GarrettCom Magnum 3000 manual B4.0, Installation, This section describes

Magnum 3000 Stackable Hubs Installation and User Guide (07/06)

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 24VDC & 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 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.

B4.0	INSTALLATION	_ GND	+
	This section describes the

installation of the -48 VDC, 24VDC &	ON
125VDC power source leads to the -48	OFF

VDC, 24VDC & 125VDC power terminal block on the Magnum 3000 hubs. (see

figure at right). 36-70VDC

Figure B4.1: -48VDC Terminal Block on Magnum 3000 hubs

In this picture, the -48VDC terminal block on the Magnum 3000s 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 the Magnum 3000s. The leads are identified as negative (-), positive (+), and chassis ground (GND).

The actual connection procedure is very 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 3000s 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 in to cut off power connections and as a RESET for the Hub and / or SNMP Management Agent.

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