Installing and Removing a Power Supply
2-6 Installation
Power Supply Planning
AsshowninTable 2‐1,whentwopowersuppliesareinstalledandpowerredundancy(thedefault
switchsetting)has notbeendisabledthroughtheCLI,thepowersuppliessharetheloadequally
andprovidepowerredundancy.Ifonepowersupplyfailsorisremoved(hotswapped)forany
reason,the
otherpowersupplytakesuptheload.Powerredundancyremainsineffectaslongas
theloaddoesnotexceedthepowerasstatedintheRedundancycolumn.
Supported Power Configurations
ThefollowingpowerconfigurationsaresupportedontheG3:
•Non‐redundant(additive)
– 400Watts
– 800Watts(2X400)
– 1200Watts
– 1600Watts(1200+400)
– 2400Watts(1200X2)
•Redundant
– 400Watt(2X400)
– 400Watt(400+1200)
– 1200Watt(2X1200)
Power Distribution Upon Power Removal or Addition
Power Supply Removal
Whenapowersupplyisremoved,theG3respondstothedecreaseinavailablepowerby:
1. Detectingthepowersupplyremovalandrecalculatingavailablepower.
2. Subtractingthepowercapacityforitsbasesystemandallinstalledmodulesfromavailable
power.
3. DistributingremainingpowerequallyacrossinstalledPoEcontrollersbyreprogramming
maximumpower
ineachcontroller.
4. DroppingsupporttoPoEdevicesasnecessarytostaywithintheprogrammedmaximum
power.
Table 2-1 Power Distribution According to Number of Installed Power Supplies
Power
Supplies
Redundancy
Hot
Swappable
Power Sharing
1 No No Maximum power 1200
2 Yes, if power demand is less than
the capacity of one power
supply.
1
1. If power requirements exceed this capacity, power redundancy is no longer supported. Removing a power
supply under this condition will cause the remaining power supplies to go into over-current protection and shut
down the power system.
Yes The total load is shared by both power
supplies.
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