1. The universal dimming and switching modules shall be the PWR
Series UNI20 as required by the circuit layout.
2. The modules shall employ one random-switching solid-state relay for
phase-forward dimming and one electro mechanical relay for switching. It shall include
user selectable circuitry to accommodate FDB type dimmable electronic fluorescent ballast.
The switching shall provide positive air-gap isolation for both the dimmed and switched
output.
3. The hard-fired solid-state relays shall incorporate a pair of silicon
controlled rectifiers (SCR) mounted in anti-parallel configuration, snubber network, gate
drive circuitry, and an opto-isolator in an industry standard 1.80" x 2.30"
package. Devices utilizing triacs or propriatary SCR packages shall not be acceptable.
4. The solid-state relays shall be UL and cUL recognized and rated for a nominal
line voltage of no less than 277VRMS and withstand peak voltages of minimum 600V. The
devices shall have a minimum continuous rating of 40A and shall withstand surge currents,
for no less than 16.6mS, of minimum 625A.
5. The modules shall employ single pole, single throw, normally open, dual
make/break (SPST-NO-DM/B) general-purpose electro-mechanical relays.
6. The relay air-gap mechanism shall meet or exceed the requirements of UL1472.
7. The modules shall incorporate toroidal chokes providing, with 100% of full
rated load, a rise time of at least 350microS. Rise time shall be measured from 10% to 90%
of the waveform amplitude at 90° conduction angle. Add-on modules shall be available to
increase rise time to at least 700microS.
8. The modules shall be convection cooled only. An aluminum heat-sink, that forms
the main structural member of the module, shall provide no less than 160 square inches of
unobstructed primary cooling surface. Systems utilizing fans or other means of forced
primary or supplementary cooling shall not be acceptable.
9. Overall efficiency shall be no less than 96%. Thermal emission at full rated
load shall not exceed 300Btu/hr.
10. Output waveform asymmetry and DC component shall not exceed 1% at full
nominal load.
11. The module load circuit surge and transient withstand capability shall meet
or exceed the minimum recommendations of ANSI C64.21-1991. Continuous breakdown voltage
between control terminals, load terminals, and ground shall be no less than 4000V.
12. Line and load terminals shall accept up to #8 AWG wire. Control wiring shall
be provided by a 24" harness factory terminated in a 4 position keyed plug-in header.
13. The modules shall be UL listed for continuous operation at 100% of their
rating per NEC 1999 Article 210-20-a. Systems failing to meet this requirement shall not
be acceptable.
14. The modules including their wiring, termination points, mounting hardware,
enclosure and controller shall be UL and cUL listed as a complete assembly and for
Canadian installations comply with CSA Standard C22.2 #14-M91. UL recognized or listed
devices alone shall not be acceptable unless documentation is submitted to verify that the
entire assembly, including the controller and enclosure, has been tested and evaluated by
a Nationally Recognized Testing Laboratory (NRTL) and found to meet all the
herein-mentioned standards and requirements.
15. The modules shall be UL and cUL listed for AC Lighting loads with the
following minimum rating at 40° C ambient temperature:
