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This appendix contains information on how to replace the power supply for the Cisco AS5400 field-replaceable units. The appendix contains the following sections:
Note the following safety recommendations:
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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. |
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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. |
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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. |
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Warning Only trained and qualified service 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. |
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Caution Before opening the chassis, ensure that you have discharged all static electricity from your body and be sure that the power is OFF. |
You need the following tools and equipment:
You must open the access server chassis to gain access to its interior components.
Take these steps:
Step 2 If using a DC-powered unit, refer to Figure B-1 and complete steps a to d.
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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. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
a. Loosen the six locking screws for the negative, return, and ground connectors on the DC power supply terminal blocks.
b. Remove the -48 VDC wires from the terminal block negative connectors (-).
c. Remove the 48 VDC Return wires from the terminal block positive connectors (+).
d. Remove the safety ground (green wires) from the terminal block ground connectors.
Step 3 Remove all interface cables from the rear panel of the access server.
Step 4 Place the access server so that the front panel is facing you.
Step 5 Remove the four screws on the chassis cover, as shown in Figure B-2.
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Caution Do not connect the 48-VDC Return wire to chassis. A single point ground is recommended at the power distribution rack. |
Step 6 Gently pry the cover off with a flat-blade screwdriver. Lift the chassis cover upward, as shown in Figure B-3, and pull it away from the tabs on the rear of the chassis.
Step 7 Continue with the following section, "Removing the Old Power Supply."
This section describes how to remove the power supply. Note the following safety warnings before you remove the power supply:
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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. |
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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. |
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Warning Read the installation instructions before you connect the system to its power source. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
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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. |
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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. |
To remove the power supply:
Step 2 Remove the three mounting screws that secure the power supply to the chassis and set them aside. (See Figure B-4.)
Step 3 Turn the access server so that the front panel is facing you.
Step 4 Lift the air separator out of the chassis. (See Figure B-5.)
Step 5 Pull the fan closest to the power supply away from the sheet metal tabs. (See Figure B-6.)
Step 6 Lift the fan out of the chassis as shown in Figure B-7, and set the fan on top of the power supply.
Step 7 Depress the tab as shown in Figure B-8.
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Caution Do not attempt to remove the fan cables without first depressing the tab as shown in Figure B-8. You can damage the fan cables by applying stress if the connector is not removed properly. |
Step 8 Disconnect the fan cable as shown in Figure B-8, and set aside the fan.
Step 9 Remove the next fan and disconnect its cable.
Step 10 Remove the cables for the two remaining fans. You can disconnect these cables without removing the fans.
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Note There are three different lengths of 2 wire ± 12 VDC power cables. The two shortest cables go to the two fans that you removed in Step 6 through Step 8. The two longer cables go to the two remaining fans removed in Step 9 and this step. The remaining cable goes to the power connector on the backplane. These cables are color-coded. If you use an incorrect cable to connect a fan or the backplane, then you will be unable to make one of the other connections. To help with reconnecting the cables, write down which colored cable and the fan to which it connects. |
Step 11 Disconnect the power connectors from the backplane as shown in Figure B-9. First disconnect the 2-pin 12V connector, then disconnect the power connector's 4-jack harness.
Step 12 Disconnect the 6-pin connector from the motherboard.
Step 13 Slide the power supply toward the front panel to disengage the power supply hook from the chassis hook, as shown in Figure B-10. Then remove the power supply from the chassis.
A redundant power supply has two power cords to provide higher reliability and load balancing. Use the redundant power supply to:
To install the redundant power supply:
Step 2 Connect the 6-pin connector to the motherboard, as shown in Figure B-12. Note that, for clarity, the illustration does not show the fans in place or the fan cables.
Step 3 Reconnect the power connector's 4-jack harness, then reconnect the 2-pin 12V connector, as shown in Figure B-13.
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Caution Route the fan cables carefully to avoid pinching the cables near the bridge lance. See Figure B-14. |
Step 4 Route the fan cables exactly as shown in Figure B-14. Note that the two longest cables are connected to the two installed fans on the right. The connectors to these two fans will fit into the space between the second and third fans.
Step 5 Insert the second fan as shown in Figure B-14, making sure that the fan cable feeds to your left. Position the cables to the two installed fans so that they will fit under the first and second fans. Press the fan into place between the four sheet metal tabs.
Step 6 Reconnect the two 2-pin fan cables to the remaining fan, as shown in Figure B-15.
Step 7 Reinstall the remaining fan. Make sure you orient the fan so that the cables feed to the right (toward the second fan). Then route the cable completely under the fan before you reconnect it. This takes up the extra length of fan cable and keeps it out of the way.
When correctly assembled, the cables appear as shown in Figure B-16.
Step 8 Replace the air separator as shown in Figure B-17, holding all cables to the right of the separator as you slip it into the chassis.
Step 9 Turn the access server so that you face the rear panel, and then reinstall the three mounting screws (M3 mounting screws) as shown in Figure B-18.
Step 10 Replace the chassis cover using the procedures in the following section, "Replacing the Chassis Cover."
To replace the chassis cover:
Step 2 Hold the chassis cover over the chassis bottom, and align each of the cover tabs with the chassis tabs at the top rear of the chassis, as shown in Figure B-19.
Step 3 Lower the front of the top cover to close the chassis, and ensure the following:
When the chassis cover is properly assembled, no tabs are visible, as shown in Figure B-19.
Step 4 Secure the chassis cover with four screws.
Step 5 Reinstall the chassis on a rack, desktop, or table.
Step 6 Reinstall all interface cables.
Step 7 Reconnect the AC power cord. Or, if using a DC-powered unit, refer to Figure B-21, and then complete Steps a to d.
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Warning The illustration shows the DC power supply terminal block. Wire the DC power supply using the appropriate wire terminations at the wiring end, as illustrated. The proper wiring sequence is ground to ground, return to return, 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. |
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Caution Do not overtorque the terminal block contact screws. The recommended torque is 5.0 in.-lb (0.56 N-m). |
a. Insert the safety ground (green wires) into the terminal block ground connectors and tighten the locking screws. Ensure that no bare wire is exposed.
b. Insert the 48 VDC Return wires into the terminal block positive connectors (+) and tighten the locking screws. Ensure that no bare wire is exposed.
c. Insert the -48 VDC wires into the terminal block negative connectors (-) and tighten the locking screws. Ensure that no bare wire is exposed.
d. Make sure the power supply cords are secured to the cable strain-relief clamps on the DC power supply with cable ties.
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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. |
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Note You can order a Y-connector (CAB-AC-Y) to plug into both power connectors in the power supply. If you use this Y-connector, you remove the backup feature of this power supply by eliminating redundant operations and reducing reliability. Cisco highly recommends that you use both power cords whenever possible. |
Step 8 Power ON the access server.
The internal power supply fan should power on. If you are using a redundant power supply, the six green LEDs on the front of the power supply should light. If one LED is not lit, consult the appropriate redundant power supply software message to determine where the problem is located.
Posted: Wed Aug 23 12:57:21 PDT 2000
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