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5. Installation
5.1. Physical connection
The MelCOMMS MINI has four screw holes on the base plate of the panel. These can be used to attach the unit in
place. Please secure the MelCOMMS MINI before powering the unit on.
5.2. Power supply
A double pole (Live and Neutral) 5A switch or circuit breaker must be provided in line with the supply to the
MelCOMMS MINI power supply and be in close proximity to it. It must be clearly marked as the disconnecting device
for the MelCOMMS MINI.
Ensure the mains cable supplying the power to the MelCOMMS MINI power supply is suitably rated for the intended
environment and current draw of the MelCOMMS MINI.
Warning:
Electrical work should be done by qualified electrical engineers / electrician in accordance with "Engineering
Standards for Electrical Installation" and supplied installation manuals. Dedicated circuits should also be
used. If the power circuit lacks capacity or has an installation failure, it may cause a risk of electric shock or
fire.
Caution:
Do not use anything other than the correct capacity breaker and fuse. Using fuse, wire or copper wire with too
large capacity may cause a risk of malfunction or fire.
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Be sure to take power from the special branch circuit
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Install the unit to prevent any of the control circuit cables coming into direct contact with power
cables
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Ensure that there is no slack on all wire connections
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Never connect the power cable to leads for the transmission cables. This will damage the
transmission cables
.
5.3. Modbus RS-485 connection
The MelCOMMS MINI has a 3-way screw terminal to provide Modbus RTU communication via RS-485 for up to 8x
MelcoBEMS MINI (A1M) adapters.
Caution:
All notes below should be carefully followed to ensure the Modbus network communicates correctly.
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For communication over RS-485 all 3 connections are needed. These are labelled A, B and GND.
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The RS-485 cable must be a shielded data cable. Mains flex or other unshielded cable must not be used. The
cable shield should be connected to GND at one end only.
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RS-485 has polarised data connections. It is crucial that all 'A's are connected together, all 'B's are connected
together and all 'GND's are connected together.
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The RS-485 cable must be a daisy-chained network. T-junctions (e.g. star network) are not permitted
−
Please see Procon MelcoBEMS MINI (A1M) Installation and Operation manual for more details.
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