systems with dual power supplies and when separate power sources are available,
connect each power supply to separate input lines so in case of an input line failure, the second
source will probably still be available.
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.
Following is the procedure for inserting a power supply:
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page page 32.)
Step 1 Always fill the lower power supply bay first. If you will install the new power supply in the
upperbayandacoverplateisinstalledoverit,useascrewdrivertoloosenthecaptivescrew
and remove the plate.
Note If you remove a cover plate from a power supply bay, save the plate and replace it whenever
the system is operating with one power supply.
Step 2 Check the switch on the face of the power supply, and place it in the OFF (O) position. The
interlock tab should not extend out of the unit.
Step 3 Hold the power supply by the handle and place your other hand underneath to support the
bottom. (See Figure 7.)
Caution To prevent dropping the power supply and injuring yourself, use both hands to handle it.
The power supply weighs approximately 14 pounds.
Step 4 Position the power supply so that it is aligned to go straight into the bay.

700-Watt DC-Input Power Supply Installation and Replacement Instructions 17
Installation
Step 5 Push the power supply all the way into the bay. Do not use unnecessary force; firmly push
the supply back into the bay until the power supply front panel is flush with the chassis rear
panel.
Caution When inserting a power supply into the bay, do not use unnecessary force; slamming the
power supply into the bay can damage the connectors on the rear of the supply and inside the chassis.
To prevent problems with the Cisco 7000, do not mix DC-input and AC-input power supplies in the
same chassis. Your Cisco 7000 must have either DC-input or AC-input power supplies.
Step 6 Using a screwdriver, tighten the captive installation screw on the top of each power supply.
(See Figure 8.)
Caution Always tighten the captive installation screw at the top of the power supply before turning
on the power switch. This screw prevents the power supply from shifting away from the internal
connectorand provides proper grounding for the supply. Do notovertighten the terminalblock cover
captive screws or the terminal block contact screws. The recommended torque is 8.2 0.4 inch-lb.
Step 7 Using a screwdriver, loosen the captive installation screws on the terminal block cover,
then lift and remove the cover. (See Figure 8.)
Warning When stranded wiring is required, use approved wiring terminations, such as closed-loop
or spade-type with upturned lugs. These terminations should be the appropriate size for the wires
and should clamp both the insulation and conductor. (For translations of this safety warning, refer to
the section “DC Power Supply Warning” on page page 31.)
Warning Before performing any of the following procedures, ensure that power is removed from
the DC circuit. To ensure that all power is OFF, locate the circuit breaker on the panel board that
services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of
the circuit breaker in the OFF position. (For translations of this safety warning, refer to the section
“DC Power Disconnection Warning” on page page 32.)

18 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Installation
Warning The illustration shows the DC power supply terminal block. Wire the DC power supply
using the appropriate lugs at the wiring end, as illustrated. The proper wiring sequence is ground to
ground, positive to positive (line to L), and negative to negative (neutral to N). Note that the ground
wire should always be connected first and disconnected last. (For translations of this safety warning,
refer to the section “DC Power Supply Wiring Warning” on page page 33.)
Figure 8 Installing the Power Cable Leads, Nylon Ties, and Cover
Warning Incorrectly wiring the terminal block could create a dangerous shock hazard and could
damage the power supply, power source, and the chassis components.
Step 8 To provide strain relief for the three DC-input cable, attach two nylon ties around the cable
and the metal bracket. (See Figure 8.)
Step 9 Install the terminal block cover over the terminal block, and tighten the captive installation
screws. (See Figure 8.) Do not overtighten the captive installation screws on the terminal
block cover. The recommended torque is 8.2 0.4 inch-lb.
Warning To prevent a short-circuit or shock hazard after wiring the DC-input power supply,
replace the terminal block cover.
Step 10 Connect the opposite end of the DC-input cable to the DC power source.
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
H2486
Power supply captive 
installation screw
Terminal block cover
(removable)
Power leads attached 
to terminal block
( ) negative
( ) positive
( ) ground
Nylon ties on the cable
and metal bracket
DC-input cable
Captive installation screws 
on terminal block cover

700-Watt DC-Input Power Supply Installation and Replacement Instructions 19
Checking the Installation
Note Do not turn on any power supplies until you are ready to power up the system. The interlock
switch that locks the power supply in the slot also turns on the system power.
Step 11 If you are installing or replacing a second power supply, repeat step 1 through step 11 for
the second power supply.
Step 12 Proceed to the following section “Checking the Installation” to apply power and check the
installation.
Checking the Installation
To complete the installation turn the power supply on and observe the LEDs on the power supply to
verify that the new supply is operating properly using the following steps:
Step 1 Review the descriptions of the power supply LEDs on page 4.
Step 2 Check the following components to make sure they are secure:
•Each power supply is inserted all the way into its bay, and the captive installation screw
is tightened.
•All power supply cables are attached to the terminal blocks and secured with nylon ties.
•At the DC power-source end of the power cable, make sure the leads are securely
attached to the DC power, and make certain the source power is within the range
indicated on the power supply.
•When two supplies are present, make sure the second cable is connected to a separate
DC power source if possible.
Warning After wiring the DC power supply, remove the tape from the circuit breaker switch handle
and reinstate power by moving the handle of the circuit breaker to the ON position. (For translations
of this safety warning, refer to the section “DC Power Connection Warning” on page page 34.)
Step 3 Turn the power supply ON (|) by turning the switch clockwise one-quarter turn.
If the power supply switch resists, the power supply is probably not fully inserted into the
bay. Turn the power switch fully counterclockwise to OFF (O), pull the power supply out
of the bay about 2 inches, then push the power supply firmly back into the slot. Do not slam
the supply into the slot; doing so can damage the connectors on the supply and the
backplane. Tighten the captive installation screw before proceeding.

20 700-Watt DC-Input Power Supply Installation and Replacement Instructions
Checking the Installation
Step 4 Verify that the out fail LED stays off.
•If the out fail LED goes on, move the power supply to the other bay if possible and turn
the power switch ON (|). If the LEDs go on properly when the supply is installed in the
other bay, suspect a faulty backplane power connector.
•If the out fail LED goes on when the power supply is installed in the other bay, suspect
a power supply failure or an adverse environmental condition (the power supply has
detected an overvoltage or overtemperature condition and has shut down).
•If two power supplies are installed, and the out fail LED goes on only on one power
supply, assume that the power supply or DC source (for that supply) is faulty.
•If the out fail LED lights on two supplies that are connected to the same DC source,
suspect that the DC source is faulty, or that an overvoltage or overtemperature condition
is causing the power supplies to shut down.
•If the out fail LED lights on two supplies that are connected to separate DC sources,
assume that an overvoltage or overtemperature condition is causing the power supplies
to shut down.
If the power supply fails (and you need to order a replacement) and you did not record the type of
power supply in your chassis, you will have to check the chassis in order to make this determination.
Timesaver Inthe Cisco 7000 chassis, with Maintenance Release 9.17(10) andlater, the systemcan
identify which type of power supplies are in your chassis: DC-input or AC-input. As a general
precaution, use the show environment all command and note the type of power supply indicated in
each of your chassis (indicated as either “700W DC” or “700W AC”). Record and save this
information in a secure place.
Note If you are currently using software other than Maintenance Release 9.17(10) or later in your
Cisco 7000, then the show environment all command will indicate the AC-input power supply as
“850W.” A DC-input power supply will still be indicated as “700W.”
This completes the power supply installation. Refer to the Cisco 7000 Hardware Installation and
Maintenance and Cisco 7507 Hardware Installation and Maintenance publications for installation
troubleshooting procedures, and to the Router Products Configuration Guide for descriptions and
examples of software features and commands. Both of these publications are available on UniverCD
or in print.
Note If the power supply fails to operate properly after several attempts to initialize it, refer to the
following section to contact a service representative for assistance.