GarrettCom 6K8 - Manual (Page 72)

Magnum 6K8-Series Industrial Field Switch Installation and User Guide (04/07)
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Figure C5.0: -48VDC, wiring connections to the External Terminal Block on a
Magnum 6K8 -48VDC
The –48VDC solution is particularly useful in the telecommunication industry, where it
is common for facilities to operate on -48VDC power. Such companies include regular
and wireless telephone service providers, Internet Service Providers (ISPs) and other
communication companies. In addition, many high availability equipment services,
such as broadcasters, publishers, newspaper operations, brokerage firms and other
facilities often use a battery backup system to maintain operations in the event of a power
failure. It is also frequently used for computer system backup, management and
operations monitoring equipment.
The 24V and 125VDC options are particularly useful in the Industrial environment,
where it is common for facilities to operate on 24VDC or 125VDC power. The 125VDC
options are mainly used in power utilities, such as electrical substations, electrical
generating plants, etc. The 24VDC applications are mainly in the Industrial environment,
such as factory floor, HVAC equipment, military equipment, etc. The 5VDC options are
mainly used for military or Industrial factory floor applications.
B4.0 6K8-SERIES, -48V, 24, 125 OR 5VDC INSTALLATION
This section describes the proper connection of the -48VDC leads (or
24VDC/125VDC/5VDC leads) to the DC power terminal block on the Magnum 6K8-
Series Switch. The DC terminal block on the Magnum 6K8-Series Managed Switch is
located on the left front of the unit and is equipped with three (3) screw-down lead posts.
The power terminals are identified as positive (+) and negative (-), and they are floating
inside the unit so that the user if desired may ground either. The chassis is “earth”
ground.
The connection procedure is straightforward. Simply insert the DC leads to the
Switch’s power terminals, positive (+) and negative (-) screws. Ensure that each lead is
securely tightened.
NOTE: Always use a voltmeter to measure the voltage of the incoming power supply
and figure out the +ve potential lead or -ve potential lead. The more +ve potential lead
will connect to the post-labeled “+ve” and the rest to the “-ve”. The GND can be
hooked up at the last.
When power is applied, the green PWR LED will illuminate.
Note: The GND should be hooked up first. The 6K8-Series unit has a floating ground,
so the user may elect to Ground either + or = terminal to suit the customer’s use.