Q-Logic MKII-BASE16 Manuel D’Utilisation

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.

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 1-4 for
their location.

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.

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.