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OPERATION GUIDE
2-450174-030A
WWW.VARI-LITE.COM
level A numerical value used to express the “brightness” of the load on a dimmer. Usually
shown as %.
patch Historically, the process of physically connecting circuits to dimmers. Now usually refers to
electronic assignment of dimmers to channels.
phase The three phases of the mains supply to which the dimmers are connected are identified
as Line 1, Line 2, Line 3 in 230v markets and as phase A, phase B, and phase C in 120v
markets.
power module A chassis containing one, two or four dimmer or contactors. This is sometimes referred
to as a “dimmer”. However, each C21/EC21 power module can have multiple dimmers or
contactors in it, so this manual distinguishes between dimmers (individual power control
circuits) and power modules (a collection of one or more power control circuits).
preset A pre-defined setup of intensities for a set of channels, stored in memory for later replay.
preset fade time See fade time
profile The relationship between a control level and the actual dimmer output. Also known as
“dimmer law” or “curve”.
rack number A number used to uniquely identify each dimmer rack in a multiple rack system. Rack
numbers are set from the front panel of the rack processor module, and are usually set by
the installation engineer.
room An area separately defined for purposes of architectural lighting control. This is usually
a room in the traditional sense (an indoor enclosed area) or a portion of a room that can
be partitioned o. Each room may be separately and simultaneously controlled by the
system.
RPH rack processor housing
RPM rack processor module
SSR solid state relay) A power control device used in Strand dimmers that contains two silicon
control rectifiers (SCRs), control circuitry, and optical isolation circuitry.
Vision.Net A digital architectural control system for use with C21/EC21 dimmer racks.
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