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Product Numbers MAS-7513-FAN= (Cisco 7513), MAS-7576-FAN= (Cisco 7576)
Customer Order Number: DOC-781989=
The blower module assembly for the Cisco 7513 and Cisco 7576 chassis is a spare part that can be replaced in the field.
This document provides the procedures for replacing the blower module. It assumes that you have already performed all of the necessary troubleshooting steps outlined in the Cisco 7500 Series Installation and Configuration Guide, and that you have concluded that replacement is required.
This publication includes the following sections:
The Cisco 7513 and Cisco 7576 system blower is mounted in a module (drawer) located above the card cage on the interface processor end of the chassis. (See Figure 1.) The system blower draws cooling air through the chassis interior to maintain an acceptable operating temperature for the internal components.
The blower module assembly includes the blower, a printed circuit board (control board) mounted on a metal plate, three front panel LEDs, a power connector, and a metal case with a handle. A view of the end of the blower module (opposite the end with the handle) is shown in Figure 3.
The entire blower module assembly is available as a spare part. If any one of the internal parts fails (blower, control board, or LEDs), the entire assembly must be removed and replaced.
The blower module slides into the top of the Cisco 7513 and Cisco 7576 chassis from the interface processor end of the router. (See Figure 1 and Figure 4.) The blower draws air in through the inlet vents below the chassis card cage, up through the card cage, processor modules, and other internal components, through the blower module, and out through the exhaust vents on the front of the chassis. Figure 4 shows the airflow path.
The front and back of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating inside the chassis. (See the "Site Environment" section.)
A blower control board on the blower module monitors and controls the operation of the variable-speed blower. The variable-speed feature provides quieter operation by allowing the blower to operate at less than maximum speed when doing so provides adequate cooling air to maintain an acceptable operating temperature inside the chassis.
Temperature sensors on the chassis interface and Route Switch Processor (RSP2 or RSP4) monitor the internal air temperature. When the ambient air temperature is within the normal operating range, the blower operates at the slowest speed, which is 55 percent of the maximum speed.
If the temperature inside the chassis exceeds the normal range, the blower control board increases the blower speed to provide additional cooling air to the internal components. If the temperature continues to rise, the blower control board linearly increases the blower speed until the blower reaches full speed (100 percent). If the internal temperature exceeds the specified threshold, the system environmental monitor shuts down all internal power to prevent equipment damage from excessive heat.
If the system detects that the blower has failed, it will display a warning message on the console screen. If the condition is not corrected within two minutes, the entire system will shut down to avoid an overtemperature condition and shutdown.
The blower operates at 55 percent of capacity when possible and be should able to maintain an acceptable operating temperature inside the chassis. If the temperature exceeds 23° C, the blower speed increases linearly until it reaches 100 percent. Although the blower supports quieter operation under normal conditions (approximately 62 dBa), the noise level when the blower is operating at 100-percent capacity is approximately 70 dBa. Therefore, the Cisco 7513 and Cisco 7576 routers are best suited for unattended or computer room use.
The router requires a dry, clean, well-ventilated, and air-conditioned environment. The internal blower pulls ambient air through the chassis to cool the internal components. To allow sufficient airflow, maintain a minimum of two inches of clearance at both the inlet and exhaust openings on the chassis. If the airflow is blocked or restricted, or if the inlet air is too warm, an overtemperature condition can occur. Under extreme conditions, the environmental monitor will shut down the power to protect the system components.
To help maintain normal operation and avoid unnecessary maintenance, plan your site configuration and prepare your site before installation. After installation, make sure that the site maintains an ambient temperature of 32 through 104° F (0 through 40° C), and keep the area around the chassis as free from dust as is practical.
If the temperature of the room air drawn into the chassis is higher than desirable, the air temperature inside the chassis may also be too high. This condition can occur when the wiring closet or rack in which the chassis is mounted is not ventilated properly, when the exhaust of one device is placed so it enters the air inlet vent of the chassis, or when the chassis is the top unit in an unventilated rack. Any of these conditions can inhibit air flow and create an overtemperature condition.
Because the inlet air flows into one part of the chassis and out another, other devices can be rack mounted with little or no clearance above and below the chassis. However, when mounting a router in a rack with other equipment, or when placing it on a table with other equipment located close by, ensure that the exhaust from other equipment does not blow into the inlet of the chassis. The inlet air is drawn in and exhausted as shown in Figure 4.
Table 1 lists the operating and nonoperating environmental site requirements for the Cisco 7513 and Cisco 7576. To maintain normal operation and ensure high system availability, maintain an ambient temperature and clean power at your site. The following ranges are those within which the router will continue to operate; however, a measurement that is approaching the minimum or maximum of a range indicates a potential problem. You can maintain normal operation by anticipating and correcting environmental anomalies before they approach the maximum operating range.
| Specifications | Minimum | Maximum |
|---|---|---|
Temperature, ambient operating | 32° F (0° C) | 104° F (40° C) |
Temperature, ambient nonoperating and storage | -4° F (-20° C) | 149° F (65° C) |
Humidity, ambient (noncondensing) operating | 10% | 90% |
Humidity, ambient (noncondensing) nonoperating and storage | 5% | 95% |
Altitude, operating and nonoperating | Sea level | 10,000in (3050m) |
Vibration, operating | 5-200 Hz, 0.5 g (1 oct./min.) | - |
Vibration, nonoperating | 5-200 Hz, 1 g (1 oct./min.) 200-500 Hz, 2 g (1 oct./min.) | - |
When the system power is on, the blower must be operational. If the system detects that the blower has failed or is failing, it will display a warning message on the console screen.
If the condition is not corrected within two minutes, the entire system will shutdown to avoid an overtemperature condition. The system uses a Hall Effect signal to monitor the blower.
The current to the blower and the magnetic field generated by the blower's rotation generates a voltage, which the system monitors to determine whether or not the blower is operating. If the monitored voltage signal drops below a specified value, the system assumes a blower failure and initiates a shutdown.
In the following example, the system has detected an out-of-tolerance fan, which it interprets as a fan failure. The failure message is displayed for two minutes before the system shuts down.
%ENVM-2-FAN: Blower has failed, shutdown in 2 minutes
If the system does shut down because of a blower failure, the system will display the following message on the console screen and in the show environment display when the system restarts:
Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown
Before you begin replacing the blower, review the safety guidelines in this section to avoid injuring yourself or damaging the equipment. This section also lists the tools and parts you need to perform this procedure.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each warning statement.
| 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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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. 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.
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. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).
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. 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.
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. 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.
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. 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.
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 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.
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. 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.
¡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. 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.
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. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
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.
Follow these basic guidelines when working with any electrical equipment:
In addition, use the guidelines that follow when working with any equipment that is connected to telephone wiring or other network cabling:
Electrostatic discharge (ESD) damage, which can occur when electronic boards or components are handled improperly, can result in complete or intermittent failures.
Following are guidelines for preventing ESD damage:
 | Warning For safety, periodically check the resistance value of the antistatic strap. The measurement should be between 1 and 10 megohms. |
You need the following tools to install or replace a blower module:
If you determined that the blower or its control board has failed, you need to replace the blower module assembly. If you determined that the LED board inside the blower module assembly has failed, you need to replace the blower module assembly. The LED and blower control boards inside the blower module assembly are not separately replacable.
When viewing the chassis from the interface processor end, the blower module is located above the card cage. (See Figure 5.) Two slotted captive screws hold the blower module in place.
| Warning It is not necessary to turn off system power before removing the blower module; however, when the power is on and the blower module is removed, high current is exposed on the blower module power connector at the backplane. |
To replace the blower module, follow these steps:
Step 1 Locate the blower module, which is above the card cage on the noninterface processor end of the chassis. (See Figure 5.)
Step 2 Use the flat-blade screwdriver to loosen the captive screws that fasten each end of the blower module. (See Figure 5.)
| Warning Although the system should not be operating when you remove the blower module, it is not necessary to turn off system power before removing the blower module. However, with the system power on and the blower module removed, high current is exposed on the blower module power connector at the backplane; do not insert conductive items into the empty blower module opening. After an operating blower module is removed, the blower impeller blades will continue to spin for approximately two minutes; do not insert anything into the module's vent holes while the impeller is spinning. |
Step 3 Grasp the handle on the front of the module and slowly pull the blower module straight out of the chassis. (See Figure 5.)
Step 4 Place the removed blower module in an antistatic bag for storage or return to the factory.
 | Caution With the chassis power on and the blower module removed, no cooling air is circulating through the system. Replace the blower module before the system overheats. The system will shut down approximately two minutes after reaching the shutdown temperature threshold. |
Step 5 Hold the handle of the new module with either your right or left hand (as long as you use both hands to handle the module) and with the intake vents on the blower module facing down and the "Insert This Side Up" label facing up, insert the new blower module into the chassis. Keep the module as straight as possible as you guide it into the chassis.
Step 6 When the blower is all the way into the chassis opening, tighten the captive installation screws on the front of the blower module.
This completes the blower module removal and replacement procedure.
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Posted: Tue Oct 15 08:19:47 PDT 2002
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