Q-Logic SB2A-16B Manuel D’Utilisation

2 – General Description

Power Supplies

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The power supplies convert standard 110 or 230 VAC to DC voltages for the 
various switch circuits. Each power supply has an AC power receptacle, an On/Off 
switch, and two status LEDs as shown in 

. After connecting a power 

supply to an AC voltage source and placing the power switch in the On position, 
the power supply is energized and DC voltage is delivered to the switch logic 
circuitry. Refer to 

 for information about replacing 

a power supply.

Each power supply is capable of providing all of the switch’s power needs. During 
normal operation, each power supply provides half of the demand. If one power 
supply goes offline, the second power supply steps up and provides the 
difference.

The power supplies are hot swappable and interchangeable. Hot swappable 
means that you can remove and replace one power supply while the switch is in 
operation without disrupting service.

Each power supply has two status LEDs: an Output Power LED (green) and an 
Over Temperature LED (amber):

„

The Output Power LED illuminates to indicate that the power supply is 
producing DC voltage at the proper levels.

„

The Over Temperature LED illuminates to indicate that the power supply is 
overheating. When a power supply overheats, the switch extinguishes the 
Output Power LED and shuts down the power supply. Refer to 

 for information about troubleshooting 

over temperature conditions.

AC Power 

Receptacle

Output Power LED

(Green)

Over Temperature LED

(Amber)

On/Off Switch