Cisco 3725 User Manual

Installing AC Power Supplies in Cisco 3725
Routers

Product Numbers: PWR-3725-AC=

This document describes how to replace the AC power supplies in a Cisco 3725 router.
This document is intended for the power supply installer, who should be familiar with electronic

circuitry and wiring practices and have experience as an electronic or electromechanical technician. Use
this document in conjunction with the Cisco 3700 Series Hardware Installation Guide and the
Regulatory Compliance and Safety Information document for your router.

If you have questions or need help, refer to the “Obtaining Technical Assistance” section on page 19.
This document contains the following sections:

• Safety Recommendations, page 2

• Overview of Cisco 3725 AC Power Supplies, page 6

• Required Tools and Equipment, page 6

• Accessing the Power Supply, page 7

• Replacing the Cisco 3725 Power Supply, page 8

• Electrical Connections for Cisco 3725 Routers, page 17

Warning

• Troubleshooting, page 18

• Obtaining Documentation, page 18

• Obtaining Technical Assistance, page 19

Only trained and qualified personnel should be allowed to install or replace this equipment. To see
translations of the warnings that appear in this publication, refer to the Regulatory Compliance
and Safety Information document that accompanied this device.

Corporate Headquarters:
Cisco Systems, Inc., 170 West Tasman Drive, San Jose, CA 95134-1706 USA

Copyright © 2002. Cisco Systems, Inc. All rights reserved.

Safety Recommendations

Warning

Warning

Warning

Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you have

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. To see translations of the warnings that
appear in this publication, refer to the Regulatory Compliance and Safety Information document
that accompanied this device.

Before working on a system that has an on/off switch, turn OFF the power and unplug the power
cord. To see translations of the warnings that appear in this publication, refer to the Regulatory
Compliance and Safety Information document that accompanied this device.

Ultimate disposal of this product should be handled according to all national laws and
regulations. To see translations of the warnings that appear in this publication, refer to the
Regulatory Compliance and Safety Information document that accompanied this device.

discharged all static electricity from your body before opening the chassis. Before performing
procedures described in this document, review the next section, “Safety Recommendations.”

Safety Recommendations

Warning

Warning

Follow these guidelines to ensure general safety:

• Keep the chassis area clear and dust-free during and after installation.

• Place the removed chassis cover in a safe place.

• Keep tools away from walk areas where you or others could fall over them.

• Do not wear loose clothing that may get caught in the chassis. Fasten your tie or scarf and roll up

your sleeves.

• Wear safety glasses when working under conditions that may be hazardous to your eyes.

• Do not perform any action that creates a potential ha zard t o pe op le o r m akes the e qu ipm ent unsa fe.

The ISDN connection is regarded as a source of voltage that should be inaccessible to user
contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided
equipment or connection hardware. Any hardwired connection (other than by a nonremovable,
connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. To see
translations of the warnings that appear in this publication, refer to the Regulatory Compliance
and Safety Information document that accompanied this device.

The Ethernet 10BaseT, Token Ring, serial, console, and auxiliary ports contain safety extra-low
voltage (SELV) circuits. BRI circuits are treated like telephone-network voltage (TNV) circuits.
Avoid connecting SELV circuits to TNV circuits. T o see translat ions of the wa rnings that appea r in
this publication, refer to the Regulatory Compliance and Safety Information document that
accompanied this device.

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Safety with Electricity

Safety Recommendations

Warning

Before working on equipment that is connected to power lines, remove jewelry (including rings,
necklaces, and watches). Metal objects will heat up when connected to power and ground and
can cause serious burns or weld the metal object to the terminals. To see translations of the
warnings that appear in this publication, refer to the Regulatory Compliance and Safety
Information document that accompanied this device.

Follow these guidelines when working on equipment powered by electricity:

• Locate the room’s emergency power-off switch. Then, if an electrical accident occurs, you can

quickly shut the power off.

• Before working on the system, turn off the power and unplug the power cord.

• Disconnect all power before doing the following:

–

Working on or near power supplies

–

Installing or removing a router chassis or network processor module

–

Performing most hardware upgrades

• Do not work alone if potentially hazardous conditions exist.

• Look carefully for possible hazards in your work area, such as moist floors, ungrounded power

extension cables, and missing safety grounds.

• Never assume that power is disconnected from a circuit. Always check.

• If an electrical accident occurs, proceed as follows:

–

Use caution, and do not become a victim yourself.

–

Turn off power to the system.

–

If possible, send another person to g et medical aid. Otherwise, determine the condition of the
victim and then call for help.

–

Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.

Preventing Electrostatic Discharge Damage

Electrostatic discharge (ESD) can damage equipme nt and impair electrical circuitry. It occurs when
electronic printed circuit cards are improperly handled and can result in complete or intermittent
failures. Always follo w ESD pr ev ention procedures wh en removing and replacing cards. Ensure that the
router chassis is electrically connected to earth ground. Wear an ESD-preventive wrist strap, ensuring
that it makes good skin contact. Connect the clip to an unpainted surface of the chassis frame to safely
channel unwanted ESD voltages to grou nd. To properly guard against ESD damage and shocks, the wrist
strap and cord must operate effectively. If no wrist strap is available, ground yourself by touching the
metal part of the chassis.

Caution For safety, periodically check the resistance value of the antistatic strap, which should be between 1

and 10 megohms (Mohms).

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Safety Recommendations

Safety Regulations

Warning

Waarschuwing

Varoitus

Attention

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. To see translations of the warnings that appear in
this publication, refer to the Regulatory Compliance and Safety Information document that
accompanied this device.

Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel
kan veroorzaken. Voordat u aan enige apparatuur g aat werken, di ent u zich bewust te zijn va n
de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van
standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de
waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory
Compliance and Safety Information (Informatie over naleving van veiligheids- en andere
voorschriften) raadplegen dat bij dit toestel is ingesloten.

Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan.
Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä
vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoi sta. Tässä julkaisussa esiintyvien
varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety
Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).

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. Pour prendre connaissance des
traductions d’avertissements figurant dans cette publication, consultez le document
Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de
sécurité) qui accompagne cet appareil.

Avvertenza

4

Warnung

Installing AC Power Supplies in Cisco 3725 Routers

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. Übersetzungen der in dieser
Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance
and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das
zusammen mit diesem Gerät geliefert wurde.

Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causa re infortuni alle
persone. Prima di lavorare su qualsiasi apparecchiatura, occorre cono scere i pericoli relativi
ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di
incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel
documento Regulatory Compliance and Safety Information (Conformità alle norme e
informazioni sulla sicurezza) che accompagna questo dispositivo.

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FCC Class A Compliance

Advarsel

Aviso

¡Advertencia!

Varning!

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 elektriske
kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker.
Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i
dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og
sikkerhetsinformasjon) som ble levert med denne enheten.

Este símbolo de aviso indica perigo. Encontra-se numa situação que lh e po derá causar da nos
físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os
perigos relacionados com circuitos eléctricos, e com quaisquer prá ticas comun s que po ssam
prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação,
consulte o documento Regulatory Compliance and Safety Information (Informação de
Segurança e Disposições Reguladoras) que acompanha este dispositivo.

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. Para ver una
traducción de las advertencias que aparecen en esta publicación, consultar el documento
titulado Regulatory Compliance and Safety Information (Información sobre seguridad y
conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.

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. Se förklaringar av de
varningar som förkommer i denna publikation i dokumentet Regulatory Comp liance and Safety
Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna
anordning.

FCC Class A Compliance

The equipment described in this document generates and may radiate r adio- frequenc y ener g y. If it is not
installed in accordance with Cisco installation instructions, it may cause interference with radio and
television reception. This equipment has been tested and found to comply with the limits for a
Class A digital device in accordance with the specifications in part 15 of the FCC rules. These
specifications are designed to provide reasonable protection against such interference in a residential
installation. However, there is no guarantee that interference will not occur in a particular installation.

You can determine whether your equipmen t is causi ng interference by turning it off. If the interference
stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment
causes interference to radio or television reception, try to correct the interference by using one or more
of the following measures:

• Turn the television or radio antenna until the interference stops.

• Move the equipment to one side or the other of the television or radio.

• Move the equipment farther away from the television or radio.

• Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is,

make certain that the equipment and the television or radio are on circuits controlled by different
circuit breakers or fuses.)

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Required Tools and Equipment

AC power supply

Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and
negate your authority to operate the product.

Required Tools and Equipment

Installation might require some tools and equipment that are not provided as standard equipment with
the router. Following are the tools and parts required for a typical router installation:

• Number 2 Phillips screwdriver

• ESD-preventive wrist strap

Overview of Cisco 3725 AC Power Supplies

Figure 1 shows an AC power supply for the Cisco 3725 router.

Note For clarity, the AC and On/Off switch box is not s hown.

Figure 2 shows the location of the power supply in the Cisco 3725 router.

Figure 1 Cisco 3725 AC Power Supply

62875

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Figure 2 Pow er Supply Location in the Cisco 3725 Router

On/Off

power supply

switch box

Overview of Cisco 3725 AC Power Supplies

AC power

supply

Accessing the Power Supply

To access power supplies on the Cisco 3725 router, remove the router cover as described in the “Removing

the Router Cover” section on page 8.

Warning

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. To see translations of the warnings that
appear in this publication, refer to the Regulatory Compliance and Safety Information document
that accompanied this device.

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 sy stems without a power switch, line voltages are present within
the power supply when the power cord is connected. To see translations of the warnings that
appear in this publication, refer to the Regulatory Compliance and Safety Information document
that accompanied this device.

62761

-48 VDC

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