GarrettCom 6K32 User Manual
Page 61
Magnum 6K32 Managed Switch Installation and User Guide (02/05)
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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 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 and 125VDC
power source leads to the -48 VDC, 24VDC and 125VDC power terminal block on the
Magnum 6K32s. (see figure at right).
In this picture, the -48VDC terminal block on the Magnum 6K32 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 6K32. The leads are identified as negative (-),
positive (+), and chassis ground (GND).
Figure B4.0: -48VDC Terminal Block on Magnum 6K32-48VDC
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 6K32 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 Magnum 6K32 Switch.
B4.1
UL Requirements for DC-powered units
1. Minimum 18AWG cable for connection to a Centralized DC power source.
2. Minimum 14AWG cable for connection to a earthing wiring.
3. Use only with Listed 10 A circuit breaker provided in building installation.
4. “Complies with FDA radiation performance standards, 21 CFR subchapter J.”
or equivalent.
5. Fastening torque of the lugs on the terminal block: 9 inch-pound max.
6. Centralized DC Power Source cable securement, use at least four cable ties to
secure the cable to the rac,k at least 4 inches apart, with the first one located
within 6 inches of the terminal block.
B5.0 OPERATION