|
|
Product Numbers: PWR-3725-DC-U=
This document describes how to replace the DC input 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.
This document contains the following sections:
 |
Warning 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. |
|
Warning 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. |
|
Warning 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. |
 |
Caution To avoid damaging electrostatic discharge (ESD)-sensitive components, ensure that you have discharged all static electricity from your body before opening the chassis. Before performing procedures described in this document, review the next section, "Safety Recommendations." |
Follow these guidelines to ensure general safety:
|
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:
Electrostatic discharge (ESD) can damage equipment and impair electrical circuitry. It occurs when electronic printed circuit cards are improperly handled and can result in complete or intermittent failures. Always follow ESD prevention procedures when 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 ground. 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). |
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:
Figure 1 shows a DC input power supply for the Cisco 3725 router. Figure 2 shows the location of the power supply in the Cisco 3725 router.
To access power supply on the Cisco 3725 router, remove the router cover as described in the "Removing the Router Cover" section.
|
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Network hazardous voltages are present in the BRI cable. If you detach the BRI cable, detach the end away from the router first to avoid possible electric shock. Network hazardous voltages also are present on the system card in the area of the BRI port (RJ-45 connector), regardless of when power is turned off. 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 power supply and cabling for the Cisco 3725 router is contained inside the chassis. To replace the power supply, complete these procedures:
To gain access to the Cisco 3725 DC input power supply, you must first remove the chassis cover:
|
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. |
Step 2 Remove all network interface cables from the rear panel.
Step 3 Remove the power cord.
|
Warning When installing the unit, always make the ground connection first and disconnect it last. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 4 Place the router so that the rear panel is closest to you. Remove the six screws located on top of the cover. Set the screws aside in a safe place.
Step 5 Lift the front edge of the cover. (See number 1 in Figure 3.)
Step 6 Slide the cover toward the right until the metal tabs on the rear edge separate from the chassis bottom. (See number 2 in Figure 3.)
Step 7 Lift the cover completely off and set it aside.
When you are ready to replace the cover, see the "Replacing the Router Cover" section.
After you remove the cover from the chassis, follow this procedure to remove the power supply:
 |
Note On a Cisco 3725 router, you can simply lift the connector away from the receptacle. (See Figure 4.) |
Step 2 The Cisco 3725 DC input power supply connector is held in the chassis by two external mounting screws at the rear of the router. (See Figure 5.) Remove the screws and set them aside.
Step 3 The Cisco 3725 DC input power supply is held in the chassis by one top-level screw towards the front and left side of the router. (See Figure 6.) Remove the screw and set it aside.
Step 4 Lift the power supply on/off switch box, at an angle, up and out of the chassis. (See Figure 7.)
Step 5 Slide the power supply back slightly in the chassis. This disengages the hooks built into the chassis that help secure the power supply. (See Figure 8.)
Step 6 Pull the power supply back and lift the power supply out of the chassis. (See Figure 9.)
To install a power supply in the chassis, follow these steps:
Step 2 Slide the power supply toward the side of the chassis, engaging the hook in the chassis. This enables the power supply to drop and engage the hinge, preventing further movement.
Step 3 Replace the top-level mounting screw that holds the power supply in place. (See Figure 6.)
Step 4 Replace the power supply connectors and the external connector mounting screws at the rear of the chassis. (See Figure 5.)
Step 5 Insert the large power connector into the receptacle on the motherboard. (See Figure 4.)
After you finish replacing the power supply, follow these steps to replace the cover:
Step 2 Hold the cover so that the tabs at the rear of the cover are aligned with the chassis bottom.
Step 3 Push the cover toward the rear, making sure that the cover tabs fit under the chassis back panel, and the back panel tabs fit under the cover.
Step 4 Slide the cover slightly to the left to lock the cover into position (number 1 in Figure 10).
Step 5 Lower the front of the cover onto the chassis (number 2 in Figure 10).
Step 6 Fasten the cover with the five screws you set aside earlier.
Step 7 Reinstall the chassis on a rack.
Step 8 Reinstall network interface cables.
Step 9 Proceed to the "Connecting Cisco 3725 Routers to DC Power" section.
This section explains how to connect DC power to Cisco 3725 routers.
|
Warning This unit is intended for installation in restricted access areas. A restricted access area is where access can only be gained by service personnel through the use of a special tool, lock and key, or other means of security, and is controlled by the authority responsible for the location. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Before performing any of the following procedures, ensure that power is OFF. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning This product relies on the building's installation or power supply for short circuit (overcurrent) protection. Ensure that a listed and certified fuse or circuit breaker no larger than 60 VDC, 15A U.S. is used on all current-carrying conductors. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Caution If you connect dual DC power sources, both sources must be the same polarity. Do not connect a -DC with a +DC source to a Cisco 3725. Opposite-polarity sources will damage the power supply. |
|
Note This product is intended for use with copper conductors only. |
|
Note The installation must comply with the 2002 National Electric Code (NEC) and other applicable codes. |
A Cisco 3725 router with a DC-input power supply requires copper wire, size AWG 14 (1.625 mm2), for the power connections.
You can connect a single DC power source to either the A input or the B input. If there are parallel dual power sources, connect one source to the A input and one source to the B input; both sources must be the same polarity. A NEBS-compliant chassis ground connection is required with both single source and parallel dual sources.
| DC Input | Wire Size | Ring Terminal (Lug) | Overcurrent Protection |
|---|---|---|---|
To connect the router to a DC power source, complete the following steps:
Step 2 Crimp the ring terminals to the DC power input wires.
|
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 3 Remove the plastic cover from the terminal block. Save it for reinstallation after you finish wiring.
|
Note Do not remove the colored screw at either end of the terminal block. Those are the terminal mounting screws. |
Step 4 Connect the DC power input wires to the terminal block as shown in Figure 11 or Figure 12. To avoid interference with the on/off switch, organize the wires downward from the terminal block.
|
Warning This warning applies only to units equipped with DC input power supplies. Wire the DC power supply using the appropriate lugs at the wiring end. The proper wiring sequence is ground to ground, positive to positive, and negative to negative. Note that the ground wire should always be connected first and disconnected last. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Caution Do not overtorque the terminal block contact screws. Recommended torque is 8.0 ± 0.5 in-lb (0.93 ± 0.05 N-m). |
|
Warning An exposed wire lead from a DC-input power source can conduct harmful levels of electricity. Be sure that no exposed portion of the DC-input power source wire extends from the terminal block plug. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Step 5 Install the plastic covers over the terminals. (See Figure 13.)
|
Warning The safety cover is an integral part of the product. Do not operate the unit without the safety cover installed. Operating the unit without the cover in place will invalidate the safety approvals and pose a risk of fire and electrical hazards. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Voltages might be present on the DC-input power supply terminals. Turn off the power source circuit breaker and remove the power supply before accessing 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. |
|
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. |
|
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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning Voltages might be present on the DC-input power supply terminals. Turn off the power source circuit breaker and remove the power supply before accessing 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. |
Step 6 Organize and secure the wires using cable ties as shown in Figure 13.
|
Warning Secure all power cabling when installing this unit to avoid disturbing field-wiring connections. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Warning The plug-socket combination must be accessible at all times because it serves as the main disconnecting device. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
|
Caution Never operate the router unless the unit is completely closed, to ensure adequate cooling. |
To power on the router, follow these steps:
Step 2 Power on the router. The LED labeled SYSTEM on the front panel should come on.
The following sections explain how to obtain documentation from Cisco Systems.
You can access the most current Cisco documentation on the World Wide Web at the following URL:
Translated documentation is available at the following URL:
http://www.cisco.com/public/countries_languages.shtml
Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.
Cisco documentation is available in the following ways:
http://www.cisco.com/cgi-bin/order/order_root.pl
http://www.cisco.com/go/subscription
If you are reading Cisco product documentation on Cisco.com, you can submit technical comments electronically. Click Leave Feedback at the bottom of the Cisco Documentation home page. After you complete the form, print it out and fax it to Cisco at 408 527-0730.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:
Cisco Systems
Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.
Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to
You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com, go to the following URL:
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.
Inquiries to Cisco TAC are categorized according to the urgency of the issue:
Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.
The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to the following URL:
All customers, partners, and resellers who have a valid Cisco services contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to the following URL to register:
http://www.cisco.com/register/
If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com registered user, you can open a case online by using the TAC Case Open tool at the following URL:
http://www.cisco.com/tac/caseopen
If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.
The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; these classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer will automatically open a case.
To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following URL:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled; for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). In addition, please have available your service agreement number and your product serial number.
This document is to be used in conjunction with Cisco 3700 Series Hardware Installation Guide and the Regulatory Compliance and Safety Information document for your router.
CCIP, the Cisco Arrow logo, the Cisco Powered Network mark, the Cisco Systems Verified logo, Cisco Unity, Follow Me Browsing, FormShare, iQ Breakthrough, iQ Expertise, iQ FastTrack, the iQ Logo, iQ Net Readiness Scorecard, Networking Academy, ScriptShare, SMARTnet, TransPath, and Voice LAN are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, Discover All That's Possible, The Fastest Way to Increase Your Internet Quotient, and iQuick Study are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherSwitch, Fast Step, GigaStack, Internet Quotient, IOS, IP/TV, LightStream, MGX, MICA, the Networkers logo, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, RateMUX, Registrar, SlideCast, StrataView Plus, Stratm, SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries.
All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0208R)
Copyright © 2002, Cisco Systems, Inc.
All rights reserved.
Posted: Wed Jan 22 11:00:23 PST 2003
All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.
