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6.8
Control Unit
The Control Unit (CU) contains the termination points for all modules within the RCI-1550
system. It also contains all the user interfaces, signal conditioning and processing circuitry
required to satisfy the RCI/LMI functionality. The CU enclosure is a powder coated steel and
carries an environmental protection rating of IP 65 which is suitable for internal or external
mounting. All cable entries are via a gland plate mounted on the bottom of the enclosure.
Check bonding between enclosure and chassis. If
a good bond cannot be ensured through the
mounting bracket, then install earth strap. It is
a condition of installation that equipotential
bonding must be ensured between the display
enclosure and the Control Unit enclosure.
6.8.1
Power Supply (PS)
Also refer to drawings at the rear of this manual for this item.
The power supply is a 16W, triple output isolated power supply. The input connector has
three terminals for each of the supply positive (V+); and supply negative (V-), allowing for
looping if required.
The V+ is switched to the output connector via a single pole 5A relay only when the PS is
running. The output connector contains two sets of power/RS-485 connections, one being for
the display connection and the other for expansion modules. The front panel fuse protects
power for this output connector.
File : 1550-Telescopic-HRT.DOC
Issue Date: - 01/08/05
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