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Preliminary
Chassis Back
SANbox-16HA Fibre Channel Switch
1-24 General Description 59005-03 Rev. A Installer’s/User’s Manual
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
Diagnostics/Troubleshooting and Section 4 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 1-8 for
their location.
Back Panel Lights
Power Supply Good Light (Green)
The Power Supply Good Light is ON when its supply is producing logic voltages
within their proper voltage ranges and the Power Button is 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.
Over Temperature Light (Red)
The Over Temperature Light is normally OFF. When the power supply senses an
overheat condition (airflow blocked or fan stopped) it turns the Over Temperature
Light On and disables its logic voltages. This will turn its own Power Supply Good
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.
When the overheated power supply cools down, the power supply will attempt to
place itself back in service. If the cause for the overheating condition is still
present, the power supply will eventually overheat again and the shutdown process
will repeat. During the periods where both power supplies are operating, the Power
Supply Fail LED on the front of the chassis will turn OFF. The Power Supply Fail
LED will only be ON when one of the two power supplies is actually failing.