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5.8. 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.
5.8.1.
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.
The RS-485 signals are electrically isolated from the power and care must be take to ensure that
no short circuit is introduced between them, otherwise the unit's transient protection will be
compromised.
Transient protection has been included on all inputs. All internal power rails are current limited and
short circuit protected using re-settable fuses. These fuses will reset only when the fault has been
corrected and the power to the unit has been removed for at least 30 seconds before re-
application. There are no operator adjustments or settings on this board.
For complete wiring details refer to the installation drawings.
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