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This chapter describes power and grounding requirements and instructions for connecting your Cisco MGC hardware to the network. This chapter contains the following sections:
Observe the following warnings before connecting and powering the Cisco MGC hardware.
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Warning Only trained and qualified personnel should be allowed to install or replace this equipment. |
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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. |
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Warning A voltage mismatch can cause equipment damage and may pose a fire hazard. If the voltage indicated on the label is different from the power outlet voltage, do not connect the chassis to that receptacle. |
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Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. |
The Sun Netra t 1400 is DC-powered. Refer to the Sun Netra t 1400/1405 Installation and User's Guide that shipped with the product for DC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun Netra t 1405 is AC-powered. Refer to the Sun Netra t 1400/1405 Installation and User's Guide that shipped with the product for AC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun Netra t 1120 is DC-powered. The unit has redundant power feeds. Refer to the
Sun Netra t 1120/1125 Installation and Basic Maintenance Guide that shipped with the product for DC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun Netra t 1125 is AC-powered. Refer to the Sun Netra t 1120/1125 Installation and Basic Maintenance Guide that shipped with the product for AC source site requirements, overcurrent protection, grounding instructions, and power cord installation instructions. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Sun E450 is AC-powered. Power cords are not supplied with the unit. Refer to the
Sun E450 Installation and Basic Maintenance Guide that shipped with the product for AC source site requirements, overcurrent protection, grounding instructions, and power cord installation. The Sun system must be connected to the power source and grounded per Sun's installation instructions.
The Cisco SLT can be AC-powered or DC-powered. Use the instructions in this section to connect the Cisco SLT.
Figure 5-1 shows the typical AC power supply for Cisco SLT. The DC power supplies look similar, but have a terminal block cover in place of the three-pronged connector for an AC power cord.
Figure 5-2 shows the location of the power supply in a Cisco SLT. In this case an AC power supply is shown as an example.
Table 5-1 lists AC power supply specifications, and Table 5-2 lists DC power supply specifications. These tables apply to all Cisco SLTs.
| Specification | Value |
|---|---|
Input voltage | -38 through -72 VDC |
Current rating | 5.0A maximum at 38 VDC, 2.8A maximum at 72 VDC |
Power dissipation | 72 W maximum |
Wire gauge for DC-input power connections | 14 AWG1 |
| 1AWG = American Wire Gauge. |
You need the following tools and equipment to remove and install power supplies in Cisco SLTs:
To gain access to the power supply of Cisco SLTs, you must first remove the chassis cover. Use the following procedure to remove the chassis cover:
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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. |
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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. |
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Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. |
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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 or the fuse that services the DC circuit, switch the circuit breaker to the OFF position or remove the fuse, and flag or designate the circuit as out of service until the work is complete in accordance with safety practices. |
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Warning Before performing any of the following procedures, ensure that you are wearing safety glasses. |
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Warning When installing the unit, the ground connection must always be made first and disconnected last. |
Step 2 Remove all network interface cables from the rear panel.
Step 3 If you have an AC-powered router, remove the power cord.
If you have a DC-powered router, follow these steps to remove the power cables:
a. Use a screwdriver to loosen the captive installation screws on the terminal block cover.
b. Lift and remove the terminal block cover.
c. Use a screwdriver to remove the three power leads from the terminal block, in the following order: negative, positive, then ground.
Step 4 If the router is rack- or wall-mounted, remove it from the rack or wall.
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Warning Before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. |
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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. |
Step 5 Place the router so that the front panel is facing you. Remove the screws located on top of the cover near the front edge.
Step 6 Slide the cover away from you until the metal tabs on the side edges separate from the chassis bottom, as shown in Figure 5-3.
Step 7 Lift the front edge of the cover until it clears the front of the chassis, as shown in Figure 5-4.
See the "Replacing the Cover" section when you are ready to replace the cover.
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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. |
This section describes how to remove the internal power supply. Although the AC power supply is shown in the illustrations that follow, the procedure is the same for removing both the AC and DC power supplies. See the "Wiring the DC Power Supply" section for specific DC power instructions.
Follow these steps to remove the power supply:
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Warning Wear safety glasses when performing the following operation. |
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Note If cable tie-wraps on the harness interfere with removing the connectors, cut the tie-wraps using the tie-wrap tensioning tool, being careful not to cut the power supply wires. |
Step 2 Remove the mounting screw that secures the power supply to the chassis. (See Figure 5-6.) Set aside this screw for later use.
Step 3 Slide the power supply forward slightly in the chassis. This disengages the built-in hooks that help secure the power supply to the chassis. (See Figure 5-7.)
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Note Place the removed screw and power supply in an antistatic bag. If cable tie-wraps on the harness interfere with removing the connectors, cut the tie-wraps, being careful not to cut into the power cables. |
Step 4 Lift the power supply out of the chassis.
Follow these steps to install a power supply in the chassis:
Step 2 Slide the power supply toward the rear of the chassis, engaging the hooks in the chassis.
Step 3 Replace the external rear mounting screw. (See Figure 5-6.)
Step 4 Insert the large power connector into the receptacle on the motherboard. (See Figure 5-5.)
Step 5 Using tie-wraps, fasten the power cables into a bundle that clears the edge of the chassis and keeps the cables away from the fan. Be sure that cables to the fans are routed under the hook in the bottom of the chassis.
After you finish replacing the power supply, follow these steps to replace the cover:
Step 2 Hold the cover so the tabs at the rear of the cover are aligned with the chassis bottom.
Step 3 Lower the front of the cover onto the chassis, making sure that the cover side tabs fit under the chassis side panels.
Step 4 Slide the cover toward the front, making sure that the cover tabs fit under the chassis back panel, and that the back panel tabs fit under the cover.
Step 5 Fasten the cover with the screws you set aside earlier.
Step 6 Reinstall the chassis on a rack, wall, desktop, or table.
Step 7 Reinstall network interface cables.
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Warning Read the installation instructions before you connect the system to its power source. |
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Warning This product relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC, 10A international) is used on the phase conductors (all current-carrying conductors). |
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Warning When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned tips. These terminations should be the appropriate size for the wires and should clamp both the insulation and conductor. |
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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, positive to positive (line to L), and negative to negative (neutral to N). Note that the ground wire should always be connected first and disconnected last. |
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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 |
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Warning Secure all power cabling when installing this unit to avoid disturbing field-wiring connections. |
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Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
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Note The installation must comply with the 1996 National Electric Code (NEC) and other applicable codes. |
Follow these steps to make final connections to the router:
Step 2 If you have an AC-powered router, plug the power cord into a 3-terminal, single-phase power source that provides power within the acceptable range (100 through 240 VAC, 50 through 60 Hz).
If you have a DC-powered router, rewire the DC-input power supply (38 through 72 VDC) to the terminal block using 14 AWG copper wires. The proper wiring sequence is ground to ground, positive to positive, and negative to negative. (See Figure 5-8.)
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Caution Do not overtorque the terminal block captive thumbscrew or terminal block contact screws. The recommended torque is 8.2 ± 0.4 inch-lb. |
Step 3 Turn on the power switch. The power LED on the front panel of the router should go on.
Step 4 Verify that the OK LED on the right side of the front panel goes on after a few seconds delay.
For systems running DC power only, use the following procedures.
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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. |
The DC power supply is intended for use in DC-operating environments. Table 5-3 lists the power supply specifications.
| Description | Design Specification |
|---|---|
Power (input) | 65W, -40 to -72 VDC |
Wire gauge for power connections | 14 AWG1 |
| 1AWG = American Wire Gauge. |
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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 or the fuse that services the DC circuit, switch the circuit breaker to the OFF position or remove the fuse and flag or designate the circuit as out of service until the work is complete in accordance with safety practices. |
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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, positive to positive (line to L), and negative to negative (neutral to N). Note that the ground wire should always be connected first and disconnected last. |
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Warning When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned tips. These terminations should be the appropriate size for the wires and should clamp both the insulation and conductor. |
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Warning After wiring the DC power supply, remove the flag from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the ON position. |
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Warning Secure all power cabling when installing this unit to avoid disturbing field-wiring connections. |
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Caution Do not overtorque the terminal block captive thumbscrew or terminal block contact screws. The recommended torque is 8.2 ± 0.4 inch-lb. |
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Note This product is intended for installation in restricted access areas and is approved for use with 14 AWG copper conductors only. The installation must comply with all applicable codes. |
Follow these steps to wire the terminal block:
Step 2 Wire the DC power supply to the terminal block, as shown in Figure 5-9.
Check the following items to help isolate problems with the power supply installation:
The Cisco Catalyst 5500 can be AC-powered or DC-powered. Use the procedures in the following section to power the Cisco Catalyst 5500 switch.
This section describes how to remove and install power supplies for the Cisco Catalyst 5500 switch. A flat-blade screwdriver is required to perform these procedures.
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Warning A design problem might affect a small percentage of Cisco Catalyst 5500 AC-input power supplies shipped as spares and AC-input power supplies shipped with chassis orders between December 1996 and December 1997. If you do not handle these power supplies with caution, you might experience a mild shock. We do not believe that the risk associated with this design problem is significant. We believe that the current design is safe when the power supply is handled correctly. Use the following procedure to safely remove AC-input power. |
The power supply manufacturer, with technical assistance from Cisco, has implemented a design change to correct the problem. In addition, we will provide replacement AC-input power supplies to any customer upon request at no cost to the customer. To arrange for a replacement, contact Cisco Systems Customer Service at 800 533-NETS (6787), 408 526-7208, or e-mail cs-rep@cisco.com. If you need further technical assistance, contact the Technical Assistance Center (TAC) at 800 533-24HR (2447) or e-mail tac@cisco.com.
Remove power from the AC-input power supply as follows:
Step 2 Turn off the power switch on the power supply you are removing.
Step 3 Remove the power cord from the power connection on the supply. Do not touch the metal prongs embedded in the power supply.
Step 4 Continue the power supply removal with Step 6 in the following procedure.
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Caution Do not mix AC-input and DC-input power supplies in the same switch. |
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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. |
Step 5 Disconnect the power cord from the power supply being removed.
Step 6 Use a flat-blade screwdriver to loosen and remove the captive installation screws.
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Caution Use both hands to remove and install power supplies. |
Step 7 Grasp the power supply handle with one hand. Place your other hand underneath to support the bottom of the supply, as shown in Figure 5-11.
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Warning Keep your hands and fingers out of the power supply bays. High current is present on the power backplane when the system is operating. |
Step 8 Pull the supply out of the bay and put it aside.
Step 9 If the power supply bay is to remain empty, install a blank power supply filler plate over the opening; secure it with the mounting screws.
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Caution Always install a filler plate over an empty power supply bay, not only to protect the inner chassis and connectors from dust or other contamination, but to prevent possible contact with the high current levels of those connectors when the chassis is turned on. |
Follow these steps to install an AC-input power supply:
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Caution Failure to turn off the power supply could result in equipment damage. |
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Caution Use both hands to install and remove power supplies. The Cisco Catalyst 5500 switch weighs 22 pounds (9.9 kg). |
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Warning Keep your hands and fingers out of the power supply bays. High current is present on the power backplane when the system is operating. |
Step 2 Grasp the power supply handle with one hand. Place your other hand underneath to support the bottom of the supply, as shown in Figure 5-11.
Step 3 Slide the power supply all the way into the power supply bay.
Step 4 Use a flat-blade screwdriver to tighten the captive installation screws.
Step 5 Prior to connecting the power supply to a power source, ensure that all site power and grounding requirements described in this chapter and in Chapter 2, "Preparing the Installation Site," have been met.
Step 6 Plug the power cord into the power supply.
Step 7 Connect the other end of the power cord to an AC-power input source.
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Note Each AC-input power supply operating at 120 VAC requires a dedicated 20A service and 20A plug and receptacle. It is not acceptable to power the Cisco Catalyst 5500 switch from a 15A line cord because of the safety ratings under which the Cisco Catalyst 5500 switch has been certified. |
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Caution In a system with dual power supplies, connect each power supply to a separate input source. In case of a power source failure, the second source will most likely still be available and can maintain maximum overcurrent protection for each power connection. |
Step 8 Turn the power switch to the ON position on the power supply.
Step 9 Verify power supply operation by checking that the power supply front panel LEDs are in the following states:
Step 10 Verify that the appropriate supervisor engine module PS1 and PS2 LEDs are green by entering the show system command to display the power supply and system status.
If the LEDs or show system command indicate a power or other system problem, see the
Cisco Catalyst 5000 Family Switches documentation set, refer to the documentation that shipped with the switch, or see the Documentation CD-ROM that shipped with the product.
Follow these steps to remove a DC-input power supply:
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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. |
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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. |
Step 2 Turn the power switch to the OFF (0) position on the power supply you are removing.
Step 3 Remove the terminal block cover by removing the two screws securing the terminal block cover and slide the cover straight off the terminal block.
Step 4 Disconnect the DC-input wires from the terminal block. Disconnect the ground wire last.
Step 5 Use a screwdriver to loosen and remove the captive screws on the power supply.
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Caution Use both hands to remove and install power supplies. |
Step 6 Grasp the power supply handle with one hand. Place your other hand underneath as you slowly pull the power supply out of the bay.
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Warning Keep hands and fingers out of the power supply bays. High voltage is present on the power backplane when the system is running. |
Step 7 If the bay is to remain empty, install a blank power supply filler plate (Cisco part number 700-00177-01) over the opening and secure it with the mounting screws. This protects the inner chassis from dust and prevents accidental contact with live voltage at the rear of the bay.
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Caution Always install a filler plate over an empty power supply bay, not only to protect the inner chassis and connectors from dust or other contamination, but to prevent possible contact with the high current levels of those connectors when the chassis is turned on. |
Step 8 Reinstall the power supply terminal block cover.
Follow these steps to install a DC-input power supply:
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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. |
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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. |
Step 2 Connect the switch to the CO ground through the CO ground connector shown in Figure 5-14. Remove the adhesive strip covering the CO ground connector on the switch.
Use the following guidelines when connecting the switch to the CO ground.
Step 3 Turn the power switch to the OFF (0) position on the power supply you are installing.
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Caution Use both hands to remove and install power supplies. |
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Warning Keep hands and fingers out of the power supply bays. High voltage is present on the power backplane when the system is running. |
Step 4 Grasp the power supply handle with one hand. Place your other hand underneath as you slowly insert the power supply into the bay.
Step 5 Use a screwdriver to tighten the captive screws on the power supply.
Step 6 Remove the terminal block cover by removing the two screws securing the terminal block cover, and slide the cover straight off the terminal block.
Step 7 Attach the appropriate lugs to the DC-input wires. Maximum width of the lugs is 0.300 inches
(7.6 millimeters). Suggested lugs are AMP 322985 or 52941. Use the DC-input wires (90° copper conductors) 8 AWG for the Cisco Catalyst 5500 switch.
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Note Cisco recommends that you use UL-listed crimp lugs and the appropriate crimp tool for installation. Two recommended crimp lugs are Thomas and Betts, No. 54104 or BUNDY, No.YA8C-L BOX and Thomas and Betts, Model TBM12, or TBM15 Hydraulic Heads. Crimp the lugs to the specifications given in the manufacturer's instructions furnished with the lug or crimp tool. |
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Caution When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned tips. These terminations should be the appropriate size for the wires and should clamp both the insulation and conductor. |
Step 8 Connect the DC-input wires to the terminal block.
Route the DC-input power cable through the conduit from your power source, through the conduit bracket on the power supply. Make a sufficient length of wire available to attach to the three terminal block connections.
Attach and tighten the conduit to the conduit bracket. How this conduit is attached depends on your site; its attachment is beyond the scope of this publication.
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Caution Figure 5-15 shows the DC power supply terminal block. Wire the DC power supply using the appropriate lugs at the wiring end, as illustrated, and apply appropriate antioxidant (that is NoOx) to the dissimilar metal contacts. The proper wiring sequence is ground to ground, positive to positive (line to L), and negative to negative (neutral to N). You should always connect the ground wire first and disconnect the ground wire last. |
Step 9 After ensuring that all wire connections are secure, reinstall the terminal block cover.
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Caution To prevent a short-circuit or shock hazard after wiring the DC-input power supply, reinstall the terminal block cover. |
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Caution In a system with dual power supplies, use the modular power cord to connect each power supply to a separate input line. In case of a line failure, the second source will most likely still be available and can maintain maximum overcurrent protection for each power connection. |
Step 10 Remove the tape from the circuit breaker switch handle and restore power by moving the circuit breaker switch handle to the ON position.
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Warning Read the installation instructions before you connect the system to its power source. |
Step 11 Turn the power switch to the ON position on the power supply.
Step 12 Verify power supply operation by checking that the power supply front panel LEDs are in the following states:
Step 13 Verify that the appropriate supervisor engine module PS1 and PS2 LEDs are green by entering the show system command to display the power supply and system status.
If the LEDs or show system command indicate a power or other system problem, see the
Cisco Catalyst 5000 Family documentation set, refer to the documentation that shipped with the switch, or see the Documentation CD-ROM that shipped with the product.
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Tips For a complete list of the related documentation that ships with this product, see the "Related Documentation" section. |
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Tips For a complete list of the related documentation that ships with this product, see the "Related Documentation" section. |
Both the ARU and A/B Switch use DC power. The power connectors for both units are identical, although they are wired with opposite polarity to each other. Pin 1 is minus on the ARU, and pin 1 is positive on the A/B Switch. (See Figure 5-16.)
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Warning The DC-powered A/B Switch relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 3A is used. |
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Warning The ARU relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 1 A is used. |
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Caution Ensure that the proper power cable is terminated to each unit. The power cables are marked ARU and A/B Switch. No damage occurs to the units if the wrong cable is terminated, but the A/B Switch does not power up if the wrong cable is attached. |
The Sun Netra t 100 uses DC power and the Sun Netra t 105 uses AC power. The power connectors for both units are described in Appendix A.
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Warning The DC-powered Sun Netra t 100 relies on the building's installation for short-circuit (overcurrent) protection. Ensure that a fuse or circuit breaker no larger than 3A is used. |
This section contains information about grounding your equipment.
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Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
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Note The hardware for this ground connection is not provided by Cisco. The installer is responsible for obtaining the necessary hardware and making the connection to earth ground. |
Earth ground connections are made in several ways depending upon the equipment. All AC-powered equipment is connected to earth ground over the ground conductor within the power cable. The DC-powered equipment provides earth ground connections using grounding studs or through the mounting hardware used to secure the equipment to the frame. The use of toothed lock washers is recommended for securing all equipment (AC or DC) to the equipment frame.
The ARU and A/B Switch require a secure earth ground connection between the chassis and the equipment frame. Make the ground connection by using a toothed lock washer underneath the head of one of the mounting screws used to secure the chassis to the frame or cabinet. The top-right mounting hole, when viewed from the front, is designated for the earth ground. This hole is denoted by the earth ground symbol (Figure 5-17). Although only one toothed lock washer is required to make a ground connection, Cisco recommends the use of toothed lock washers under all the mounting screws.
Posted: Thu Jun 8 05:16:43 PDT 2000
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