NEBULA OPERATION 1
NEBULA INTRODUCTION
The Theatrelight Nebula is a general purpose 19 inch rack-mounting dimmer pack for use in TV Studios, Theatres, Concert
halls, or any venue requiring an intelligent and reliable dimmer installation. The Nebula design supersedes the original
Theatrelight Digital Dimmer. The new design uses the latest microprocessor and components chosen for reliability and long
MTBF (Mean Time Before Failure). The isolated DMX input presents only 1/10th standard loading, reducing the possibility of
DMX errors. Additionally, zero-crossover noise filters ensure correct triggering and immunity to mains interference even in the
most adverse environment. The wide input voltage and frequency range afforded by Theatrelight’s in-house designed switch-
mode power supply allows the Nebula to work on any voltage from 90 volts AC to 265 Volts AC, and on any frequency from 45
to 65 Hertz, making it suitable for use in any country. The Nebula is also fitted with an RS485 communication system for use
with other Nebulas, with remote keyplate lighting controllers, or as a control, reporting, and monitoring gateway. The Nebula is
available in a number of versions: 12, 6, and 3 channel models, using SCR, IGBT, or Sinewave dimming methods. A number
of different mains input and output terminations are available, and special socket versions can be made to customer order.
The Nebula software is available in a number of different software configurations according to application. A similar control
system and software is also used in the following Theatrelight products:
Meteor-
a wall mounting Stage or Environmental
dimmer, and
Quasar-
a 2u high rack-mounting Environmental dimmer pack for smaller installations.
NEBULA FEATURES
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Simple and easy to use menu system with large 4 line, 20 character auto dimming LCD display
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Each dimmer channel may be patched to any DMX address (including all on the same DMX address)
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Individual Minimum, Maximum, Off, Proportional, and Test level per dimmer
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Individual Soft-start Time and Dimmer Curve (including Non-Dim) setting per dimmer.
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All dimmer parameters held in non-volatile flash memory
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Temperature controlled, variable speed cooling fan for low acoustic noise and long life
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Protection by Thermal/Magnetic circuit breakers
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High immunity to mains interference and low DMX signal
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Isolated, floating DMX input, 1/10th standard RS-485 load
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Isolated, floating RS-485 control for reporting and building control applications, 1/10th standard RS-485 load
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