A | PSU Terminal block (on the left side of the Power Supply Unit) |
B | TRXU Terminal block (on the rear side of each subrack inside the Transceiver Unit) |
C | Power supplies |
D | The cables from the TRXU Terminal block are connected to the Power Connector Panel on the rear side of the TRXU subrack. |
E | The power cables are run in steel conduits. |
F | This symbol means that the terminals are connected with a conductive rail. |
1 | Design, prepare and build the steel conduits between the three Power Supply Units and the Transceiver Unit. |
2 | Locate the DC power cable bundle from each Power Supply Unit. Observe the colour coding and the identification labels.
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3 | Pull each bundle through the relevant steel conduit. |
4 | Connect each cable in the bundles to the terminal blocks on the rear side of the Transceiver Unit. If the cables are too long, you may wish to cut them shorter.
Note
If you wish to keep long cables, do not coil them.
The current flowing in a cable generates heat. This causes the temperature of the conductors to rise until the heat lost balances the heat generated. If you coil a cable with high current, the heat dissipation suffers. This will result in a higher temperature at a given current. If the temperature gets too high the insulation on the cable softens and eventually melts.
If you coil a cable it will also generate electric noise. Any coil may act as an inductor or transformer, and it will have a certain resonant frequency. As the cable that makes up the coil passes a variable current, a varying magnetic field exists around the coil. Forces due to this magnetic field can cause vibration of the coil wires or the core of the coil.
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5 | Use a standard multimeter to verify that the correct connections are made, and that there are no short circuits. |