General Description
An Input Fuse Holder is incorporated into the AC Input Power Connector assembly. It holds two input fuses. Refer to Section 3 for Troubleshooting information, Section 4 for Removal Replacement, and the Reference Information appendix for fuse size.
Power Supply(s)
The chassis has bays for two power supplies. When there is only one supply, it can operate from either bay and the unused bay is covered with a plate.
The fan on a Power Supply also furnishes cooling for the Switch chassis. A Power Supply fan draws air from the front of the chassis and expels it from the back of the chassis. One Power Supply with its cooling fan is sufficient to operate the Switch.
When there are two Power Supplies, they each become “hot pluggable”. That is, either supply may be removed while the Switch is operating. As long as one good supply remains in operation, the Switch will operate properly. Refer to Section 3 for troubleshooting procedures and Section 4 for Removal/Replacement procedures.
The Power Supply(s) operate independently of the Power Button on the front of the chassis. The supply(s) fan(s) starts to turn and the supply(s) start to produce logic voltages as soon as the chassis is connected to AC power. These logic voltages may, or may not, be enabled out of the power supply into the Switch logic. That depends on the position of the Power Button on the front of the chassis.
Each Power Supply has two lights that indicate its status. Refer to Figure
Power Good Light (Green)
The Power Good Light is ON when its supply is producing logic voltages within their proper voltage ranges and the Power Button is depressed (ON). The light is Off when its supply is not producing proper logic voltages or the Power Button is out (OFF). The Power Button on the front of the chassis must be in the ON position in order to enable the logic voltages into the Switch logic.
Overheat Light (Red)
The Overheat Light is normally OFF. When the power supply senses an overheat condition (airflow blocked or fan stopped) it turns the Overheat Light On and disables its logic voltages. This will turn its own Power On Light OFF and, if it was the only power supply in the Switch, it would power down the Switch. If there was another power supply installed in the Switch, the Power Supply Fail LED on the Switch’s front panel would turn ON and the Switch would continue to operate with the other power supply.
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Installer's/User's Manual | ||
