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Magnum DS8016 Dual-Speed Stackable Hubs Installation and User Guide (07/06)
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C4.0 FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN
a) The hub can receive power from either input, “A” or “B”. The hub will normally draw
its power from the DC source with the highest voltage (in the 36-70V range) at a given
time.
b) The hub 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 hub 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 hub 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 hub is operating from the other source.
e) The hub will not receive power (and will not work) when both inputs are simultaneously
absent or are both incorrectly connected.
f) This product shall be provided with a Listed fuse or circuit breaker, rated 5 A, in the
supply circuit when connected to a 48 V centralized dc source.
C5.0 INSTALLATION
This section describes the proper connection of the 48VDC dual source leads to the
48VDC power terminal block on the Magnum DS8016 hub (shown in Figure C4.0).
The 48VDC terminal block on the Magnum DS8016 is located on the right rear 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+), and the chassis “earth” or ground (GND).
Figure B5.0: 48V DC Dual-
Source, wiring connections to the External
Terminal Block on a Magnum DS8016
48VDC with Dual-Source option
The connection procedure is straightforward.
Simply connect the DC leads to the Magnum
hub power terminals, positive (+) and negative (-) screws. The use of Ground (GND) is
optional, as this terminal connects to the hub chassis. Ensure that each lead is securely
tightened.
GND
36-70VDC
A+ A- B- B+
36-70VDC
C5.1 UL Requireme nts
The following must be adhered to in order to conform to UL requirements:
1. Minimum 14 AWG cable for connection to a Centralized DC power source.
2. Fastening torque of the lugs on the terminal block: 9 inch pound max.
3. Centralized DC Power Source cable securement, use at least four cable ties to
secure the cable to the rack at least 4 inches apart with the first one located within
6 inches of the terminal block.
C6.0 OPERATION