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Magnum 8000X Mixed-Media Fiber Hubs Installation and User Guide (05/ 02)
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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
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 8000X. (see figure at
the right).
Figure B4.1: -48VDC Terminal Block on Magnum 8000X -48VDC
In this picture, the -48VDC terminal block on the Magnum 8000X 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 8000X. 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 8000X 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 Hub.
B4.1 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.
36-70VDC
_
+
GND
ON
OFF