B) CONTROL ELECTRONICS MODULE
A) General
(1) The dimmer rack electronics shall be contained in one plug-in Control Electronics
Module (CEM3). Each control module shall plug into a dimming cabinet, with no
discrete wire connections. A simple user interface shall be provided for group
configuration, testing and diagnostics. The control module shall be UL/cUL Listed and
CE Marked.
(2) The control module shall be completely digital without employing any digital-to-analog
de-multiplexing schemes or analog ramping circuits.
B) Control Module Interface
(1) A backlit 7-button keypad and 2-line-by-20-character backlit LCD shall be provided for
configuration, preset control, status and error indication as well as diagnostics.
(2) The seven buttons shall be Accept, Back, Plus, Minus, Home and Test as well as
Reset.
(3) The front panel shall have four status LED indicators: a blue LED for power status and
three green LEDs for Network, DMX A, and DMX B status.
C) Control Signal and Communications
(1) The control module shall be provided with an Ethernet control signal input. This input
shall be fully configurable with a range of patching and priority programming
capabilities. The Ethernet signal shall supply seamless integration between the
dimmer racks and both the entertainment and architectural lighting control systems.
The Ethernet signal shall also enable remote configuration, playback, file storage and
monitoring features on a personal computer on the network.
(2) Two optically isolated DMX512 inputs shall also be provided, allowing overlapping or
separation of any control level. 2,500V of optical isolation shall be provided between
the DMX512 inputs and the electronics. Systems that do not have optical isolation on a
prewired factory plug-in device shall not be acceptable.
(3) A single DMX512 input may be configured as a DMX output. The DMX out shall be
capable of outputting DMX from data obtained from the Ethernet.
(4) The control module shall plug into an electronic backplane, with power, panic and
station wiring connections available as screw terminals. DMX connections shall be
available as either a screw terminal or a punch-down terminal. The Ethernet
connection shall be a standard Cat5 RJ45 connection. The backplane shall also retain
that specific rack’s configuration and preset data in non-volatile memory. When any
new control module is inserted, it shall automatically come on-line fully functional.
(5) Complete group configuration containing rack setups, preset and dimmer information
shall be stored in each control module. All data shall also be transferable to and from
library storage on a personal computer on a group or per-rack basis. The system shall
be capable of monitoring multiple racks on a single Ethernet connection.
D) Control Module Features
(1) The control module shall have a dimmer update rate better than 16ms (60HZ) or 20 ms
(50 Hz) average. Dimmer outputs shall exhibit no oscillating or hunting for levels.
Dimmers with the same choke type set to the same level shall output within ±1V of
each other, regardless of phase or input voltage.
(2) Dimmer output levels shall be regulated for incoming line voltages. The regulation shall
adjust for both RMS voltage changes and deformations in the incoming AC waveform.
The control module shall monitor and adjust each dimmer's output to maintain a
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