6
A) Filtering
(1) Dimmer modules shall include toroidal filters to reduce the rate of current rise time
resulting from switching the SCRs. The filter shall limit objectionable harmonics, reduce
lamp filament sing and limit radio frequency interference on line and load conductors.
Modules shall offer 350 or 500 uS. filter rise times. Rise time shall be measured at the
worst case slew rate (about 50 percent) from 10 to 90 percent of the output wave form
with the dimmer operating at full load.
(2) All dimmers shall maintain their published rise time and/or fall time regardless of duty
cycle or rack temperatures. Dimmers that derate due to increased dimmer temperature
caused by full load operation or high phase angles shall not be acceptable.
B) Performance
(1) Power efficiency for standard dimmers shall be at least 97 percent at full load with a
no-load loss of 3V RMS. The dimmer shall accept hot patching of a cold incandescent
load up to the full rated capacity of the dimmer.
C) Physical
(1) Dimmer modules shall be fully plug-in and factory wired. Dimmer modules shall consist
of a heavy duty, die-cast aluminum chassis with integral face panel. No tools shall be
required for module removal and insertion. All parts shall be properly treated, primed
and finished in fine-texture, scratch resistant, gray epoxy powder coat. With the
exception of the circuit breaker, the module shall contain no moving parts. Each
module shall be labeled with the manufacturer's name, catalog number and rating.
Modules constructed of molded plastic for structural support are not equivalent and are
not acceptable. Dimmer modules shall be UL Recognized.
12) LINEAR DIMMER BAR
A) General
(1) The dimmer bar shall be the SmartBar 2 as manufactured by Electronic Theatre
Controls, Inc., or equal. SmartBars shall be portable linear forward-phase (SCR)
dimmer bars that allow fixtures to be mounted on them. The SmartBars shall be
available with current ratings of maximum 10 Amps per output circuit for a maximum of
20 Amps per incoming phase of power.
(2) Installation requires attachment for suspension points, safety cables, local main power
via a flexible cable, and DMX signal input.
(3) SmartBars shall be UL Listed and cUL Approved, and shall be so labeled when
delivered.
U) Mechanical
1) The dimmer bar shall be a self-contained unit, suitable for portable or permanent
installation. It shall be constructed of aircraft quality powder coated aluminum.
2) All dimmer bars shall be convection cooled and shall operate without cooling fans
or filters.
3) The bar shall have integrated suspension points for fixtures and for mounting
hardware(c-clamps or stand adapters). It shall be supplied with five 4-1/2” long, ½”
bolts and appropriate hardware.
4) Integrated suspension points shall provide captive nylon bushings for ease of swivel
focus of fixtures after mounting bolts have been tightened.
5) The 2 circuit dimmer bar shall measure 3.0 x 2.0 x 40 inches and weigh no more
than 14 lbs. The 4 circuit dimmer bar shall measure 3.0 x 2.0 x 60 inches and weigh
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