Large Installations; Testing Dimmers With Dmx; Dimmer Profiles; What Is A Profile - ETC SMARTRACK User Manual

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5.7.4 Large installations

Where more than 512 dimmers are required, it will be necessary to use

two or more DMX512 lines. In this case, treat the DMX512 start address

numbering as a number within the DMX512 range (1–512) of each

DMX512 line, and number the rack mcbs with the actual circuit numbers.

For example, a rack starting with dimmer 721 might be labelled

721–756, but have a start address of 209 (dimmer 209 in DMX512

stream 2).

With DMX512 received and addresses set, check that each dimmer is

responding correctly to its DMX512 control signal by bringing up each

DMX512 output in turn from the console and checking the level indicator

LED (modular Smartracks only) and the actual dimmer output. For this there

is no real substitute for going round the installation with a known good

light and plugging it into each of the (tested) sockets in turn.

A dimmer profile is a table of dimmer output levels corresponding to DMX

input levels. Using different profiles allows different types of load to be

connected to the outputs of the Smartrack, and achieve consistent fade

results or safe non-dim operation.

Smartrack is shipped with the factory default IES Square Law profile set for

all dimmers, which results in linear light output in relation to DMX control

input, for most types of filament lamps. In most cases there will be no need

to alter this default setting.

The table overleaf shows Smartrack's range of dimmer profile settings,

which may be applied to all or individual dimmers:

Smartrack User Manual

page 37

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