Dimming 3phase lighting circuits

[FONT=&quot]In a project I have to dim couple of 3phase lighting circuits of 1KVA each.
I was ready to offer 3 channels of 2A (L5504D2A) for every 3phase circuit but some colleagues of mine insist that this is wrong.[/FONT]
[FONT=&quot]They believe that I should install 3phase dimmer packs, which can be controlled either digitally using its DMX512 interface or analog by using the additional 8-pole DIN connector.[/FONT]
[FONT=&quot]I tried to find something relevant in this forum or clipsal's documents but I didn't find anything..[/FONT]

[FONT=&quot][/FONT]
[FONT=&quot]What is your opinion?
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Never on Sunday

I had took a decision to never begin a new tread on Sunday, because usually no ones reply. So I am coming back today.

PS: "Never on Sunday" is a well known old Greek movie. (http://en.wikipedia.org/wiki/Never_on_Sunday)

 

It should work

Without knowing your exact application, I don't see a problem with your proposal.
After all, it is really just a bunch of loads spread across 3 phases as opposed to a 3 phase device, eg. motor.(assuming in a 230/400V system they are 230V rated fixtures, treat like single phase loads with neutral to each)
Timing and synchronisation of dimming across all loads probably isn't critical or necessary.
Make sure each dimmer only has 1 phase connected to it.
Provide sufficient labelled protection/isolation facilities and you have a degree of flexibility in the case of failure of a dimmer or dimmer channel without losing all lights.

Having said this, I'm not an expert on lighting, more an industrial guy.

 

Use a universal dimmer as they can have poly phase supply on the one unit

L5504D2U
C-Bus DIN Rail Mounted 250V AC Universal Dimmer Range, DIN Rail mounted C-Bus dimmers with automatic load sensing. These units can be used with leading edge or trailing edge compatible low voltage electronic transformers, as well as incandescent lamps and low voltage lamps with iron-core transformers. Features 4 independent channels of 2.5A output per channel. Available with and without on-board 200mA C-Bus Power Supply and provide a software selectable Network Burden and C-Bus System Clock, 4 Channel, 2.5A per channel, 12M modules wide, 200mA C-Bus Power Supply.

May 2010 Trade Product Guide Page # 308

this dimmer would be a better option otherwise go toward architectural range
and one dimmer channel per phase. the load of 1KVA is that like 330watts per phase
or 1000watts per phase. sorry I am tired.

if each channel is on the same group address the dimming will appear uniform anyway - you will be unable to pick up any slight difference by eye.