Q-Logic 64 Manuel D’Utilisation

2 – General Description
Power Supply Modules

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

. Each power supply 

module 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. After 
connecting a power supply to an AC voltage source, the power supply is 
energized and the DC voltages are delivered to the switch logic circuitry.

The power supplies are hot pluggable and interchangeable. Hot pluggable means 
that you can remove and replace one of the two operating power supplies while 
the switch is in operation without disrupting service. Refer to 

 for information about replacing a power supply.

Each power supply has two status LEDs: a Power Supply Fault LED (amber) and 
an Output Power LED (green). The Power Supply Fault LED illuminates to 
indicate a power supply fault. Possible power supply faults include high 
temperature, high or low input voltage, high or low output voltage, and high 
current. Refer to 

 for information about 

troubleshooting power supply fault conditions.

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

AC Power 

Receptacle

Output Power LED

(Green)

Power Supply 

Fault LED

(Amber)