5
E) DIMMER MODULES
A) General
(1) The dimmer modules shall be the Sensor dimmer modules as manufactured by
Electronic Theatre Controls, Inc., or equal. Sensor dimmer modules shall be designed
for dependable, economical service in theatrical and video applications.
B) Electrical
(1) Each dimmer module shall contain two single-pole circuit breakers, a solid-state
switching module, associated toroidal filters, and power and control connectors.
(2) Modules shall not have any protruding pins subject to physical damage when the
module is not installed.
(3) Modules shall be keyed so that dimmer modules of different capacity shall not be
interchangeable.
(4) Circuit breakers shall be fully magnetic so the trip current is not affected by ambient
temperature. Circuit breakers shall be rated for tungsten loads having an inrush rating
of no less than 20 times normal current. Circuit breakers shall be rated for 100 percent
switching duty applications. Dimmers that do not operate continuously at 100% load
shall not be acceptable.
C) SCR Assembly
(1) Each dimmer module shall use a solid state module (SSM) consisting of two silicon-
controlled rectifiers (SCRs) in an inverse parallel configuration, and all required gating
circuitry on the high voltage side of an integral, opto-coupled control voltage isolator.
Rectifiers, copper leads and a ceramic substrate shall be reflow soldered to an integral
heat sink for maximum heat dissipation. The SSM shall also contain a control LED, a
thermistor for temperature sensing, and silver-plated control and load contacts. The
entire SSM shall be sealed in a plastic housing requiring only a screwdriver to replace.
Dimmers employing triac power devices, pulse transformers, or other isolating devices
not providing at least 2,500V RMS isolation, shall not be acceptable. Dimmer modules
requiring disassembly, heat sink grease or additional tools for repair shall not be
acceptable.
(2) All electronic components (current/voltage sensors and indicators) shall be contained
in a single, field-replaceable housing. Modules requiring discrete wiring of electronic
components shall not be acceptable.
(3) SCR power switching devices shall have the following minimum ratings:
F) Module Size: G) 15A H) 20A
I) Single cycle:
Peak surge
current
J) 625A K) 625A
L) Half cycle:
12T
M) 1,620 N) 1,620
O) Transient
over voltage
P) 600V Q) 600V
R) Die size (in) S) .257 T) .257
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