Magnum 6K25 Managed Fiber Switch | Installation and User Guide (04/06) |
The functionality of the Magnum 6K25 Switch
C3.0
option is designed using diodes inside of the chassis on each DC power input line. A diode is placed in each of the four input lines (behind the four
external power 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.
C5.0 INSTALLATION
This section describes the proper connection of the
The
is equipped with five (5) | A+ A- | B- B+ |
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lead posts. If it is the reverse model it |
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is located on the left rear. The primary |
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terminals are identified as positive |
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(A+), negative |
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power terminals as negative | GND | ||
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positive(B+). The chassis “earth” or ground (GND) is a threaded post with a #6 nut. The Dual Source terminal block for the 24VDC and 125VDC are similar.
Figure C5.0: -48VDC Dual-Source, wiring connections to the External Terminal Block on a Magnum 48VDC with Dual-Source option
Note: The GND should be hooked up first. The 6K25 unit has a floating ground, so the
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