|
|
September 7, 1999
Read this document to learn how to install and remove the power entry modules (PEMs) and fan trays used in the Cisco 6260 digital subscriber line (DSL) access concentrator. Each Cisco 6260 chassis should contain two fan trays and at least one PEM.
This document contains the following sections:
This section tells you how to install and remove a Cisco 6260 fan tray.
The compartments for the two fan trays are located side by side near the bottom of the chassis, just above the PEMs. A narrow bezel fits across the chassis to hold the air filters and fan trays in place (see Figure 1).
You need a Number 2 Phillips screwdriver to remove and replace the bezel and to tighten the screws that secure the fan tray to the chassis.
It is not necessary to turn off power before installing a fan tray.
Follow these steps to install the fan trays:
Step 1 If the bezel is in place, use a Phillips screwdriver to remove it.
Step 2 Insert the fan tray into the chassis. Make sure that the pins in the lower lip of the fan tray's front panel engage with the holes in the PEM below.
Step 3 Press the fan tray firmly into its slot to ensure that the power connectors mate. If the power is on, you will hear the fans start to turn. The fault light for the fan tray you are installing will stay on until the fans reach full speed, which takes several seconds. (Fan fault LEDs are Fan 1 and Fan 2 on the NI-2 card, and Fan Tray 1 and Fan Tray 2 on the PEM.)
When you insert a fan tray, you might hear the fans in the other fan tray slow down; this is normal.
Step 4 Use the Phillips screwdriver to tighten the two fasteners on the fan tray.
Step 5 Use the Phillips screwdriver to replace the bezel.
You need not turn off the power before removing a fan tray. However, if you must remove a fan tray from an operating Cisco 6260, replace it within 5 minutes. If that is not possible, shut the system down and turn off the power to avoid thermal damage.
 | Caution The cooling fans in both fan trays must run while the system is powered up. The system could suffer thermal damage if the fans in either tray stop for more than 5 minutes. |
You need a Number 2 Phillips screwdriver to perform this procedure.
Follow these steps to remove a fan tray:
Step 1 Use a Phillips screwdriver to remove the bezel that partially covers the fan trays.
Step 2 Use a Phillips screwdriver to loosen the two captive screws on the fan tray.
Step 3 Grasp the fan tray by the handle and pull it from the chassis. If the fans are running, you will hear them slow down as the tray disengages from its power connector.
 | Warning The fans continue to turn at high speed for several seconds after the fan tray is removed from the chassis. To avoid injury to your hands, touch the fan tray only by its handle until the fans have stopped. |
If there is a second fan tray in the chassis, you will hear it speed up when you remove the first fan tray.
For instructions on installing a new fan tray, refer to the "Installing a Fan Tray in a Cisco 6260" section.
Cleaning and replacement of the air filter above the fan tray are described in the preventive maintenance chapter of the Cisco 6260 Hardware Installation and Troubleshooting Guide.
The section includes the following subsections:
The compartments for the two PEMs are located side by side at the bottom of the Cisco 6260 chassis. You need not disconnect power before inserting a PEM into the chassis. However, you must remove the fan tray from the compartment above the PEM, as described below. The fan tray overlaps the PEM and helps hold it in place.
Figure 2 shows the front of a PEM with its warning labels.
You will need both a Number 2 Phillips screwdriver and a flat-blade screwdriver to perform this procedure.
As you follow these steps, refer to Figure 3, which shows an exploded view of the chassis with fan trays, PEMs, and bezels removed.
Step 1 Ensure that the circuit breaker on the PEM you are installing is turned to OFF (0).
Step 2 If a fan tray is present above the compartment where you wish to install the PEM, you must remove the fan tray first. Do this:
(a) Use a Phillips screwdriver to remove the bezel that partially covers the fan trays.
(b) Use a Phillips screwdriver to loosen the captive screws that hold the fan tray in place.
(c) Grasp the fan tray by the handle and pull it from the chassis. If the fans are running, you will hear them slow down as the tray disengages from its power connector.
Step 3 Slide the PEM into its compartment in the chassis. Press the PEM firmly into place to ensure that the power connectors mate. If the chassis power is on, the green Input OK LED on the PEM turns on.
Step 4 Insert the fan tray into the compartment above the PEM. Make sure that the pins in the lower lip of the fan tray's front panel engage with the holes in the PEM below.
Step 5 Press the fan tray firmly into its slot to ensure that the power connectors mate. If the power is on, you will hear the fans start to turn. You might also hear the fans in the other tray slow down.
Step 6 Replace the bezel that covers the air filters.
Step 7 Use a Phillips screwdriver to tighten the captive screws on the bezel and on the fan tray.
Use the procedures in the section that follows, "Wiring a PEM," as you connect the newly installed PEM to DC power and ground.
This procedure tells you how to connect the Cisco 6260 system to a -48 VDC power source. Before you connect anything to the PEM, be sure that the chassis is connected to earth ground as described in the Cisco 6260 Hardware Installation and Troubleshooting Guide. The Cisco 6260 requires two or three ground connections: one to the side of the chassis and one to each power entry module (PEM). Only the PEM ground connections are described here.
The power connectors are receptacles in terminal blocks located on the power entry modules at the lower front of the chassis. A separate DC ground connects to the PEM as well. For full power redundancy, the power connectors on each PEM must be connected to separate power sources. If you do not require power redundancy, you can use the terminals on a single PEM, or connect both PEMs to a single power source.
 | Warning Only a DC power source that is isolated from AC mains with reinforced insulation, and that complies with the other safety extra-low voltage (SELV) requirements in UL1950, CSA 950 3rd Edition, EN 60950, and IEC950, can be connected to a Cisco 6260 system. This requirement ensures that in a catastrophic power source fault condition, hazardous voltages are not present on power terminals and connectors. |
| Warning If you use wiring terminations, use only the recommended ferrules. These terminations should be the appropriate size for the wires and should clamp the conductor firmly. |
| Warning
Use copper conductors only. |
| Warning Before connecting or disconnecting ground or power wires to the chassis, 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. Use a voltmeter to test for 0 (zero) voltage at the power terminals on the chassis. |
| 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 become welded to the terminals. |
Have the following items on hand before you begin connecting power:
| Conductor size | 6 AWG to 10 AWG (6 AWG preferred) |
| Construction | Multistranded copper |
| Diameter | Minimum: 2.989 mm or 117.7 mil |
| Conductor Size | Order Number | Ferrule Description | Recommended Crimping Tool | |
| 10 AWG | 3200548 | AL 6-12 YE (yellow) | Crimpfox UD 6 (Order no. 1204436) |
| 8 AWG | 3200551 | AL 10-12 RD (red) | Crimpfox 25 (Order no. 1203592) |
| 6 AWG | 3200564 | AL 16-12 BU (blue) | Crimpfox 25 (Order no. 1203592) |
To prepare the power leads for the Cisco 6260, you must strip a precise amount of insulation from the end of each lead and connect the leads to their power source.
Step 1 Cut the ends of the power and ground wires so that the ends are straight, not slanted.
Step 2 Measure 0.43 inch (11 mm) up from the end of each power and ground wire and place a mark at that point. These are the wire ends that will be connected to the Cisco 6260.
Step 3 Use the wire stripping tool to remove 0.43 inch (11 mm) of the covering from the end of each wire. Trim the end of the covering so that it is straight, as shown in Figure 4, not slanted.
| Warning Remove the covering from exactly the specified length of each power wire. If you strip too much of the covering, exposed wire protruding from the terminal block will create an electrical hazard. If you strip too little of the covering, the wire may not make a good contact with the terminal, or it may not be held securely in place in the terminal block. |
Step 4 If you are using the optional ferrules, use a crimping tool to attach them to the wires.
Step 5 Prepare the other end of each wire to be connected to a DC power source, according to the requirements of your site.
Step 6 Ensure that power in the DC circuit is off.
Step 7 Connect the power and ground wires to the DC power source or sources.
| Warning When you are installing the unit, the ground connection must always be made first and disconnected last. |
To attach the grounding wire to the grounding receptacle on the Cisco 6260, perform these steps:
Step 1 Ensure that power in the DC circuit is off.
Step 2 Turn all three screws on the terminal block counterclockwise to open the terminal connectors. This step ensures that the correct opening is presented for the wires. See Figure 5.
Step 3 Insert the end of the grounding wire into the grounding receptacle, which is the bottom receptacle in the terminal block on the power entry module (see Figure 6). If you are not using ferrules to terminate the wires, the stripped part of the wire must be fully inserted into the terminal block, so that no bare wire is exposed.
Step 4 Ensure that no wire strands are left outside the connector.
Step 5 Use the screwdriver to tighten the ground screw in the terminal block to a torque of 1.5 to 1.8 newton meters (13.28 to 15.93 inch-pounds). (Tighten in a clockwise direction.) Pull on the wire to ensure that it is held firmly in place.
Step 6 Make sure that the other end of the grounding wire is connected to ground at the DC power source.
Step 7 If you are connecting two power sources to the Cisco 6260 system, repeat this procedure for the second PEM.
| Warning Only a DC power source that is isolated from AC mains with reinforced insulation, and that complies with the other safety extra-low voltage (SELV) requirements in UL1950, CSA 950 3rd Edition, EN 60950, and IEC950, can be connected to a Cisco 6260 system. This requirement ensures that in a catastrophic power source fault condition, hazardous voltages are not present on power terminals and connectors. |
| Warning This unit has more than one power supply connection; all connections must be removed completely to completely remove power from the unit. |
Follow these steps to connect power to the system. Refer to Figure 7.
Step 1 Ensure that power in the DC circuit is off.
Step 2 Ensure that the PEMs are fully inserted into the Cisco 6260 chassis.
Step 3 Ensure that the circuit breakers on both PEMs are turned to OFF (0).
Step 4 Turn the + and - screws on the PEM terminal block counterclockwise to open the terminal connectors. This step ensures that the correct opening is presented for the wires. See Figure 5.
Step 5 Insert the battery return wire from the external power source into the receptacle labeled + (positive) on the first PEM. The stripped part of the wire must be fully inserted, so that no bare wire is exposed. Use the screwdriver to tighten the terminal screw to a torque of 1.5 to 1.8 newton meters (13.28 to 15.93 inch-pounds). (Tighten the screws clockwise.)
| Warning Wire the DC power supply as illustrated. The proper wiring sequence is ground to ground, positive to positive, and negative to negative. The ground wire must always be connected first and disconnected last. |
Step 6 Insert the power lead from the battery -48V power source into the receptacle labeled - (negative) on the first PEM. The stripped part of the wire must be fully inserted, so that no bare wire is exposed. Use the screwdriver to tighten the terminal screw to a torque of 1.5 to 1.8 newton meters (13.28 to 15.93 inch-pounds). (Tighten the screws clockwise.)
Step 7 If you are connecting a second power source, repeat Step 5 and Step 6 to wire it to the second PEM.
Step 8 Turn on power to the DC circuit.
Step 9 Use a voltmeter to check the voltage at the terminal block. Connect the voltmeter's positive contact to the positive (+) terminal on the Cisco 6260 terminal block. Connect the voltmeter's negative contact to the negative (-) terminal on the Cisco 6260's terminal block. If the power is wired correctly, you will see a reading of +48V on the voltmeter.
Step 10 Flip the circuit breakers on both PEMs to ON (1).
If the power is properly connected, a green LED on the front of each PEM lights up. The green LED indicates that the PEM is making power available to the chassis. You will also hear the fans start to turn. A slight delay in fan startup is normal.
If you remove a PEM from a Cisco 6260 chassis in which a second PEM is installed and providing power, the chassis continues to operate normally. If you plan to remove the only operating PEM from a chassis, you should shut the system down first.
Before you remove a PEM, you must remove the fan tray from the compartment above the PEM. The fan tray overlaps the PEM and helps to hold it in place.
Follow these steps to shut down the Cisco 6260:
Step 1 Before shutting down the Cisco 6260, use the Cisco IOS copy command to save any configuration changes to NVRAM:
c6260# copy running-config startup-config
Step 2 Turn the circuit breakers on both PEMs to OFF (0).
Follow these steps to remove a PEM from the Cisco 6260 chassis. If you are removing the only operating PEM from an active system, follow the previous procedure, "Shutting Down the Cisco 6260," before performing these steps.
You will need both a Number 2 Phillips screwdriver and a flat-blade screwdriver to perform this procedure.
| Warning Before connecting or disconnecting ground or power wires to the chassis, 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. Use a voltmeter to test for 0 (zero) voltage at the power terminals on the chassis. |
| 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 become welded to the terminals. |
Step 1 Ensure that power in the DC circuit is off.
Step 2 Ensure that the circuit breaker on the PEM you are about to remove is turned to OFF (0).
Step 3 If a fan tray is present above the compartment from which you wish to remove the PEM, you must remove the fan tray first. Do this:
(a) Use a Phillips screwdriver to remove the bezel that partially covers the fan trays.
(b) Use a Phillips screwdriver to loosen the captive screws that hold the fan tray in place.
(c) Grasp the fan tray by the handle and pull it from the chassis. If the fans are running, you will hear them slow down as the tray disengages from its power connector.
Step 4 Use the flat-blade screwdriver to loosen the screws in the terminal block on the PEM.
Step 5 Pull the power leads (+ and -) from the terminal block.
Step 6 Pull the ground wire from the terminal block.
Step 7 Grasp the PEM by the handle and pull it from the chassis.
Step 8 Reinsert the fan tray into its compartment. Press the fan tray firmly into the chassis to ensure that the power connectors mate. If the power is on, you will hear the fans start to turn. You might also hear the fans in the other fan tray slow down.
Step 9 Replace the bezel that covers the air filters.
Step 10 Use the Phillips screwdriver to tighten the captive screws on the bezel and the fan tray.
For more information on the Cisco 6260, refer to these publications:
In these ATM software manuals, look for information pertaining to the LightStream 1010, which uses the same software base as the Cisco 6260:
Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.
Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.
CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.
You can access CCO in the following ways:
For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM, a member of the Cisco Connection Family, is updated monthly. Therefore, it might be more current than printed documentation. To order additional copies of the Documentation CD-ROM, contact your local sales representative or call customer service. The CD-ROM package is available as a single package or through an annual subscription. You can also access Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
If you are reading Cisco product documentation on the World Wide Web, you can submit comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco. We appreciate your comments.
Posted: Mon Aug 7 18:55:09 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.