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Magnum 4K8 Switches Installation and User Guide (10/04)
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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 24VDC and 125VDC solution are particularly useful in the Industrial
environment, where it is common for facilities to operate on 24VDC or 125VDC power.
The 125VDC solution is mainly used in Utilities Industries, such as Electric substation,
Electrical generating plant etc. Whereas 24VDC application is mainly in the Industrial
environment, such as chemical plants, paper mill, stone quarrying plant, wastewater
treatment Plant etc.
B4.0 INSTALLATION
This section describes the installation of the -48 VDC, 24VDC & 125VDC
power source leads to the -48 VDC, 24VDC & 125VDC power terminal block on the
Magnum Ks. (see figure at the right).
In this picture, the
-48VDC terminal block on the Magnum
4Ks is located on the rear of the unit and
is equipped with three (3) screw-down
lead posts. It is similar for 24VDC and
125VDC options on Magnum 4Ks. The
leads are identified as negative (-),
positive (+), and chassis ground (GND).
Figure B4.1: -48VDC Terminal Block on Magnum Ks-48VDC
The actual connection procedure is straightforward. Simply connect the leads
to the Magnum unit, beginning with ground. Ensure that each lead is securely tightened.
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.
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 “+”.
An ON-OFF manual switch is optional for DC power. This can be used to cut
off power connections and as a RESET for the 4K-Series Switch.
36-70VDC
_
+
GND
ON
OFF