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Product Number: AP-DC-PANEL =
This document describes how to install DC fuse panels in a Cisco AccessPath Integrated Access System. Use this document with the Cisco AccessPath Integrated Access System Hardware Installation and Configuration Guide and the Regulatory Compliance and Safety Information for the Cisco AccessPath Integrated Access System document that accompanied the Cisco AccessPath Integrated Access System.
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If an AccessPath system is equipped for DC power, the power is supplied to the various shelves through two DC fuse panels (see Figure 1), which are mounted above the Failsafe/Console Management Shelf at the top of the AccessPath rack. The DC fuse panels may be supplied with the AccessPath system, but may not be mounted in it.
The DC fuse panels allow you to connect the AccessPath system to a DC power source, using either single or multiple input feeds. Each side of an AccessPath system DC fuse panel can accept 60 to 80 amps of continuous input power at -48 volts DC. Separate circuit breakers are provided for each of the two input feeds. If multiple feeds are used, a common ground is required for safe operation.
The DC fuse panels distribute DC power from the primary input feed(s) to all internal power components in the AccessPath system. Individual GMT-style protection fuses are provided at the power supply level for component protection on each of the internal circuits.
DC fuse panel installation is described in detail in the sections that follow:
Follow these guidelines to ensure general safety:
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, may harm you. A warning symbol precedes each safety warning.
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.
| Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. |
| 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. |
| 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 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. |
| Warning Read the installation instructions before you connect the system to its power source. |
| 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. |
| 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. |
| Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
| Warning When installing the unit, the ground connection must always be made first and disconnected last. |
| 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. |
| Warning Only trained and qualified personnel should be allowed to install or replace this unit. |
| Warning A readily accessible two-pole disconnect device must be incorporated in the fixed wiring. |
| Warning Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. |
Follow these guidelines when working on equipment powered by electricity:
The following items are included with each DC fuse panel:
To install the DC fuse panels, you will also need the following tools and equipment (which are not included):
This section guides you through the mounting of the DC fuse panels in the AccessPath rack.
The location of the DC fuse panels is important for proper operation. If equipment is placed too close together, has inadequate ventilation, or is inaccessible, malfunctions and shutdowns can result and maintenance will be difficult. Plan for access to both the front and rear panels.
| Warning Only trained and qualified personnel should be allowed to install or replace this unit. |
| Warning Read the installation instructions before you connect the system to its power source. |
| Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. |
| 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 mount the DC fuse panels in the AccessPath rack, follow these steps:
Step 1 If necessary, attach the rack mounting brackets to the DC fuse panels using the 4 screws that come with the rack-mounting brackets (see Figure 2).
Step 2 After the rack-mounting brackets are secured to the DC fuse panels, mount them at the top of the AccessPath equipment rack above the Failsafe/Console Management Shelf. Using the screws that you provide, attach the DC fuse panels to the side rails of the equipment rack as shown in Figure 3.
This section describes the procedure for cabling the DC fuse panels after you mount them in the AccessPath rack.
The DC fuse panels accept two 60 to 80-amp, -48 VDC circuits of input power. Each panel can supply a total of 120 to 140 amps of steady-state output current.
| 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 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 connect the internal power supplies to the DC fuse panels:
Step 1 Ensure that the two main circuit breakers on each of the DC fuse panels are in the OFF position. The switches point away from each other in the OFF position.
 | Caution There are two sets of independent input DC power connectors and two separate circuit breakers on each DC fuse panel. Each of the two circuit breakers on a DC fuse panel is associated with only one side of the panel and one group of ten DC output connections. |
Step 2 Cut sets of wires (one red, one black) to the lengths specified in Step 6 through Step 12.
Step 3 Remove about a quarter of an inch (0.6 cm) of insulation from each end of the wire and tin both ends to ensure that it does not fray or cause a bad connection.
| 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. |
Step 4 Connect a spade-type terminal lug to one end of each wire, as necessary.
The wires to the Failsafe/Console Management Shelf and the Router Shelf (or shelves) do not require terminal lugs at the shelf end of the wires.
Step 5 Connect each shelf, in turn, as described in the following steps (see Figure 5).
| Caution The illustration shows the DC fuse panel terminal block. Install each wire from the designated DC fuse panel terminal to the designated shelf location (terminal) using 14 gauge wire. The proper wiring sequence is positive to positive (line to +) and negative to negative (neutral to -). Route all power wiring away from sharp edges and the interface cards on the access server shelves to avoid possible damage to the wires. |
For either the single or dual router configuration, wire the Failsafe/Console Management Shelf as follows:
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Failsafe/Console Management Shelf Positive terminal Negative terminal | Terminal A4 return Terminal A4 equip | Red wire 34 in. (86 cm) long Black wire 34 in. (86 cm) long |
For either the single or dual router configuration, wire the Switch Shelf as follows:
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Switch Shelf Power supply 1 positive terminal Power supply 1 negative terminal Power supply 2 positive terminal Power supply 2 negative terminal | Terminal A5 return Terminal A5 equip Terminal B4 return Terminal B4 equip | Red wire 94 in. (239 cm) long Black wire 94 in. (239 cm) long Red wire 110 in. (279 cm) long Black wire 110 in. (279 cm) long |
For either the single or dual router configuration, wire the first Router Shelf as follows. In the dual router configuration, the first Router Shelf is the lower of the two router shelves.
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Router Shelf 1 Power supply 1 positive terminal Power supply 1 negative terminal Power supply 2 positive terminal Power supply 2 negative terminal | Terminal A6 return Terminal A6 equip Terminal B5 return Terminal B5 equip | Red wire 79 in. (201 cm) long Black wire 79 in. (201 cm) long Red wire 91 in. (231 cm) long Black wire 91 in. (231 cm) long |
For the dual router configuration, wire the second Router Shelf as follows. In the dual router configuration, the second Router Shelf is the upper of the two router shelves.
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Router Shelf 2 Power supply 1 positive terminal Power supply 1 negative terminal Power supply 2 positive terminal Power supply 2 negative terminal | Terminal A7 return Terminal A7 equip Terminal B6 return Terminal B6 equip | Red wire 74 in. (188 cm) long Black wire 74 in. (188 cm) long Red wire 86 in. (218 cm) long Black wire 86 in. (218 cm) long |
For either the single or dual router configuration, wire the upper tier of Access Server Shelves (AS1 through AS6) as follows:
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Access Server Shelf 1 (AS1) Positive terminal Negative terminal | Terminal A1 return Terminal A1 equip | Red wire 36 in. (91 cm) long Black wire 36 in. (91 cm) long |
| Access Server Shelf 2 (AS2) Positive terminal Negative terminal | Terminal A2 return Terminal A2 equip | Red wire 39 in. (99 cm) long Black wire 39 in. (99 cm) long |
| Access Server Shelf 3 (AS3) Positive terminal Negative terminal | Terminal A3 return Terminal A3 equip | Red wire 46 in. (117 cm) long Black wire 46 in. (117 cm) long |
| Access Server Shelf 4 (AS4) Positive terminal Negative terminal | Terminal B1 return Terminal B1 equip | Red wire 55 in. (140 cm) long Black wire 55 in. (140 cm) long |
| Access Server Shelf 5 (AS5) Positive terminal Negative terminal | Terminal B2 return Terminal B2 equip | Red wire 63 in. (160 cm) long Black wire 63 in. (160 cm) long |
| Access Server Shelf 6 (AS6) Positive terminal Negative terminal | Terminal B3 return Terminal B3 equip | Red wire 68 in. (173 cm) long Black wire 68 in. (173 cm) long |
For either the single or dual router configuration, wire the first four lower tier Access Server Shelves (AS7 through AS10) as follows:
| Connect DC power to ... | from DC Fuse Panel 2... | using a 14 gauge ... |
|---|---|---|
| Access Server Shelf 7 (AS7) Positive terminal Negative terminal | Terminal A1 return Terminal A1 equip | Red wire 67 in. (170 cm) long Black wire 67 in. (170 cm) long |
| Access Server Shelf 8 (AS8) Positive terminal Negative terminal | Terminal A2 return Terminal A2 equip | Red wire 72 in. (183 cm) long Black wire 72 in. (183 cm) long |
| Access Server Shelf 9 (AS9) Positive terminal Negative terminal | Terminal A3 return Terminal A3 equip | Red wire 75 in. (191 cm) long Black wire 75 in. (191 cm) long |
| Access Server Shelf 10 (AS10) Positive terminal Negative terminal | Terminal A4 return Terminal A4 equip | Red wire 82 in. (208 cm) long Black wire 82 in. (208 cm) long |
For the single router configuration, wire the other two Access Server Shelves (AS11 and AS12), if present, as follows:
| Connect DC power to ... | from DC Fuse Panel 1 ... | using a 14 gauge ... |
|---|---|---|
| Access Server Shelf 11 (AS11) Positive terminal Negative terminal | Terminal A7 return Terminal A7 equip | Red wire 79 in. (201 cm) long Black wire 79 in. (201 cm) long |
| Access Server Shelf 12 (AS12) Positive terminal Negative terminal | Terminal B6 return Terminal B6 equip | Red wire 87 in. (221 cm) long Black wire 87 in. (221 cm) long |
To connect input power to the DC fuse panels, perform the following steps:
Step 1 Ensure that the AccessPath system is properly grounded. The DC fuse panels require that a frame ground be placed on the actual frame ground stud on the AccessPath rack. Use a green 6-gauge wire to connect one ground to the frame ground stud located at the top (or bottom) right rear corner of the AccessPath rack. The frame ground should be grounded at the main input to the AccessPath system.
| Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
| Warning When installing the unit, the ground connection must always be made first and disconnected last. |
| Warning Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. |
| Warning A readily accessible two-pole disconnect device must be incorporated in the fixed wiring. |
Step 2 Ensure that the main power circuit breakers are OFF at the building feed; lockouts are mandatory.
Step 3 Ensure that the two main circuit breakers on the DC fuse panel are in the OFF position. The switches point away from each other in the OFF position.
| Caution There are two sets of independent input DC power connectors and two separate circuit breakers. Each of the two circuit breakers on the DC fuse panel is associated with only one side of the panel and one group of ten DC output connections. |
Step 4 Cut two sets of 6-gauge wires (one white, one black) to the lengths necessary to reach the DC power source from the DC fuse panels when they are mounted in the AccessPath rack.
Step 5 Remove one-half of an inch (1.3 cm) of insulation from the end of each wire and solder the wires into the terminal connectors.
Step 6 Remove the DC input terminal connectors on the rear panel by first removing the plastic safety shield, then loosening both locking nuts on each connector.
Step 7 Solder the uninsulated end of each wire into the terminal connector so that no bare wire is exposed.
Step 8 Replace the terminals on the appropriate connectors on the DC fuse panels and tighten both locking nuts, as shown in Figure 6.
Step 9 Replace the plastic safety shield that covers the DC input connectors.
Step 10 After connecting two sets of input feed wires to each of the DC fuse panels, connect each set of 60 to 80-amp input feed connections to the DC power source. Ensure that the polarity of all connections is correct.
To install the correct fuses in the correct positions:
Step 1 Ensure that the two main circuit breakers on the DC fuse panel are in the OFF position. The switches point away from each other in the OFF position.
| Caution There are two sets of independent input DC power connectors and two separate circuit breakers. Each of the two circuit breakers on the DC fuse panel is associated with only one side of the panel and one group of ten DC output connections. |
Step 2 Install individual GMT-style fuses as listed in Table 1 (Single Router Configuration) or Table 2 (Dual Router Configuration) to protect the system at the component level.
| Caution When the fuse is correctly installed, the rating stamped on the fuse is upside down as shown in Figure 7. The fuse is keyed to prevent incorrect insertion; do not force it. |
Step 3 Verify that you installed GMT-style fuses of the correct rated current in the correct locations, as specified in either Table 1 (for Single Router Configurations) or Table 2 (for Dual Router Configurations).
Step 4 After installing all the fuses correctly, continue with the procedure "Powering On the System."
| AccessPath Shelf Location | DC Fuse Panel Location | Fuse Size |
|---|---|---|
| Access Server Shelf 1 | DC fuse panel 1 -- A1 | GMT 7.5 |
| Access Server Shelf 2 | DC fuse panel 1 -- A2 | GMT 7.5 |
| Access Server Shelf 3 | DC fuse panel 1 -- A3 | GMT 7.5 |
| Failsafe/Console Management Shelf | DC fuse panel 1 -- A4 | GMT 3 |
| Switch Shelf, Power Supply 1 | DC fuse panel 1 -- A5 | GMT 15 |
| Router Shelf 1, Power Supply 1 | DC fuse panel 1 -- A6 | GMT 15 |
| Access Server Shelf 11 | DC fuse panel 1 -- A7 | GMT 7.5 |
| Access Server Shelf 4 | DC fuse panel 1 -- B1 | GMT 7.5 |
| Access Server Shelf 5 | DC fuse panel 1 -- B2 | GMT 7.5 |
| Access Server Shelf 6 | DC fuse panel 1 -- B3 | GMT 7.5 |
| Switch Shelf, Power Supply 2 | DC fuse panel 1 -- B4 | GMT 15 |
| Router Shelf 1, Power Supply 2 | DC fuse panel 1 -- B5 | GMT 15 |
| Access Server Shelf 12 | DC fuse panel 1 -- B6 | GMT 7.5 |
| Access Server Shelf 7 | DC fuse panel 2-- A1 | GMT 7.5 |
| Access Server Shelf 8 | DC fuse panel 2 -- A2 | GMT 7.5 |
| Access Server Shelf 9 | DC fuse panel 2-- A3 | GMT 7.5 |
| Access Server Shelf 10 | DC fuse panel 2-- A4 | GMT 7.5 |
| AccessPath Shelf Location | DC Fuse Panel Location | Fuse Size |
|---|---|---|
| Access Server Shelf 1 | DC fuse panel 1 -- A1 | GMT 7.5 |
| Access Server Shelf 2 | DC fuse panel 1 -- A2 | GMT 7.5 |
| Access Server Shelf 3 | DC fuse panel 1 -- A3 | GMT 7.5 |
| Failsafe/Console Management Shelf | DC fuse panel 1 -- A4 | GMT 3 |
| Switch Shelf, Power Supply 1 | DC fuse panel 1 -- A5 | GMT 15 |
| Router Shelf 1, Power Supply 1 | DC fuse panel 1 -- A6 | GMT 15 |
| Router Shelf 2, Power Supply 1 | DC fuse panel 1 -- A7 | GMT 15 |
| Access Server Shelf 4 | DC fuse panel 1 -- B1 | GMT 7.5 |
| Access Server Shelf 5 | DC fuse panel 1 -- B2 | GMT 7.5 |
| Access Server Shelf 6 | DC fuse panel 1 -- B3 | GMT 7.5 |
| Switch Shelf, Power Supply 2 | DC fuse panel 1 -- B4 | GMT 15 |
| Router Shelf 1, Power Supply 2 | DC fuse panel 1 -- B5 | GMT 15 |
| Router Shelf 2, Power Supply 2 | DC fuse panel 1 -- B6 | GMT 15 |
| Access Server Shelf 7 | DC fuse panel 2-- A1 | GMT 7.5 |
| Access Server Shelf 8 | DC fuse panel 2 -- A2 | GMT 7.5 |
| Access Server Shelf 9 | DC fuse panel 2-- A3 | GMT 7.5 |
| Access Server Shelf 10 | DC fuse panel 2-- A4 | GMT 7.5 |
To power on the system, perform the following steps:
Step 1 Ensure that the main power circuit breakers are OFF at the building feed.
| Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. |
| 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. |
Step 2 Ensure that the two main circuit breakers on each of the DC fuse panels are in the OFF position. The switches point away from each other in the OFF position.
| Caution There are two sets of independent input power connectors and two separate circuit breakers. Each of the two circuit breakers on a DC fuse panel is associated with only one side of the panel and one group of 10 DC output connections. |
Step 3 Ensure that the main power feeds to the DC fuse panels are the correct polarity.
Step 4 Ensure that all connections from the DC fuse panels to the DC power supplies are the correct polarity.
Step 5 Turn on all DC power supplies at the component level.
Step 6 Go to the main circuit breakers off the input feeds and place the circuit breakers in the ON position.
| Warning After wiring the DC fuse panel, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position. |
| Caution Power is now present on the AccessPath rack. Hazardous conditions exist; use caution. |
Step 7 Turn on both of the DC fuse panel Main Power A circuit breakers.
Step 8 Turn on the DC fuse panel Main Power B circuit breaker on panel 1 only.
Step 9 Check the power supples and systems for power-on LED indications and airflow. Make this visual check inside the cabinet on each power supply and each system.
If a power system failure occurs, one or more DC fuses will open. In case of multiple failures, one or both of the main circuit breakers will trip, shutting down several units in the AccessPath system if not the entire system.
Step 1 Check the individual power supplies to determine if one (or more) has no LED power on indication or no airflow. If a fault condition occurs, remove all power by first turning off the four DC fuse panel circuit breakers, then turning off the main power circuit breakers.
When equipment installed in an AccessPath system rack fails because of overheating or power loss, try operating the equipment by itself. Power OFF other equipment in the rack (and in adjacent racks) to allow the failing unit maximum cooling air and clean power.
Step 2 Replace any defective fuse with a fuse of the correct rating.
| Warning Never change fuses with live power present. Lethal currents are present on and in the DC fuse panels. |
| Caution Never use a larger fuse than what is specified for the individual locations. Refer to Table 1 or Table 2 for the correct fuse size for each location. |
Step 3 Follow the power-on sequence of operations. See "Powering On the System," page 14.
Step 4 Verify that the proper LED power on indications are present and that airflow has resumed.
| Caution If there is still no power applied to the component in question (that is, if no LED power on indication is present and/or there is no airflow), a qualified service person should be called to replace the power supply component. |
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