Magnum 6KQE Managed Edge Switch Installation and User Guide | 02/09 |
C3.0 |
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The 
connection terminals) so that power from an external source can only flow into the unit. This allows the unit to operate
whenever DC power is correctly
applied to either or both of the two inputs.
C4.0 FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN
a)The Switch unit can receive power from either input, “A” or “B”. The hub will normally draw its power from the DC source with the highest voltage at a given time.
b)The Switch unit will not allow power to flow from a higher voltage input to a lower voltage input, i.e. the two DC power sources are not mixed together by the hub.
c)When one correct DC input is present, the Switch will receive power if the other DC input is absent, or even if it is connected with reverse polarity or shorted or grounded.
d)Reverse polarity connections, if they should accidentally occur on either input, will not damage the Switch or power supply internally (nor will it blow the fuse in the internal power supply) because of the blocking action of the diodes. This is true even if one input connection is reversed while the Switch is operating from the other source.
e)The Switch will not receive power (and will not work) when both inputs are simultaneously absent or are both incorrectly connected.
Figure C5.0: DC Dual-Source, wiring connections with Dual-Source option.
Dual Source Terminal block
C5.0 INSTALLATION
This section describes the proper connection of the
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