Cisco 7505 Manuale di istruzioni per la sostituzione - Pagina 4

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Product Overview

Frequency

Power distribution

On the noninterface processor end of the power supply, two handles provide grip points for pulling

the power supply out of the chassis. (See Figure 2.) Two Phillips screws secure the power supply to

the chassis interior. Inside the power supply, two small fans draw cooling air through the power

supply interior. The air ﬂows in one side of the supply and out the other side, following the same

direction as the chassis cooling air.

The power supply delivers DC power to the internal components through a wiring harness that plugs

into a polarized receptacle to the noninterface processor side of the backplane. An aluminum cover

shields the harness and power connection. The backplane then distributes the DC voltages to the fan

tray, arbiter, and interface processor bus connectors.

The AC power receptacle, power on/off switch, and DC OK status LED are on the opposite

(interface processor) end of the power supply, and are accessible through cutouts in the chassis

below the processor slots. (See Figure 1.) A modular power cable connects the power supply to the

site power source. A cable retention clip on the power supply AC receptacle prevents the cable from

being pulled out accidentally. The rocker-type on/off switch turns the power supply on and starts the

system. Figure 3 shows a detail view of the interface processor end of the power supply.

Figure 3

On/off switch

AC receptacle

Cable retention

clip

The green DC OK LED indicates the status of the power supply and internal DC voltages. The DC

OK LED stays on when all of the following conditions are met:

•

If the AC source power or any of the internal DC voltages exceeds allowable tolerances, the DC OK

LED goes off and the system environmental monitor messages indicate the line that is out of

tolerance. Because the RP (which uses +5, +12, -12 VDC), and the fan tray (which uses +24 VDC)

are both required for operation, the system will probably shut down if any internal voltages reach an

out-of-tolerance state.

In addition to the environmental monitoring performed by the system software, the power supply

monitors its own temperature and internal voltages. If the supply detects an overvoltage or

overtemperature condition, it shuts down to avoid damage to the power supply or other system

components.

4 600W AC-Input Power Supply and Fan Tray Replacement Instructions

50 to 60 Hz

70A maximum @ +5 VDC, 15A maximum @ +12 VDC, 3A maximum @ –12

VDC, and 5A maximum @ +24 VDC

AC-Input Power Supply—Interface Processor End

Power supply is on and receiving 100 to 240 VAC, 50 to 60 Hz source power

Power supply is providing the +5, +12, -12, and +24 VDC to internal components

All internal DC voltages are within tolerance

DC OK LED