C5.0 Installation

CHASSIS

GND

- FUSE

SUPPLY

HUB

C3.0 DUAL-SOURCE OPTION, THEORY OF OPERATION

The Dual-Source DC power 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

Source power supply are designed for installations where a battery plant is the power source, and where two separate power sources are utilized in order to increase operational uptime and to simplify maintenance.

The functionality of the Magnum 4K-Series-48VDC, 24VDC & 125VDC Dual-Source Option units are identical to the standard AC-powered models. Refer to the main sections of this Installation and User Guide for a detailed description of the Magnum 4K-Series Switches.

FEATURES AND BENEFITS OF THE DUAL-SOURCE DESIGN

C4.0

GND

B- B+

A-

A+

Magnum 4K16 Switches Installation and User Guide

(12/05)

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.

This section describes the proper connection of the -48VDC, 24VDC & 125VDC dual source leads to the -48VDC, 24VDC and 125VDC power terminal block on the Magnum 4K-Series Switch (shown in Figure )

The -48VDC terminal block on the Magnum 4K-Series Switch is located on

the right rear of the unit and is equipped
with five (5) screw-down lead posts (see	A+ A-	B- B+
Fig C5.0). The primary terminals are
identified as positive (A+), negative (A-
), and the secondary power terminals as
negative (B-), positive(B+). The		36-70VDC
chassis “earth” or ground (GND), is a	36-70VDC	36-70VDC	GND
chassis “earth” or ground (GND), is a

threaded post with a #6 nut.

FigureC5.0: -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 4K unit has a floating ground, so the user may elect to Ground either + or = terminal to suit the customer’s use.

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