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Magnum 6K16-Series Managed Fiber Switch Installation and User Guide (04/06)
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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 -48VDC, 24VDC and
125VDC dual source leads to the -48VDC, 24VDC & 125VDC power terminal block on
the Magnum 6Ks Switch (shown in Figure )
The -48VDC terminal block on the
Magnum 6K16-Series Switch, as shown in
Fig C5.0 is located on the left front of the
unit and is equipped with
five (5) screw-down lead
posts. The primary terminals are identified
as positive (A+), negative
(A-), and the secondary power terminals as
negative (B-), 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 6K16-Series unit has a floating ground,
so the user may elect to Ground either + or = terminal to suit the customer’s use.
Before connecting hot lines to the Terminal Block of –48VDC, 24VDC or 125VDC,
always use a digital voltmeter to measure the output voltage of the power supply and
determine the lead which is more “+ve potential”. The more “+ve” voltage lead from
48V or –48V supply must be connected to the post labeled “+”.
The connection procedure is straightforward. Simply connect the DC leads to
the Switch’s power terminals, positive (+) and negative (-) screws. The use of Ground
(GND) is optional; it connects to the Switch chassis. Ensure that each lead is securely
tightened.
The 24VDC & 125VDC terminal block on Magnum 6K16-Series’s is similar to
that described in the –48VDC information above.
DC terminal
block